— Calculators
Free online calculators
424+ instant, browser-side calculators for everyday math: fuel costs, mortgages, BMI, sleep cycles, tips, recipes, and more.
- Transportation
Fuel Cost Calculator
Estimate the gas cost of any trip from distance, fuel economy, and the price per gallon.
- Transportation
Gas Fill-Up Cost Calculator
Figure out what it costs to top off your tank from its current level.
- Transportation
MPG Calculator
Compute real miles per gallon from your odometer and gallons pumped.
- Transportation
Speed Calculator
Calculate average speed from distance and time — supports hours and minutes.
- Transportation
Drive Time Calculator
Estimate driving time including planned rest stops.
- Transportation
Annual Commute Cost Calculator
Add up gas, insurance, and parking for the full year of commuting.
- Transportation
Road Trip Cost Calculator
Total a road trip budget: gas, hotels, and food, in one shot.
- Transportation
EV Charging Cost Calculator
See what charging your electric vehicle actually costs per month at home rates.
- Transportation
Tesla Charging Cost Calculator
Estimate weekly and yearly home charging cost for your Tesla model.
- Transportation
Car Depreciation Calculator
Estimate your car's current value after years and mileage.
- Transportation
Carpool Savings Calculator
See how much carpooling cuts your annual commute cost.
- Clothing & Sewing
Bra Size Calculator
Calculate your bra size from band and bust measurements.
- Clothing & Sewing
Weighted Blanket Calculator
Find your ideal weighted blanket weight using the 10% rule.
- Clothing & Sewing
Tablecloth Size Calculator
Find the right tablecloth size for any table and desired drop length.
- Clothing & Sewing
Circle Skirt Fabric Calculator
Compute fabric size and waist radius for a full circle skirt.
- Home Economics
Electricity Cost Calculator
Compute the monthly cost of running any appliance from wattage and use.
- Home Economics
Paint Coverage Calculator
Estimate how many gallons of paint your room needs.
- Home Economics
Flooring Calculator
Compute square footage and material needed including waste factor.
- Home Economics
Tile Calculator
Count tiles needed for any room with waste built in.
- Home Economics
Mortgage Calculator
Estimate monthly payments including principal, interest, taxes, and insurance.
- Home Economics
Solar Panel Savings Calculator
Estimate annual savings and payback period for a residential solar install.
- Home Economics
Air Conditioner BTU Calculator
Find the BTU rating you need to properly cool a room.
- Productivity
Tip Calculator
Compute the tip and per-person split for any bill.
- Productivity
Discount Calculator
Find the sale price and savings for any percent off.
- Productivity
Salary to Hourly Calculator
Convert an annual salary into an hourly rate.
- Productivity
Hourly to Salary Calculator
Convert an hourly wage to monthly and annual income.
- Productivity
ROI Calculator
Compute return on investment and annualized return.
- Productivity
Profit Margin Calculator
Compute gross profit and margin from revenue and cost.
- Productivity
Freelance Rate Calculator
Work out the hourly rate you need to charge to hit your income goal.
- Productivity
Pomodoro Calculator
Plan focus blocks and breaks using the 25/5 pomodoro technique.
- Productivity
Overtime Pay Calculator
Compute weekly pay with overtime at 1.5x past 40 hours.
- Productivity
Meeting Cost Calculator
Calculate what a meeting truly costs in payroll dollars.
- Time & Date
Age Calculator
Calculate exact age in years, months, and days from any date of birth.
- Time & Date
Days Until Christmas
How many days, hours, and minutes are left until Christmas Day?
- Time & Date
Sleep Cycle Calculator
Find optimal wake-up or bedtime based on 90-minute sleep cycles.
- Time & Date
Pregnancy Due Date Calculator
Estimate your due date and current pregnancy week from your last period.
- Time & Date
Business Days Calculator
Count working days (Mon–Fri) between any two dates.
- Leisure & Fun
Coin Flip
Flip a virtual coin — heads or tails, fair random.
- Leisure & Fun
Dice Roller
Roll any combination of D4, D6, D8, D10, D12, D20, or D100.
- Leisure & Fun
Random Number Generator
Generate random numbers in any range, with or without duplicates.
- Leisure & Fun
Yes or No Generator
Let randomness decide. A fair coin flip with words.
- Leisure & Fun
Zodiac Sign Calculator
Look up your Western astrological sign from your date of birth.
- Leisure & Fun
Love Compatibility Calculator
Just-for-fun compatibility score from two names.
- Hygiene
Shower Cost Calculator
Compute the yearly cost of your showers in water and energy.
- Hygiene
Sunscreen Calculator
How much sunscreen you actually need per day at the beach.
- Books & Reading
Reading Time Calculator
Estimate how long a book or article will take to read.
- Books & Reading
Audiobook Speed Calculator
See how much time you save listening at higher playback speeds.
- Miscellaneous
BMI Calculator
Body Mass Index from height and weight, with the standard category breakdown.
- Miscellaneous
Calorie Calculator (TDEE)
Estimate daily calorie needs via Mifflin-St Jeor BMR and activity multiplier.
- Miscellaneous
Water Intake Calculator
Estimate your daily water target adjusted for activity and climate.
- Miscellaneous
Steps to Miles Calculator
Convert step counts to miles using your stride length or height estimate.
- Miscellaneous
Percentage Calculator
Solve any percentage question: X% of Y, X is what % of Y, percent change.
- Miscellaneous
Square Footage Calculator
Compute area for rectangles, circles, and triangles in square feet.
- Miscellaneous
Roman Numeral Converter
Convert any number 1–3999 to a Roman numeral and back.
- Miscellaneous
Binary ↔ Decimal Converter
Convert between binary and decimal in either direction.
