Rekenmachines

Brandstofkosten Calculator

Estimate the gas cost of any trip from distance, fuel economy, and the price per gallon.

Benzine Calculator

Figure out what it costs to top off your tank from its current level.

MPG Calculator

Compute real miles per gallon from your odometer and gallons pumped.

Snelheid Calculator

Calculate average speed from distance and time — supports hours and minutes.

Rijtijd Calculator

Estimate driving time including planned rest stops.

Woon-werkverkeer Calculator

Add up gas, insurance, and parking for the full year of commuting.

Roadtrip Kosten Calculator

Total a road trip budget: gas, hotels, and food, in one shot.

EV Laadkosten Calculator

See what charging your electric vehicle actually costs per month at home rates.

Tesla Laadkosten Calculator

Estimate weekly and yearly home charging cost for your Tesla model.

Auto-afschrijving Calculator

Estimate your car's current value after years and mileage.

Carpoolen Calculator

See how much carpooling cuts your annual commute cost.

BH-maat Calculator

Calculate your bra size from band and bust measurements.

Verzwaarde Deken Calculator

Find your ideal weighted blanket weight using the 10% rule.

Tafelkleed Maat Calculator

Find the right tablecloth size for any table and desired drop length.

Cirkelrok Calculator

Compute fabric size and waist radius for a full circle skirt.

Elektriciteitskosten Calculator

Compute the monthly cost of running any appliance from wattage and use.

Verfdekking Calculator

Estimate how many gallons of paint your room needs.

Vloer Calculator

Compute square footage and material needed including waste factor.

Tegels Calculator

Count tiles needed for any room with waste built in.

Hypotheek Calculator

Estimate monthly payments including principal, interest, taxes, and insurance.

Solar Panel Savings Calculator

Estimate annual savings and payback period for a residential solar install.

Airco BTU Calculator

Find the BTU rating you need to properly cool a room.

Fooi Calculator

Compute the tip and per-person split for any bill.

Korting Calculator

Find the sale price and savings for any percent off.

Salaris naar Uurloon

Convert an annual salary into an hourly rate.

Uurloon naar Salaris

Convert an hourly wage to monthly and annual income.

ROI Calculator

Compute return on investment and annualized return.

Winstmarge Calculator

Compute gross profit and margin from revenue and cost.

Freelance Tarief Calculator

Work out the hourly rate you need to charge to hit your income goal.

Pomodoro Calculator

Plan focus blocks and breaks using the 25/5 pomodoro technique.

Overuren Calculator

Compute weekly pay with overtime at 1.5x past 40 hours.

Vergaderkosten Calculator

Calculate what a meeting truly costs in payroll dollars.

Leeftijd Calculator

Calculate exact age in years, months, and days from any date of birth.

Dagen tot Kerstmis

How many days, hours, and minutes are left until Christmas Day?

Slaapcyclus Calculator

Find optimal wake-up or bedtime based on 90-minute sleep cycles.

Uitgerekende Datum

Estimate your due date and current pregnancy week from your last period.

Werkdagen Calculator

Count working days (Mon–Fri) between any two dates.

Munt Opgooien

Flip a virtual coin — heads or tails, fair random.

Dobbelsteen Roller

Roll any combination of D4, D6, D8, D10, D12, D20, or D100.

Willekeurige Getallengenerator

Generate random numbers in any range, with or without duplicates.

Ja of Nee Generator

Let randomness decide. A fair coin flip with words.

Sterrenbeeld Calculator

Look up your Western astrological sign from your date of birth.

Liefdescompatibiliteit Calculator

Just-for-fun compatibility score from two names.

Douchekosten Calculator

Compute the yearly cost of your showers in water and energy.

Zonnebrand Calculator

How much sunscreen you actually need per day at the beach.

Leestijd Calculator

Estimate how long a book or article will take to read.

Audioboek Snelheid Calculator

See how much time you save listening at higher playback speeds.

BMI Calculator

Body Mass Index from height and weight, with the standard category breakdown.

Calorie Calculator

Estimate daily calorie needs via Mifflin-St Jeor BMR and activity multiplier.

Waterinname Calculator

Estimate your daily water target adjusted for activity and climate.

Stappen naar Mijlen

Convert step counts to miles using your stride length or height estimate.

Percentage Calculator

Solve any percentage question: X% of Y, X is what % of Y, percent change.

Vierkante Meters Calculator

Compute area for rectangles, circles, and triangles in square feet.

Romeins Cijfer Converter

Convert any number 1–3999 to a Roman numeral and back.