- Miscellaneous
Fraction Calculator
Add, subtract, multiply, or divide two fractions with auto-simplification.
- Miscellaneous
Currency Converter (Static)
Quick approximate currency conversion using static reference rates.
- Leisure & Fun
Pig Latin Translator
Translate any text into Pig Latin instantly.
- Leisure & Fun
Upside Down Text Generator
Flip your text upside down with Unicode tricks.
- Productivity
Word & Character Counter
Count words, characters, and reading time for any text.
- Transportation
Horsepower Calculator
Compute horsepower from engine torque and RPM using the standard SAE formula.
- Transportation
Tire Size Calculator
Decode a tire size into overall diameter, sidewall height, and circumference.
- Transportation
Compression Ratio Calculator
Engine static compression ratio from bore, stroke, deck, gasket, and chamber volumes.
- Transportation
Engine RPM Calculator
Compute engine RPM at a given speed from tire size, gear, and final drive.
- Transportation
0-60 mph Calculator
Estimate 0-60 mph time from horsepower, weight, and drivetrain.
- Transportation
Wheel Horsepower Calculator
Estimate WHP at the wheels after drivetrain losses.
- Transportation
Turbo Sizing Calculator
Estimate compressor airflow target for a turbo build.
- Transportation
Boost Horsepower Calculator
Estimate boosted HP from a naturally-aspirated baseline and boost pressure.
- Transportation
BSFC Calculator
Compute brake-specific fuel consumption from fuel flow and brake horsepower.
- Transportation
Wheel Offset Calculator
Compute wheel offset in mm from width and backspacing.
- Transportation
Speedometer Gear Calculator
Estimate the right driven-gear tooth count for accurate speedometer reading.
- Transportation
Boat Speed Calculator (Crouch)
Estimate top boat speed from HP and weight using Crouch's planing formula.
- Transportation
Nautical Mile Converter
Convert between nautical miles, statute miles, and kilometers.
- Transportation
Crosswind Component Calculator
Resolve runway wind into headwind and crosswind components.
- Transportation
Flight Radiation Calculator
Estimate cosmic-ray radiation dose for a flight.
- Transportation
GVWR Calculator
Total your truck's loaded weight and see which GVWR class it falls into.
- Transportation
Fuel Pump Sizing Calculator
Estimate fuel flow demand and per-injector load for a given HP target.
- Transportation
Traffic Density Calculator
Compute traffic density (vehicles per mile) from flow rate and speed.
- Transportation
Winch Size Calculator
Find the minimum winch capacity for your vehicle and terrain.
- Transportation
Parking Cost Calculator
Compare pay-as-you-go parking against a monthly pass.
- Transportation
Oil Change Cost Calculator
Compare DIY vs shop oil changes over a year of driving.
- Transportation
Car Insurance Estimator
Rough estimate of annual auto insurance premiums by age, vehicle, and coverage.
- Transportation
Bike Speed Calculator
Compute road-bike speed from cadence, gearing, and wheel size.
- Transportation
Train vs Drive Calculator
Compare driving cost against a train ticket, including the value of your time.
- Transportation
Travel Carbon Footprint Calculator
Estimate CO₂ emissions for any trip by mode and distance.
- Transportation
Uber vs Owning a Car Calculator
Compare monthly rideshare spend against the full cost of car ownership.
- Transportation
Airline Miles to Dollars Calculator
Estimate the cash value of your airline miles by program and redemption.
- Transportation
Miles Driven Per Year Calculator
Total annual driving miles from commuting, leisure, and road trips.
- Transportation
Engine Hours to Miles Calculator
Convert engine hours (on a marine or industrial engine) to equivalent automotive miles.
- Transportation
Distance Calculator (d = s × t)
Solve any of distance, speed, or time given the other two.
- Transportation
Toll Cost Calculator
Add up weekly, monthly, and annual toll spend — and the E-ZPass discount.
- Transportation
Flight Time Calculator
Estimate flight time from distance, cruise speed, and layover length.
- Transportation
Event Ticket Buy / Wait Optimizer
Should you buy event tickets now or wait? A simple heuristic by time-to-event and category.
- Clothing & Sewing
Shoe Size Conversion Calculator
Convert between US Men, US Women, UK, EU, and CM shoe sizes.
- Clothing & Sewing
Ring Size Converter
Convert between US, UK, EU, and inner diameter / circumference ring sizes.
- Clothing & Sewing
Dress Size Calculator
Find your US, UK, and EU dress size from bust, waist, and hip measurements.
- Clothing & Sewing
Jeans Size Calculator
Get your W × L jeans size from waist and inseam measurements.
- Clothing & Sewing
Hat Size Calculator
Find your hat size in numeric, fitted, and S/M/L formats from head circumference.
- Clothing & Sewing
Belt Size Calculator
Find the belt size to order from your pants waist or measured waist.
- Clothing & Sewing
Jacket Size Calculator
Find your jacket size and length from chest, height, and weight.
- Clothing & Sewing
Glove Size Calculator
Find your glove size from hand circumference at the knuckles.
- Clothing & Sewing
Sock Size Calculator
Convert shoe size to sock size (S/M/L/XL).
- Clothing & Sewing
T-Shirt Size Calculator
Get your t-shirt size from chest and waist measurements.
- Clothing & Sewing
Pants Size Calculator
Get your W × L pants size and a hip-to-waist ratio flag.
- Clothing & Sewing
Women's Clothing Size Converter
Convert women's top sizes across US, UK, EU, AU, IT, FR, and JP.
- Clothing & Sewing
US to UK Shoe Size Converter
Convert US shoe sizes to UK in either men's or women's sizing.
- Clothing & Sewing
UK to US Shoe Size Converter
Convert UK shoe sizes to US in either men's or women's sizing.
- Clothing & Sewing
Men's ↔ Women's Shoe Size Converter
Convert between men's and women's US shoe sizes (1.5-size offset).
- Clothing & Sewing
Kids Shoe Size Calculator
Convert measured foot length to US toddler/youth shoe size.
- Clothing & Sewing
Yarn Skein Calculator
How many skeins you need for a project, with a 10% safety buffer.
- Clothing & Sewing
Knitting Needle Size Converter
Convert knitting needle sizes between US, metric (mm), and old UK numbering.
- Clothing & Sewing
Quilt Binding Calculator
Compute strips and yardage for quilt binding.
- Clothing & Sewing
Half-Square Triangle Calculator
Cut size and square count for half-square triangles.
- Clothing & Sewing
Curtain Panel Calculator
Compute panel width and required fabric for window curtains.
- Clothing & Sewing
Elastic Length Calculator
Find elastic length for waistbands, cuffs, and necklines.
- Clothing & Sewing
Sewing Thread Calculator
Estimate thread consumed by a seam from length and stitch type.
- Clothing & Sewing
Shoelace Length Calculator
Find the right shoelace length for your shoe and lacing style.
- Clothing & Sewing
Lost Socks Calculator (Fun)
Estimate how many socks you've lost to the laundry over the years.
- Clothing & Sewing
Bikini Size Calculator
Get top and bottom bikini sizes from bra size and hip measurement.
- Home Economics
Wallpaper Calculator
Calculate rolls of wallpaper needed for a room, with waste and pattern repeat.
- Home Economics
Rent Affordability Calculator
Check if your target rent fits the 30% rule and standard DTI limits.
- Home Economics
Home Renovation Cost Estimator
Get a price range for kitchen, bath, basement, and other renovations.
- Home Economics
Moving Cost Calculator
Estimate the cost of a local, long-distance, or interstate move.
- Home Economics
Lawn Size Calculator
Compute lawn area in square feet and acres, plus seed and mowing estimates.
- Home Economics
Fence Cost Calculator
Estimate fence cost by perimeter, material, height, and gate count.
- Home Economics
Storage Unit Size Calculator
Pick the right storage unit size for your home and items.
- Home Economics
Christmas Tree Size Calculator
Find the right tree height and width for your room.
- Home Economics
Candle Burn Time Calculator
Estimate how many hours a candle will burn from size, wick count, and wax type.
- Home Economics
Insulation R-Value Calculator
Find recommended R-value and additional insulation needed by climate zone.
- Home Economics
Dumpster Size Calculator
Find the right roll-off dumpster size for your project.
- Home Economics
Internet Speed Cost Calculator
See $-per-Mbps and whether your plan suits your usage.
- Home Economics
Water Bill Calculator
Estimate monthly water usage and cost from household activity.
- Productivity
GPA Calculator
Calculate your weighted GPA across up to 6 courses, with letter grades and credit hours.
- Productivity
Weighted Grade Calculator
Compute your weighted course grade across up to 5 assignments.
- Productivity
Test Score Calculator
Compute percentage and letter grade from correct answers.
- Productivity
Work Hours Calculator
Daily, weekly, and monthly hours from start time, end time, and breaks.
- Productivity
Invoice Calculator
Subtotal, discount, tax, and total for up to 5 line items.
- Productivity
Break-Even Calculator
Units and revenue needed to cover fixed and variable costs.
- Productivity
Character Count Calculator
Characters, words, Twitter remaining, and SMS segments for any text.
- Productivity
Password Strength Checker
Score a password's strength locally based on length, variety, and patterns.
- Productivity
Font Size Converter
Convert between px, pt, em, rem, vw, and percent at a chosen base.
- Productivity
SAT Score Calculator
Approximate scaled SAT scores from raw section scores.
- Productivity
Numbers to Words Converter
Spell out any number up to a trillion in English.
- Productivity
Reverse Text Generator
Reverse a string character-by-character or word order.
- Productivity
NATO Phonetic Alphabet Converter
Spell any word using the NATO phonetic alphabet.
- Productivity
Study Time Calculator
Plan study hours per subject given an exam date and difficulty.
- Time & Date
Time Zone Converter
Convert a time between major world time zones.
- Time & Date
Retirement Date Calculator
Find your retirement date and time remaining based on age and country.
- Time & Date
Days Until Birthday
Count down to your next birthday from today's date.
- Time & Date
Work Days Calculator
Count working days between two dates, excluding US federal holidays.
- Time & Date
Bedtime Calculator
Find the best bedtimes to wake refreshed at a target time.
- Time & Date
Wake Up Time Calculator
Find the best wake times after a chosen bedtime.
- Time & Date
Countdown to Any Date
Count down the days, hours, and minutes to any future date.
- Time & Date
How Long Ago Calculator
Count years, months, days, weeks, and hours since a past date.
- Time & Date
Korean Age Calculator
Convert international age to traditional Korean age.
- Time & Date
Moon Phase Calculator
Find the moon phase, illumination, and next full moon for any date.
- Time & Date
Palindrome Date Finder
Find all palindrome dates in a given year.
- Time & Date
Leap Year Calculator
Check whether a year is a leap year, plus the next and last leap year.
- Time & Date
Time Duration Calculator
Difference between two times in hours, minutes, and seconds.
- Time & Date
Time to Decimal Converter
Convert HH:MM to a decimal hour value and back.
- Books & Reading
Audiobook Reading Pace Calculator
Plan your audiobook reading pace and yearly book goals.