Binair naar Decimaal

Convert between binary and decimal in either direction.

Breuken Calculator

Add, subtract, multiply, or divide two fractions with auto-simplification.

Currency Converter

Quick approximate currency conversion using static reference rates.

Pig Latin Vertaler

Translate any text into Pig Latin instantly.

Ondersteboven Tekst

Flip your text upside down with Unicode tricks.

Woordenteller

Count words, characters, and reading time for any text.

Horsepower Calculator

Compute horsepower from engine torque and RPM using the standard SAE formula.

Tire Size Calculator

Decode a tire size into overall diameter, sidewall height, and circumference.

Compression Ratio Calculator

Engine static compression ratio from bore, stroke, deck, gasket, and chamber volumes.

Rpm Calculator

Compute engine RPM at a given speed from tire size, gear, and final drive.

0 60 Calculator

Estimate 0-60 mph time from horsepower, weight, and drivetrain.

Wheel Horsepower Calculator

Estimate WHP at the wheels after drivetrain losses.

Turbo Size Calculator

Estimate compressor airflow target for a turbo build.

Boost Horsepower Calculator

Estimate boosted HP from a naturally-aspirated baseline and boost pressure.

Bsfc Calculator

Compute brake-specific fuel consumption from fuel flow and brake horsepower.

Wheel Offset Calculator

Compute wheel offset in mm from width and backspacing.

Speedometer Gear Calculator

Estimate the right driven-gear tooth count for accurate speedometer reading.

Boat Speed Calculator

Estimate top boat speed from HP and weight using Crouch's planing formula.

Nautical Mile Calculator

Convert between nautical miles, statute miles, and kilometers.

Crosswind Calculator

Resolve runway wind into headwind and crosswind components.

Flight Radiation Calculator

Estimate cosmic-ray radiation dose for a flight.

Gvwr Calculator

Total your truck's loaded weight and see which GVWR class it falls into.

Fuel Pump Calculator

Estimate fuel flow demand and per-injector load for a given HP target.

Traffic Density Calculator

Compute traffic density (vehicles per mile) from flow rate and speed.

Winch Size Calculator

Find the minimum winch capacity for your vehicle and terrain.

Parkeerkosten Calculator

Compare pay-as-you-go parking against a monthly pass.

Olieverversing Kosten Calculator

Compare DIY vs shop oil changes over a year of driving.

Car Insurance Estimator

Rough estimate of annual auto insurance premiums by age, vehicle, and coverage.

Fietssnelheid Calculator

Compute road-bike speed from cadence, gearing, and wheel size.

Train Vs Drive Calculator

Compare driving cost against a train ticket, including the value of your time.

Reis CO2-voetafdruk

Estimate CO₂ emissions for any trip by mode and distance.

Uber Vs Car Calculator

Compare monthly rideshare spend against the full cost of car ownership.

Miles To Dollars Calculator

Estimate the cash value of your airline miles by program and redemption.

Mijlen per Jaar Calculator

Total annual driving miles from commuting, leisure, and road trips.

Engine Hours To Miles

Convert engine hours (on a marine or industrial engine) to equivalent automotive miles.

Afstand Calculator

Solve any of distance, speed, or time given the other two.

Toll Cost Calculator

Add up weekly, monthly, and annual toll spend — and the E-ZPass discount.

Vliegtijd Calculator

Estimate flight time from distance, cruise speed, and layover length.

Ticket Optimizer

Should you buy event tickets now or wait? A simple heuristic by time-to-event and category.

Schoenmaat Conversie

Convert between US Men, US Women, UK, EU, and CM shoe sizes.

Ringmaat Converter

Convert between US, UK, EU, and inner diameter / circumference ring sizes.

Jurkmaat Calculator

Find your US, UK, and EU dress size from bust, waist, and hip measurements.

Jeansmaat Calculator

Get your W × L jeans size from waist and inseam measurements.

Hoedmaat Calculator

Find your hat size in numeric, fitted, and S/M/L formats from head circumference.

Riemmaat Calculator

Find the belt size to order from your pants waist or measured waist.

Jasmaat Calculator

Find your jacket size and length from chest, height, and weight.

Handschoenmaat Calculator

Find your glove size from hand circumference at the knuckles.

Sokmaat Calculator

Convert shoe size to sock size (S/M/L/XL).

T-shirt Maat Calculator

Get your t-shirt size from chest and waist measurements.

Broekmaat Calculator

Get your W × L pants size and a hip-to-waist ratio flag.