- Leisure & Fun
TV Series Duration Calculator
Total runtime of a series across seasons, episodes, and lengths.
- Leisure & Fun
Binge Watching Calculator
Find your binge finish date based on daily watch time.
- Leisure & Fun
Hammock Hang Calculator
Hang point height, tree spacing, and strap length for a comfy hammock.
- Leisure & Fun
Helium Balloons to Lift Calculator
How many balloons does it take to lift a given weight?
- Leisure & Fun
Tent Size Calculator
Find the right tent capacity for your campers, gear, and style.
- Leisure & Fun
Numerology Calculator
Compute Life Path and Name numbers from your DOB and full name.
- Leisure & Fun
Lucky Number Generator
Generate lottery-style numbers seeded by your name and today's date.
- Leisure & Fun
Minecraft Day Calculator
Convert between real minutes and Minecraft in-game days.
- Leisure & Fun
Robux to USD Converter
Convert Robux to dollars (and back) at both direct buy and DevEx rates.
- Leisure & Fun
Poker Pre-Flop Odds Calculator
Rough heads-up and multi-way win probability by hole-card category.
- Leisure & Fun
Chess Elo Rating Calculator
Compute your new Elo after a single game vs an opponent.
- Miscellaneous
Protein Intake Calculator
Daily protein target by body weight, activity level, and goal.
- Miscellaneous
Macro Calculator
Daily calories, protein, fat, and carb targets from your body and goal.
- Miscellaneous
Body Fat Calculator (US Navy)
Estimate body fat percentage with the US Navy method.
- Miscellaneous
Ideal Weight Calculator
Compare your weight to Devine, Robinson, Miller, Hamwi, and healthy-BMI ranges.
- Miscellaneous
Running Pace Calculator
Find pace, time, or distance from any two of the three.
- Miscellaneous
Calories Burned Calculator
Calories burned for any activity using MET values.
- Miscellaneous
Diaper Cost & Quantity Calculator
Estimate diapers needed and cost by baby's age and brand.
- Miscellaneous
Cost of Having a Baby Calculator
Total estimated cost of delivery plus the first five years.
- Miscellaneous
Food Expiration Date Calculator
Estimate expected expiration date by item type.
- Miscellaneous
Battery Charge Time Calculator
Estimate hours to charge a battery from current to target level.
- Miscellaneous
Linear Inches Calculator (Luggage)
Total linear inches and airline carry-on / checked classification.
- Miscellaneous
Headphone Power Calculator
How much amp power your headphones need to hit a target SPL.
- Miscellaneous
Well Water Volume Calculator
Compute gallons of water in a well from diameter and depth.
- Miscellaneous
Garbage Bag Size Calculator
Find the right gallon-rated bag size for your trash can.
- Miscellaneous
Picture Frame Calculator
Compute mat, frame, and overall sizes for any artwork.
- Miscellaneous
Cubic Feet Calculator
Compute volume in cubic feet, yards, meters, and liters.
- Miscellaneous
Hex ↔ Decimal Converter
Convert between hexadecimal and decimal, with binary preview.
- Miscellaneous
Scientific Calculator
Evaluate math expressions with sin/cos/tan, log, sqrt, pi, e, and more.
- Productivity
Grade to GPA Calculator
Convert a letter grade or percentage into GPA points.
- Books & Reading
Reading Challenge Calculator
Track progress on a yearly reading goal and project your finish date.
- Books & Reading
How Long to Read a Book
Estimate hours to read a book at your pace.
- Books & Reading
Pages Per Hour Calculator
Measure your actual reading speed in pages per hour and words per minute.
- Books & Reading
Book Word Count Estimator
Typical word counts and page estimates by genre.
- Books & Reading
Goodreads Goal Calculator
Are you on pace for your Goodreads reading challenge?
- Books & Reading
Kindle Page Count Converter
Convert KOLL Kindle pages to print pages and words.
- Hygiene
Bath vs Shower Cost Calculator
Find out whether baths or showers are cheaper for you over a year.
- Hygiene
Hair Growth Calculator
Months to grow your hair to a target length.
- Hygiene
Beauty Products Cost Calculator
Annual cost of your beauty routine.
- Hygiene
Toothpaste Cost Calculator
Tubes per year and annual toothpaste cost.
- Hygiene
Hand Washing Time Reference
WHO-recommended hand-washing time and song references.
- Hygiene
Skincare Routine Cost Calculator
Roll up the per-day and per-year cost of your skincare routine.
- Hygiene
Perfume Longevity Calculator
How many weeks a perfume bottle will last at your usage.
- Hygiene
Hair Dye Cost Calculator
Annual hair color cost by method and frequency.
- Hygiene
Makeup Cost Calculator
Annual cost of your makeup kit.
- Hygiene
Soap Usage Calculator
How long a bar of soap lasts and the monthly cost.
- Hygiene
Face Mask Cost Calculator
Masks needed per month and annual cost by type.
- Leisure & Fun
How Rich Am I? Income Percentile
Where your income ranks against US (and rough global) distributions.
- Miscellaneous
Net Worth Calculator
Compute net worth from assets minus liabilities; compare to age peers.
- Leisure & Fun
IQ Score Estimator (Fun)
Rough IQ estimate from a raw test score — strictly informal.
- Leisure & Fun
Fantasy Football Points Calculator
Score a player line in standard, PPR, or half-PPR scoring.
- Leisure & Fun
Social Media Ban Impact Calculator
Estimate reach and revenue lost if your account is banned.
- Leisure & Fun
TikTok Time Alternatives Calculator
What you could do instead of scrolling TikTok for X minutes a day.
- Leisure & Fun
Social Media Time Alternatives Calculator
Yearly hours sunk into social media — and what they could become.