Kledingmaat Converter

Convert women's top sizes across US, UK, EU, AU, IT, FR, and JP.

Schoenmaat VS naar VK

Convert US shoe sizes to UK in either men's or women's sizing.

Schoenmaat VK naar VS

Convert UK shoe sizes to US in either men's or women's sizing.

Schoenmaat Heren naar Dames

Convert between men's and women's US shoe sizes (1.5-size offset).

Kinderschoenmaat Calculator

Convert measured foot length to US toddler/youth shoe size.

Garen Calculator

How many skeins you need for a project, with a 10% safety buffer.

Breinaaldmaat Converter

Convert knitting needle sizes between US, metric (mm), and old UK numbering.

Quilt Bies Calculator

Compute strips and yardage for quilt binding.

Halfvierkant Driehoek Calculator

Cut size and square count for half-square triangles.

Gordijnpaneel Calculator

Compute panel width and required fabric for window curtains.

Elastieklengte Calculator

Find elastic length for waistbands, cuffs, and necklines.

Naaigaren Calculator

Estimate thread consumed by a seam from length and stitch type.

Veterlengte Calculator

Find the right shoelace length for your shoe and lacing style.

Verloren Sokken Calculator

Estimate how many socks you've lost to the laundry over the years.

Bikini Calculator

Get top and bottom bikini sizes from bra size and hip measurement.

Behang Calculator

Calculate rolls of wallpaper needed for a room, with waste and pattern repeat.

Huur Betaalbaarheid Calculator

Check if your target rent fits the 30% rule and standard DTI limits.

Huisrenovatie Kosten

Get a price range for kitchen, bath, basement, and other renovations.

Verhuiskosten Calculator

Estimate the cost of a local, long-distance, or interstate move.

Gazonafmeting Calculator

Compute lawn area in square feet and acres, plus seed and mowing estimates.

Hekkosten Calculator

Estimate fence cost by perimeter, material, height, and gate count.

Storage Unit Size

Pick the right storage unit size for your home and items.

Kerstboom Afmeting

Find the right tree height and width for your room.

Kaars Brandtijd

Estimate how many hours a candle will burn from size, wick count, and wax type.

Isolatie R-Waarde

Find recommended R-value and additional insulation needed by climate zone.

Dumpster Size Calculator

Find the right roll-off dumpster size for your project.

Internet Speed Cost

See $-per-Mbps and whether your plan suits your usage.

Water Bill Calculator

Estimate monthly water usage and cost from household activity.

GPA Calculator

Calculate your weighted GPA across up to 6 courses, with letter grades and credit hours.

Cijfer Calculator

Compute your weighted course grade across up to 5 assignments.

Testscore Calculator

Compute percentage and letter grade from correct answers.

Werkuren Calculator

Daily, weekly, and monthly hours from start time, end time, and breaks.

Factuur Calculator

Subtotal, discount, tax, and total for up to 5 line items.

Break-Even Calculator

Units and revenue needed to cover fixed and variable costs.

Tekenteller

Characters, words, Twitter remaining, and SMS segments for any text.

Wachtwoordsterkte Checker

Score a password's strength locally based on length, variety, and patterns.

Lettergrootte Converter

Convert between px, pt, em, rem, vw, and percent at a chosen base.

Sat Score Calculator

Approximate scaled SAT scores from raw section scores.

Getallen naar Woorden

Spell out any number up to a trillion in English.

Omgekeerde Tekst Generator

Reverse a string character-by-character or word order.

Nato Phonetic Alphabet

Spell any word using the NATO phonetic alphabet.

Studietijd Calculator

Plan study hours per subject given an exam date and difficulty.

Tijdzone Converter

Convert a time between major world time zones.

Pensioendatum Calculator

Find your retirement date and time remaining based on age and country.

Dagen tot Verjaardag

Count down to your next birthday from today's date.

Werkdagen Berekenen

Count working days between two dates, excluding US federal holidays.

Bedtijd Calculator

Find the best bedtimes to wake refreshed at a target time.

Wektijd Calculator

Find the best wake times after a chosen bedtime.

Aftel Timer

Count down the days, hours, and minutes to any future date.

Hoe Lang Geleden Calculator

Count years, months, days, weeks, and hours since a past date.

Koreaanse Leeftijd Calculator

Convert international age to traditional Korean age.

Maanfase Calculator

Find the moon phase, illumination, and next full moon for any date.

Palindrome Date Finder

Find all palindrome dates in a given year.

Schrikkeljaar Calculator

Check whether a year is a leap year, plus the next and last leap year.

Tijdsduur Calculator

Difference between two times in hours, minutes, and seconds.

Tijd naar Decimaal

Convert HH:MM to a decimal hour value and back.

Audioboek Calculator

Plan your audiobook reading pace and yearly book goals.

TV-serie Duur

Total runtime of a series across seasons, episodes, and lengths.

Bingewatch Calculator

Find your binge finish date based on daily watch time.

Hangmat Ophang Calculator

Hang point height, tree spacing, and strap length for a comfy hammock.

Heliumballonnen Calculator

How many balloons does it take to lift a given weight?

Tentgrootte Calculator

Find the right tent capacity for your campers, gear, and style.

Numerologie Calculator

Compute Life Path and Name numbers from your DOB and full name.

Geluksgetal Generator

Generate lottery-style numbers seeded by your name and today's date.

Minecraft Dag Calculator

Convert between real minutes and Minecraft in-game days.

Robux naar USD

Convert Robux to dollars (and back) at both direct buy and DevEx rates.

Pokerkansen Calculator

Rough heads-up and multi-way win probability by hole-card category.

Schaakrating Calculator

Compute your new Elo after a single game vs an opponent.

Eiwit Calculator

Daily protein target by body weight, activity level, and goal.

Macro Calculator

Daily calories, protein, fat, and carb targets from your body and goal.

Lichaamsvet Calculator

Estimate body fat percentage with the US Navy method.

Ideaal Gewicht Calculator

Compare your weight to Devine, Robinson, Miller, Hamwi, and healthy-BMI ranges.

Looptempo Calculator

Find pace, time, or distance from any two of the three.

Verbrande Calorieën

Calories burned for any activity using MET values.

Diaper Calculator

Estimate diapers needed and cost by baby's age and brand.

Cost Of Having Baby

Total estimated cost of delivery plus the first five years.

Expiration Date Calculator

Estimate expected expiration date by item type.

Battery Charge Time

Estimate hours to charge a battery from current to target level.

Linear Inches Calculator

Total linear inches and airline carry-on / checked classification.

Headphone Power

How much amp power your headphones need to hit a target SPL.

Well Volume Calculator

Compute gallons of water in a well from diameter and depth.

Garbage Bag Size

Find the right gallon-rated bag size for your trash can.

Picture Frame Calculator

Compute mat, frame, and overall sizes for any artwork.

Kubieke Voet Calculator

Compute volume in cubic feet, yards, meters, and liters.

Hex naar Decimaal

Convert between hexadecimal and decimal, with binary preview.

Wetenschappelijke Rekenmachine

Evaluate math expressions with sin/cos/tan, log, sqrt, pi, e, and more.

Cijfer naar GPA

Convert a letter grade or percentage into GPA points.

Leesuitdaging Calculator

Track progress on a yearly reading goal and project your finish date.

Hoe Lang om een Boek te Lezen

Estimate hours to read a book at your pace.

Pagina's per Uur

Measure your actual reading speed in pages per hour and words per minute.

Boek Woordentelling

Typical word counts and page estimates by genre.

Goodreads Doel Calculator

Are you on pace for your Goodreads reading challenge?

Kindle Paginatelling

Convert KOLL Kindle pages to print pages and words.

Bad vs Douche Calculator

Find out whether baths or showers are cheaper for you over a year.

Haargroei Calculator

Months to grow your hair to a target length.

Beautyproducten Calculator

Annual cost of your beauty routine.

Tandpasta Calculator

Tubes per year and annual toothpaste cost.

Handen Wassen Tijd

WHO-recommended hand-washing time and song references.

Huidverzorging Kosten Calculator

Roll up the per-day and per-year cost of your skincare routine.

Parfum Houdbaarheid

How many weeks a perfume bottle will last at your usage.

Haarverfkosten

Annual hair color cost by method and frequency.

Make-up Kosten Calculator

Annual cost of your makeup kit.

Zeepgebruik Calculator

How long a bar of soap lasts and the monthly cost.

Maskers Calculator

Masks needed per month and annual cost by type.

Hoe Rijk Ben Ik

Where your income ranks against US (and rough global) distributions.

Net Worth Calculator

Compute net worth from assets minus liabilities; compare to age peers.

IQ-score Calculator

Rough IQ estimate from a raw test score — strictly informal.

Fantasy Football Calculator

Score a player line in standard, PPR, or half-PPR scoring.

Impact van Socialemediaverbod

Estimate reach and revenue lost if your account is banned.

Alternatieven voor TikTok-tijd

What you could do instead of scrolling TikTok for X minutes a day.