- Miscellaneous
Pixels ↔ Inches Calculator
Convert between pixels and physical inches at any PPI.
- Miscellaneous
Pounds + Ounces Calculator
Combine pounds and ounces into total weight in oz, grams, kg, and decimal lbs.
- Miscellaneous
Feet + Inches Calculator
Convert, add, or subtract feet-and-inches values.
- Miscellaneous
Height in Inches Calculator
Convert feet+inches height to inches, cm, and meters with a percentile note.
- Home Economics
Acreage Calculator
Compute area in acres from any shape's dimensions.
- Home Economics
Land Area Calculator (with South Asian units)
Land area in acres, hectares, bigha, katha, gaj, cent, and marla.
- Home Economics
Lot Size to Acres Converter
Convert lot size in square feet (or L×W) to acres and other units.
- Home Economics
Lot Size to Square Feet Converter
Convert acres or other area units to square feet and find the side of a square lot.
- Productivity
Scale Calculator
Solve scaled, real, or ratio given the other two.
- Miscellaneous
Download Time Calculator
How long a file will take to download at a given connection speed.
- Transportation
Torque ↔ HP Calculator
Compute horsepower from torque and RPM (or torque from HP and RPM).
- Home Economics
Watts to Amps Calculator
Compute amperage from wattage at a chosen voltage.
- Home Economics
Amps to Watts Calculator
Compute wattage from amperage at a chosen voltage.
- Home Economics
kWh ↔ kW Calculator
Convert between energy (kWh) and average power (kW) over a time period.
- Miscellaneous
dBm ↔ Watts Converter
Logarithmic conversion between dBm and watts.
- Miscellaneous
RMS Voltage to Watts Calculator
Compute RMS and peak power from RMS voltage and impedance.
- Miscellaneous
Joules to Volts Calculator
Convert energy and charge (or capacitance) into voltage.
- Miscellaneous
Barometric Pressure Converter
Pressure converted across all weather units with a forecast hint.
- Miscellaneous
PPM Calculator
Parts-per-million across PPM, PPB, ppt, percent, and mg/L.
- Miscellaneous
Hardness Conversion Calculator
Convert between Rockwell C, Rockwell B, Brinell, Vickers, and Shore D.
- Miscellaneous
Ratio Calculator
Simplify, scale, percentage-ize, or split a ratio.
- Miscellaneous
Imperial to Metric Converter Hub
One-stop imperial→metric conversion across length, weight, volume, temperature, speed.
- Miscellaneous
Metric to Imperial Converter Hub
Convert metric to imperial across length, weight, volume, temperature, and speed.
- Miscellaneous
Dimensional Analysis Tool
Educational unit-conversion chain across length, weight, volume, speed, temperature.
- Education
ACT Score Calculator
Convert ACT raw section scores to scaled 1–36 scores and a composite.
- Education
College GPA Calculator
Compute term and cumulative GPA on the 4.0 scale.
- Education
Final Grade Calculator
Find the score you need on the final exam to reach your target grade.
- Education
Grade Curve Calculator
Apply square-root, flat-point, or scale-to-100 curves to a test score.
- Education
Graduation Year Calculator
Find your high-school and college graduation years.
- Education
GWA Calculator (Philippines)
Compute General Weighted Average on the Philippine 1.0–5.0 scale.
- Education
High School GPA Calculator
Weighted and unweighted GPA with honors/AP/IB course bonuses.
- Education
IELTS Score Calculator
Convert IELTS raw scores to band scores and an overall band.
- Education
Journal Impact Factor Calculator
Compute a journal's impact factor from citations and article count.
- Education
PTE Score Calculator
Weighted overall PTE Academic score with CEFR equivalent.
- Education
Semester Grade Calculator
Weighted course grade across all assignments.
- Education
Test Grade Calculator
Percentage and letter grade from correct answers, with optional penalties.
- Education
GPA Calculator (Pakistan)
CGPA on the Pakistani HEC 4.0 scale from marks and credit hours.
- Education
Classroom Spacing Calculator
Maximum desks in a room given social-distancing spacing.
- Photo & Video
Aspect Ratio Calculator
Find an aspect ratio from dimensions, or solve a missing dimension.
- Photo & Video
Image File Size Calculator
Estimate image file size by dimensions, bit depth, and format.
- Photo & Video
PPI Calculator
Pixels per inch from screen resolution and diagonal size.
- Photo & Video
Screen Size Calculator
Width, height, and area from a diagonal and aspect ratio.
- Photo & Video
TV Size Calculator
Recommended TV diagonal for your seating distance.
- Photo & Video
TV Mounting Height Calculator
Ideal wall height to mount a TV for eye-level viewing.
- Photo & Video
Video File Size Calculator
Estimate video file size from duration, resolution, and codec.
- Photo & Video
Exposure (EV) Calculator
Compute exposure value from aperture, shutter speed, and ISO.
- Photo & Video
Depth of Field Calculator
Near, far, and total depth of field for any lens setup.
- Photo & Video
Focal Length Calculator
Focal length from sensor size and field of view, plus 35mm equivalent.
- Photo & Video
Crop Factor Calculator
Crop factor and 35mm-equivalent focal lengths from sensor dimensions.
- Photo & Video
Resolution Scale Calculator
Scale a resolution by a factor and see the pixel-count change.
- Photo & Video
Time-Lapse Calculator
Photos, video length, and storage for a time-lapse shoot.
- Photo & Video
Shutter Speed Calculator
Recommended shutter speed for handheld, motion, or astro shots.
- Photo & Video
Camera Field of View Calculator
Horizontal, vertical, and diagonal angle of view for a lens.