Alternatieven voor Socialemediatijd

Yearly hours sunk into social media — and what they could become.

Pixels To Inches

Convert between pixels and physical inches at any PPI.

Pounds And Ounces

Combine pounds and ounces into total weight in oz, grams, kg, and decimal lbs.

Feet And Inches Calculator

Convert, add, or subtract feet-and-inches values.

Height In Inches

Convert feet+inches height to inches, cm, and meters with a percentile note.

Acreage Calculator

Compute area in acres from any shape's dimensions.

Land Area Calculator

Land area in acres, hectares, bigha, katha, gaj, cent, and marla.

Lot Size To Acres

Convert lot size in square feet (or L×W) to acres and other units.

Lot Size To Sq Feet

Convert acres or other area units to square feet and find the side of a square lot.

Scale Calculator

Solve scaled, real, or ratio given the other two.

Download Time Calculator

How long a file will take to download at a given connection speed.

Torque To Hp

Compute horsepower from torque and RPM (or torque from HP and RPM).

Watts To Amps

Compute amperage from wattage at a chosen voltage.

Amps To Watts

Compute wattage from amperage at a chosen voltage.

Kwh To Kw

Convert between energy (kWh) and average power (kW) over a time period.

Dbm To Watts

Logarithmic conversion between dBm and watts.

Rms To Watts

Compute RMS and peak power from RMS voltage and impedance.

Joules To Volts

Convert energy and charge (or capacitance) into voltage.

Barometric Pressure

Pressure converted across all weather units with a forecast hint.

Ppm Calculator

Parts-per-million across PPM, PPB, ppt, percent, and mg/L.

Hardness Conversion

Convert between Rockwell C, Rockwell B, Brinell, Vickers, and Shore D.

Verhouding Calculator

Simplify, scale, percentage-ize, or split a ratio.

Imperial To Metric

One-stop imperial→metric conversion across length, weight, volume, temperature, speed.

Metric To Imperial

Convert metric to imperial across length, weight, volume, temperature, and speed.

Dimensional Analysis

Educational unit-conversion chain across length, weight, volume, speed, temperature.

ACT-score Calculator

Convert ACT raw section scores to scaled 1–36 scores and a composite.

Universiteits-GPA Calculator

Compute term and cumulative GPA on the 4.0 scale.

Eindcijfer Calculator

Find the score you need on the final exam to reach your target grade.

Cijfercurve Calculator

Apply square-root, flat-point, or scale-to-100 curves to a test score.

Afstudeerjaar Calculator

Find your high-school and college graduation years.

GWA Calculator

Compute General Weighted Average on the Philippine 1.0–5.0 scale.

Middelbare School GPA Calculator

Weighted and unweighted GPA with honors/AP/IB course bonuses.

IELTS-score Calculator

Convert IELTS raw scores to band scores and an overall band.

Impactfactor Calculator

Compute a journal's impact factor from citations and article count.

PTE-score Calculator

Weighted overall PTE Academic score with CEFR equivalent.

Semestercijfer Calculator

Weighted course grade across all assignments.

Toetscijfer Calculator

Percentage and letter grade from correct answers, with optional penalties.

GPA Calculator Pakistan

CGPA on the Pakistani HEC 4.0 scale from marks and credit hours.

Klaslokaal Afstand Calculator

Maximum desks in a room given social-distancing spacing.

Beeldverhouding Calculator

Find an aspect ratio from dimensions, or solve a missing dimension.

Afbeeldingsgrootte Calculator

Estimate image file size by dimensions, bit depth, and format.

PPI Calculator

Pixels per inch from screen resolution and diagonal size.

Schermgrootte Calculator

Width, height, and area from a diagonal and aspect ratio.

TV-grootte Calculator

Recommended TV diagonal for your seating distance.

TV-ophanghoogte Calculator

Ideal wall height to mount a TV for eye-level viewing.

Videogrootte Calculator

Estimate video file size from duration, resolution, and codec.

Belichting Calculator

Compute exposure value from aperture, shutter speed, and ISO.

Scherptediepte Calculator

Near, far, and total depth of field for any lens setup.

Brandpuntsafstand Calculator

Focal length from sensor size and field of view, plus 35mm equivalent.

Cropfactor Calculator

Crop factor and 35mm-equivalent focal lengths from sensor dimensions.

Resolutieschaal Calculator

Scale a resolution by a factor and see the pixel-count change.

Time-lapse Calculator

Photos, video length, and storage for a time-lapse shoot.

Sluitertijd Calculator

Recommended shutter speed for handheld, motion, or astro shots.

Beeldveld Calculator

Horizontal, vertical, and diagonal angle of view for a lens.

Hyperfocale Afstand Calculator

The focus distance that maximizes depth of field.

Pixels naar Afdrukmaat Calculator

Maximum print size for an image at a chosen DPI.

Projector Calculator

Throw distance or screen size from a projector's throw ratio.

Beeldverhouding Calculator

Resize an image keeping its aspect ratio.

Contrastverhouding Calculator

Display contrast ratio from white and black luminance.

Vergroting van een Lens Calculator

Magnification and reproduction ratio for a lens at a subject distance.

Knipperloze Foto Calculator

How many shots you need for a blink-free group photo.

Frames naar Timecode Calculator

Convert a frame number to HH:MM:SS:FF timecode.

Timecode naar Frames Calculator

Convert HH:MM:SS:FF timecode to a total frame count.

Film Calculator

Rolls, frames, and cost for an analog film shoot.

Verticale Overdrijving Calculator

Vertical exaggeration factor for profiles and cross-sections.

3D-rendering Calculator

Total render time and completion date for a 3D project.

Streaming Bitrate Calculator

Recommended streaming bitrate and required upload speed.

BPM Calculator

Calculate tempo (BPM) from a beat count and duration.

Notenfrequentie Calculator

Frequency of any musical note in equal temperament.

Muziekinterval Calculator

Name the interval between two notes and its frequency ratio.

Toonladder Calculator

Generate the notes of any scale from a root note.

Akkoord Calculator

Notes and intervals for any chord from a root note.

Akkoord Finder

Identify a chord from a set of notes.

Akkoordomkering Calculator

Reorder a chord's notes into root, 1st, 2nd, or 3rd inversion.

Akkoordprogressie Generator

Build a chord progression in any key.

Akkoord Transponeerder

Transpose a chord progression to a new key.

Muziektranspositie Calculator

Transpose a note up or down by a number of semitones.

Halftoon Calculator

Count the semitones between two notes.

Toonsoort Calculator

Sharps, flats, and relatives for any major or minor key.

Muziekduur Calculator

Total playing time from BPM, time signature, and bar count.

Delay en Reverb Calculator

Note-synced delay times in milliseconds for a given tempo.

Fret Calculator

Distance of each fret from the nut for a given scale length.

Gitaarsnaarspanning Calculator

Approximate string tension from gauge, scale length, and pitch.

Harmonische Reeks Calculator

First 16 harmonics of a fundamental frequency.

Stembereik Calculator

Classify a voice type from the lowest and highest comfortable notes.

Luidsprekerkast Calculator

Recommended enclosure volume for a driver.

Poortlengte Calculator

Port length for a vented speaker enclosure.

Audiobestandsgrootte Calculator

Estimate audio file size by sample rate, bit depth, and channels.

Batterijduur Calculator

Estimate device runtime from battery capacity and consumption.

Batterijcapaciteit Calculator

Convert between Ah, Wh, and joules for a battery.

Batterijgrootte Calculator

Minimum battery capacity for a target runtime.

Drone Vliegtijd Calculator

Estimate drone flight time from battery and motor draw.

Drone Motor Calculator

Thrust per motor and thrust-to-weight ratio for a multirotor.

Duty Cycle Calculator

Duty cycle, frequency, and average voltage of a PWM signal.

eDPI Calculator

Effective DPI for FPS mouse sensitivity comparison.

Wachtwoord Entropie Calculator

Estimate password strength in bits of entropy and crack time.

RAID Calculator

Usable storage and fault tolerance for a RAID array.

chmod Calculator

Convert Unix file permissions to octal and symbolic notation.

IP-subnet Calculator

Network, broadcast, host range, and host count for an IPv4 subnet.

CIDR Calculator

Parse CIDR notation into network, range, and host count.

Bandbreedte Calculator

Required bandwidth to transfer a file in a target time.

Uploadtijd Calculator

How long a file takes to upload at a given speed.

Uptime Calculator

Allowed downtime for a given uptime percentage.

Gegevensoverdracht Calculator

Transfer time across USB, Ethernet, Wi-Fi, 5G, and fiber.

Baudrate Calculator

Effective data throughput of a serial connection.

IP-adres Converter

Convert an IPv4 address between dotted-decimal, integer, and hex.

Base64 Encoder

Encode text to Base64 or decode Base64 back to text.

ASCII Converter

Convert text to ASCII codes and back.

Hamming-code Calculator

Add Hamming parity bits to a binary data word.