- Photo & Video
Hyperfocal Distance Calculator
The focus distance that maximizes depth of field.
- Photo & Video
Pixels to Print Size Calculator
Maximum print size for an image at a chosen DPI.
- Photo & Video
Projector Throw Calculator
Throw distance or screen size from a projector's throw ratio.
- Photo & Video
Image Ratio Calculator
Resize an image keeping its aspect ratio.
- Photo & Video
Contrast Ratio Calculator
Display contrast ratio from white and black luminance.
- Photo & Video
Lens Magnification Calculator
Magnification and reproduction ratio for a lens at a subject distance.
- Photo & Video
Blink-Free Photo Calculator
How many shots you need for a blink-free group photo.
- Photo & Video
Frames to Timecode Calculator
Convert a frame number to HH:MM:SS:FF timecode.
- Photo & Video
Timecode to Frames Calculator
Convert HH:MM:SS:FF timecode to a total frame count.
- Photo & Video
Film Shoot Calculator
Rolls, frames, and cost for an analog film shoot.
- Photo & Video
Vertical Exaggeration Calculator
Vertical exaggeration factor for profiles and cross-sections.
- Photo & Video
3D Render Time Calculator
Total render time and completion date for a 3D project.
- Photo & Video
Streaming Bitrate Calculator
Recommended streaming bitrate and required upload speed.
- Music
BPM Calculator
Calculate tempo (BPM) from a beat count and duration.
- Music
Note Frequency Calculator
Frequency of any musical note in equal temperament.
- Music
Music Interval Calculator
Name the interval between two notes and its frequency ratio.
- Music
Music Scale Calculator
Generate the notes of any scale from a root note.
- Music
Chord Calculator
Notes and intervals for any chord from a root note.
- Music
Chord Finder
Identify a chord from a set of notes.
- Music
Chord Inversion Calculator
Reorder a chord's notes into root, 1st, 2nd, or 3rd inversion.
- Music
Chord Progression Generator
Build a chord progression in any key.
- Music
Chord Transposer
Transpose a chord progression to a new key.
- Music
Music Transposition Calculator
Transpose a note up or down by a number of semitones.
- Music
Semitone Calculator
Count the semitones between two notes.
- Music
Key Signature Calculator
Sharps, flats, and relatives for any major or minor key.
- Music
Music Duration Calculator
Total playing time from BPM, time signature, and bar count.
- Music
Delay & Reverb Time Calculator
Note-synced delay times in milliseconds for a given tempo.
- Music
Guitar Fret Position Calculator
Distance of each fret from the nut for a given scale length.
- Music
Guitar String Tension Calculator
Approximate string tension from gauge, scale length, and pitch.
- Music
Harmonic Series Calculator
First 16 harmonics of a fundamental frequency.
- Music
Vocal Range Calculator
Classify a voice type from the lowest and highest comfortable notes.
- Music
Speaker Box Volume Calculator
Recommended enclosure volume for a driver.
- Music
Speaker Port Length Calculator
Port length for a vented speaker enclosure.
- Music
Audio File Size Calculator
Estimate audio file size by sample rate, bit depth, and channels.
- Tech & Electronics
Battery Life Calculator
Estimate device runtime from battery capacity and consumption.
- Tech & Electronics
Battery Capacity Calculator
Convert between Ah, Wh, and joules for a battery.
- Tech & Electronics
Battery Size Calculator
Minimum battery capacity for a target runtime.
- Tech & Electronics
Drone Flight Time Calculator
Estimate drone flight time from battery and motor draw.
- Tech & Electronics
Drone Motor Calculator
Thrust per motor and thrust-to-weight ratio for a multirotor.
- Tech & Electronics
Duty Cycle Calculator
Duty cycle, frequency, and average voltage of a PWM signal.
- Tech & Electronics
eDPI Calculator
Effective DPI for FPS mouse sensitivity comparison.
- Tech & Electronics
Password Entropy Calculator
Estimate password strength in bits of entropy and crack time.
- Tech & Electronics
RAID Calculator
Usable storage and fault tolerance for a RAID array.
- Tech & Electronics
Chmod Calculator
Convert Unix file permissions to octal and symbolic notation.
- Tech & Electronics
IP Subnet Calculator
Network, broadcast, host range, and host count for an IPv4 subnet.
- Tech & Electronics
CIDR Calculator
Parse CIDR notation into network, range, and host count.
- Tech & Electronics
Bandwidth Calculator
Required bandwidth to transfer a file in a target time.
- Tech & Electronics
Upload Time Calculator
How long a file takes to upload at a given speed.
- Tech & Electronics
Uptime / SLA Calculator
Allowed downtime for a given uptime percentage.
- Tech & Electronics
Data Transfer Time Calculator
Transfer time across USB, Ethernet, Wi-Fi, 5G, and fiber.
- Tech & Electronics
Baud Rate Calculator
Effective data throughput of a serial connection.
- Tech & Electronics
IP Address Converter
Convert an IPv4 address between dotted-decimal, integer, and hex.
- Tech & Electronics
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to text.
- Tech & Electronics
ASCII Converter
Convert text to ASCII codes and back.
- Tech & Electronics
Hamming Code Calculator
Add Hamming parity bits to a binary data word.
- Tech & Electronics
Hamming Distance Calculator
Count differing bits between two binary strings.
- Tech & Electronics
Parity Bit Calculator
Compute the parity bit for a binary data word.
- Tech & Electronics
Logic Gate Calculator
Evaluate any 2-input logic gate and show its truth table.
- Tech & Electronics
Op-Amp Gain Calculator
Voltage gain of inverting and non-inverting op-amp circuits.