Hamming-afstand Calculator

Count differing bits between two binary strings.

Pariteitsbit Calculator

Compute the parity bit for a binary data word.

Logische Poort Calculator

Evaluate any 2-input logic gate and show its truth table.

Op-Amp Versterking Calculator

Voltage gain of inverting and non-inverting op-amp circuits.

PCB Spoor Breedte Calculator

Minimum trace width for a current using the IPC-2221 standard.

PCB Spoor Weerstand Calculator

Resistance and voltage drop of a PCB copper trace.

PCB Spoor Stroom Calculator

Maximum current a PCB trace can carry (IPC-2221).

PCB Impedantie Calculator

Characteristic impedance of a microstrip PCB trace.

Kabel Impedantie Calculator

Characteristic impedance of a coaxial cable.

Propagatievertraging Calculator

Signal travel delay through a trace or cable.

LM317 Calculator

Resistor value for a target LM317 regulator output voltage.

RAM Latentie Calculator

True memory latency in nanoseconds from CL and frequency.

Impedantie-aanpassing Calculator

L-network component values to match two impedances.

THD Calculator

THD from a fundamental and its harmonic amplitudes.

RF-eenheden Converter

Convert RF power between dBm, watts, and dBW.

Vigenère-cijfer Calculator

Encrypt or decrypt text with the Vigenère cipher.

Hex naar Tekst Converter

Decode a hexadecimal string into readable text.

Drijvende-komma Calculator

Show the IEEE 754 single-precision representation of a number.

GSD Calculator

GSD for aerial/drone mapping from sensor, lens, and altitude.

Bandbreedte-vertraging Product Calculator

Data in flight on a network path — the ideal TCP window size.

KD Calculator

Compute your kill/death ratio and KDA from kills, deaths, and assists.

Minecraft Cirkel Generator

Generate the block count and shape data for a Minecraft circle of any diameter.

Minecraft Stapel Calculator

Work out full stacks, leftovers, and chest space for any pile of Minecraft items.

Nether Portaal Calculator

Convert Overworld coordinates to the Nether and back at Minecraft's 1:8 ratio.

End Portaal Vinder

Estimate how far a Minecraft stronghold sits from the world origin by its ring.

Pokémon GO Snoep Calculator

Find how much candy you need to evolve a Pokémon and how far you must walk for it.

Piramide Blok Calculator

Count the blocks needed to build a solid, hollow, or stepped pyramid.

Rust Verval Calculator

Estimate how much health a Rust structure loses to decay while you are offline.

Bedrieger Kansen Calculator

Work out your chance of being the impostor in a social-deduction party game.

CBM Calculator

Calculate cubic metres (CBM) of a shipment from carton dimensions and quantity.

Volumetrisch Gewicht Calculator

Find the billable weight of a parcel by comparing actual weight to dimensional weight.

DPMO Calculator

Calculate Defects Per Million Opportunities and the matching Six Sigma level.

Vrachtklasse Calculator

Determine NMFC freight class from a shipment's weight and dimensions by density.

Pallet Calculator

Work out how many boxes fit on a pallet, with layers and total stack weight.

Bestelpunt Calculator

Calculate the inventory reorder point from demand, lead time, and safety stock.

Takttijd Calculator

Calculate takt time — the production pace needed to meet customer demand.

Container Belading Calculator

Estimate how many shipping containers a cargo load needs by volume and weight.

Kerst Aftellen

See exactly how many days, weeks, and shopping days are left until Christmas.

Pasen Calculator

Find the date of Easter Sunday for any year using the Gregorian algorithm.

Sneeuwpop Calculator

Size the three balls of a snowman and estimate how much snow you need.

Vampier Apocalyps Calculator

Model how fast vampires could convert the human population through exponential growth.

Zombie-invasie Calculator

Estimate how fast a zombie outbreak spreads using a simplified infection model.

Trick or Treat Calculator

Estimate the candy haul and walking distance from a night of trick-or-treating.

Witte Kerst Calculator

See the historical probability of snow on the ground on Christmas Day by city.

Maya-kalender Converter

Convert any Gregorian date to the Maya Long Count, Tzolkin, and Haab calendars.

Goede Voornemens Calculator

Plan a resolution: see days left in the year and total hours you can commit.

Gevoelstemperatuur Calculator

Calculate the NWS wind chill temperature and frostbite risk from temp and wind speed.

Regenval Calculator

Calculate the volume of water collected from rainfall over a given area.

Regen naar Sneeuw Calculator

Convert rainfall to expected snowfall using temperature-based snow ratios.