- Tech & Electronics
PCB Trace Width Calculator
Minimum trace width for a current using the IPC-2221 standard.
- Tech & Electronics
PCB Trace Resistance Calculator
Resistance and voltage drop of a PCB copper trace.
- Tech & Electronics
PCB Trace Current Calculator
Maximum current a PCB trace can carry (IPC-2221).
- Tech & Electronics
PCB Impedance Calculator
Characteristic impedance of a microstrip PCB trace.
- Tech & Electronics
Cable Impedance Calculator
Characteristic impedance of a coaxial cable.
- Tech & Electronics
Signal Propagation Delay Calculator
Signal travel delay through a trace or cable.
- Tech & Electronics
LM317 Resistor Calculator
Resistor value for a target LM317 regulator output voltage.
- Tech & Electronics
RAM Latency Calculator
True memory latency in nanoseconds from CL and frequency.
- Tech & Electronics
L-Network Impedance Matching Calculator
L-network component values to match two impedances.
- Tech & Electronics
Total Harmonic Distortion Calculator
THD from a fundamental and its harmonic amplitudes.
- Tech & Electronics
RF Power Unit Converter
Convert RF power between dBm, watts, and dBW.
- Tech & Electronics
Vigenère Cipher Calculator
Encrypt or decrypt text with the Vigenère cipher.
- Tech & Electronics
Hex to Text Converter
Decode a hexadecimal string into readable text.
- Tech & Electronics
IEEE 754 Floating-Point Calculator
Show the IEEE 754 single-precision representation of a number.
- Tech & Electronics
Ground Sample Distance (GSD) Calculator
GSD for aerial/drone mapping from sensor, lens, and altitude.
- Internet & Network
Bandwidth-Delay Product Calculator
Data in flight on a network path — the ideal TCP window size.
- Video Games
K/D Ratio Calculator
Compute your kill/death ratio and KDA from kills, deaths, and assists.
- Video Games
Minecraft Circle Generator
Generate the block count and shape data for a Minecraft circle of any diameter.
- Video Games
Minecraft Stack Calculator
Work out full stacks, leftovers, and chest space for any pile of Minecraft items.
- Video Games
Nether Portal Calculator
Convert Overworld coordinates to the Nether and back at Minecraft's 1:8 ratio.
- Video Games
Minecraft Stronghold Distance Estimator
Estimate how far a Minecraft stronghold sits from the world origin by its ring.
- Video Games
Pokémon GO Candy Calculator
Find how much candy you need to evolve a Pokémon and how far you must walk for it.
- Video Games
Pyramid Block Calculator
Count the blocks needed to build a solid, hollow, or stepped pyramid.
- Video Games
Rust Decay Calculator
Estimate how much health a Rust structure loses to decay while you are offline.
- Video Games
Impostor Odds Calculator
Work out your chance of being the impostor in a social-deduction party game.
- Logistics
CBM Calculator
Calculate cubic metres (CBM) of a shipment from carton dimensions and quantity.
- Logistics
Dimensional Weight Calculator
Find the billable weight of a parcel by comparing actual weight to dimensional weight.
- Logistics
DPMO Calculator
Calculate Defects Per Million Opportunities and the matching Six Sigma level.
- Logistics
Freight Class Calculator
Determine NMFC freight class from a shipment's weight and dimensions by density.
- Logistics
Pallet Calculator
Work out how many boxes fit on a pallet, with layers and total stack weight.
- Logistics
Reorder Point Calculator
Calculate the inventory reorder point from demand, lead time, and safety stock.
- Logistics
Takt Time Calculator
Calculate takt time — the production pace needed to meet customer demand.
- Logistics
Container Loading Calculator
Estimate how many shipping containers a cargo load needs by volume and weight.
- Seasons & Holidays
Christmas Countdown Calculator
See exactly how many days, weeks, and shopping days are left until Christmas.
- Seasons & Holidays
Easter Date Calculator
Find the date of Easter Sunday for any year using the Gregorian algorithm.
- Seasons & Holidays
Snowman Calculator
Size the three balls of a snowman and estimate how much snow you need.
- Seasons & Holidays
Vampire Apocalypse Calculator
Model how fast vampires could convert the human population through exponential growth.
- Seasons & Holidays
Zombie Invasion Calculator
Estimate how fast a zombie outbreak spreads using a simplified infection model.
- Seasons & Holidays
Trick-or-Treat Calculator
Estimate the candy haul and walking distance from a night of trick-or-treating.
- Seasons & Holidays
White Christmas Calculator
See the historical probability of snow on the ground on Christmas Day by city.
- Seasons & Holidays
Mayan Calendar Converter
Convert any Gregorian date to the Maya Long Count, Tzolkin, and Haab calendars.
- Seasons & Holidays
New Year's Resolutions Calculator
Plan a resolution: see days left in the year and total hours you can commit.
- Earth & Weather
Wind Chill Calculator
Calculate the NWS wind chill temperature and frostbite risk from temp and wind speed.
- Earth & Weather
Rainfall Collection Calculator
Calculate the volume of water collected from rainfall over a given area.
- Earth & Weather
Rain to Snow Calculator
Convert rainfall to expected snowfall using temperature-based snow ratios.
- Earth & Weather
Sunbathing Time Calculator
Estimate safe sun exposure time from skin type, UV index, and sunscreen SPF.
- Earth & Weather
Earthquake Energy Calculator
Calculate the energy released by an earthquake and its intensity at a distance.
- Earth & Weather
Antipode Calculator
Find the exact point on the opposite side of the Earth from any coordinates.
- Earth & Weather
Azimuth Calculator
Calculate the compass bearing (azimuth) from one coordinate to another.
- Earth & Weather
Latitude / Longitude Distance Calculator
Calculate the great-circle distance between two coordinates with the Haversine formula.
- Other
Engagement Rate Calculator
Calculate social media engagement rate from followers, likes, comments, and shares.
- Other
Oxygen Tank Duration Calculator
Estimate how long a medical oxygen cylinder lasts at a given flow rate.
- Other
Diamond Weight Calculator
Estimate the carat weight of a diamond from its shape and millimetre measurements.
- Other
Gender Pay Gap Calculator
Calculate the pay gap between two salaries as a percentage and dollar difference.
- Other
PERT Calculator
Calculate a PERT three-point estimate with standard deviation and variance.
- Other
NaNoWriMo Calculator
Track your novel-writing pace and find the daily word count needed to hit your goal.
- Other
Salt Dough Calculator
Scale a salt dough recipe up or down for any number of batches.
- Other
Pizza Tip Calculator
Split a pizza order with tip across friends and see the per-person cost.
- Other
Matched Betting Calculator
Calculate the lay stake, liability, and locked-in profit for a matched bet.
- Other
Day of the Week Calculator
Find the day of the week for any date, plus day number and week of the year.
- Other
Recruitment Process Duration Calculator
Estimate total time-to-hire by adding up each stage of your recruitment process.
- Other
Aquarium Volume Calculator
Calculate aquarium volume, full weight, and fish capacity from tank dimensions.
- Other
Aquarium Glass Thickness Calculator
Estimate the minimum glass thickness needed for an aquarium of a given size.
- Other
Sandbox Sand Calculator
Calculate how much sand a sandbox needs and the number of bags to buy.
- Other
Caesar Cipher Shifter
Encrypt or decrypt text with a Caesar cipher and see all 25 brute-force shifts.
- Other
US Flag Proportions Calculator
Calculate every dimension of a US flag from its hoist height per Executive Order 10834.
- Other
D&D 5e Hit Points Calculator
Calculate a D&D 5e character's hit points by class, level, and Constitution modifier.
- Other
D&D 5e Encounter Difficulty Calculator
Rate a D&D 5e combat encounter as easy, medium, hard, or deadly by XP thresholds.
- Other
D&D 5e Point Buy Calculator
Track the 27-point budget for D&D 5e ability scores and see the modifiers.
- Other
Poker EV Calculator
Calculate the expected value of a poker call from pot size, bet, and your equity.
- Tech & Electronics
Lowercase to Uppercase Converter
Convert any lowercase text to UPPERCASE instantly in your browser.
- Tech & Electronics
Capital Case Converter
Capitalize the first letter of every word, including short words and articles.
- Tech & Electronics
Sentence Case Converter
Capitalize the first letter of each sentence and lowercase the rest.
- Tech & Electronics
Small Caps Generator
Convert text to ꜱᴍᴀʟʟ ᴄᴀᴘs using Unicode small-capital letters.
- Tech & Electronics
Small Text Generator
Convert text to ˢᵐᵃˡˡ superscript-style letters for bios and captions.
- Tech & Electronics
Strikethrough Text Generator
Add a Unicode strikethrough line through any text you can copy anywhere.
- Tech & Electronics
Subscript Generator
Convert numbers and letters to Unicode subscript characters.
- Tech & Electronics
Superscript Generator
Convert numbers and letters to Unicode superscript characters.
- Tech & Electronics
Gothic Font Generator
Convert text to 𝔤𝔬𝔱𝔥𝔦𝔠 Fraktur letters you can copy and paste.
- Tech & Electronics
Mirror Text Generator
Reverse text and create a mirrored backwards version you can copy.
- Tech & Electronics
Numbers to Letters Converter
Decode a number sequence into letters using A=1, B=2 … Z=26.
- Tech & Electronics
Letters to Numbers Converter
Encode letters into numbers using A=1, B=2 … Z=26.
- Tech & Electronics
Hash Identifier
Identify a hash type from its length and character set — MD5, SHA, bcrypt and more.
- Tech & Electronics
16:9 Aspect Ratio Calculator
Calculate the 16:9 height for any width — the standard widescreen video ratio.
- Tech & Electronics
16:10 Aspect Ratio Calculator
Calculate the 16:10 height for any width — common on laptop and monitor screens.
- Tech & Electronics
4:3 Aspect Ratio Calculator
Calculate the 4:3 height for any width — the classic fullscreen TV ratio.
- Tech & Electronics
CSS Aspect Ratio Calculator
Generate the CSS aspect-ratio property and padding-top percentage for any ratio.
- Tech & Electronics
Pixel Aspect Ratio Calculator
Calculate the pixel aspect ratio (PAR) from display and pixel dimensions.
- Tech & Electronics
Portrait Aspect Ratio Calculator
Calculate portrait-orientation heights at common ratios like 2:3, 3:4, and 9:16.
- Tech & Electronics
Screen Ratio Calculator
Find the simplified aspect ratio of any screen from its width and height.
- Seasons & Holidays
Days Until Fall Calculator
Count down the days until the first day of autumn (September 22).
- Seasons & Holidays
Days Until Valentine's Day
Count down the days remaining until Valentine's Day on February 14.
- Seasons & Holidays
New Year Countdown Calculator
Count down the days, hours, and minutes until New Year's Day.
- Other
Carat Weight Calculator
Convert gemstone weight in grams to carats and points.
- Other
Diamond Carat Calculator
Convert diamond weight to carats and estimate carat weight from a round diamond's diameter.
- Other
MM to Carat Conversion
Estimate a gemstone's carat weight from its millimetre diameter by shape.
- Education
What Grade Was I In Calculator
Find which US school grade you were in during any given year.