Zonnebad Calculator

Estimate safe sun exposure time from skin type, UV index, and sunscreen SPF.

Aardbeving Calculator

Calculate the energy released by an earthquake and its intensity at a distance.

Antipoden Calculator

Find the exact point on the opposite side of the Earth from any coordinates.

Azimut Calculator

Calculate the compass bearing (azimuth) from one coordinate to another.

Breedte-Lengtegraad Afstand Calculator

Calculate the great-circle distance between two coordinates with the Haversine formula.

Engagement Rate Calculator

Calculate social media engagement rate from followers, likes, comments, and shares.

Zuurstoftank Duur Calculator

Estimate how long a medical oxygen cylinder lasts at a given flow rate.

Diamantgewicht Calculator

Estimate the carat weight of a diamond from its shape and millimetre measurements.

Loonkloof Calculator

Calculate the pay gap between two salaries as a percentage and dollar difference.

PERT Calculator

Calculate a PERT three-point estimate with standard deviation and variance.

NaNoWriMo Calculator

Track your novel-writing pace and find the daily word count needed to hit your goal.

Zoutdeeg Calculator

Scale a salt dough recipe up or down for any number of batches.

Pizza Fooi Calculator

Split a pizza order with tip across friends and see the per-person cost.

Matched Betting Calculator

Calculate the lay stake, liability, and locked-in profit for a matched bet.

Dag van de Week Calculator

Find the day of the week for any date, plus day number and week of the year.

Wervingsproces Duur Calculator

Estimate total time-to-hire by adding up each stage of your recruitment process.

Aquarium Calculator

Calculate aquarium volume, full weight, and fish capacity from tank dimensions.

Aquarium Glas Dikte Calculator

Estimate the minimum glass thickness needed for an aquarium of a given size.

Zandbak Calculator

Calculate how much sand a sandbox needs and the number of bags to buy.

Caesar-cijfer Verschuiver

Encrypt or decrypt text with a Caesar cipher and see all 25 brute-force shifts.

VS Vlag Calculator

Calculate every dimension of a US flag from its hoist height per Executive Order 10834.

HP Calculator 5e

Calculate a D&D 5e character's hit points by class, level, and Constitution modifier.

Ontmoeting Calculator 5e

Rate a D&D 5e combat encounter as easy, medium, hard, or deadly by XP thresholds.

Point Buy Calculator 5e

Track the 27-point budget for D&D 5e ability scores and see the modifiers.

Poker EV Calculator

Calculate the expected value of a poker call from pot size, bet, and your equity.

Kleine Letters naar Hoofdletters

Convert any lowercase text to UPPERCASE instantly in your browser.

Hoofdletter Converter

Capitalize the first letter of every word, including short words and articles.

Zinsstijl Converter

Capitalize the first letter of each sentence and lowercase the rest.

Small Caps Generator

Convert text to ꜱᴍᴀʟʟ ᴄᴀᴘs using Unicode small-capital letters.

Kleine Tekst Generator

Convert text to ˢᵐᵃˡˡ superscript-style letters for bios and captions.

Doorgehaalde Tekst Generator

Add a Unicode strikethrough line through any text you can copy anywhere.

Subscript Generator

Convert numbers and letters to Unicode subscript characters.

Superscript Generator

Convert numbers and letters to Unicode superscript characters.

Gotische Lettertype Generator

Convert text to 𝔤𝔬𝔱𝔥𝔦𝔠 Fraktur letters you can copy and paste.

Spiegeltekst Generator

Reverse text and create a mirrored backwards version you can copy.

Cijfers naar Letters Converter

Decode a number sequence into letters using A=1, B=2 … Z=26.

Letters naar Cijfers Converter

Encode letters into numbers using A=1, B=2 … Z=26.

Hash-identificator

Identify a hash type from its length and character set — MD5, SHA, bcrypt and more.

16:9 Beeldverhouding Calculator

Calculate the 16:9 height for any width — the standard widescreen video ratio.

16:10 Beeldverhouding Calculator

Calculate the 16:10 height for any width — common on laptop and monitor screens.

4:3 Beeldverhouding Calculator

Calculate the 4:3 height for any width — the classic fullscreen TV ratio.

CSS Beeldverhouding Calculator

Generate the CSS aspect-ratio property and padding-top percentage for any ratio.

Pixel Beeldverhouding Calculator

Calculate the pixel aspect ratio (PAR) from display and pixel dimensions.

Portret Beeldverhouding Calculator

Calculate portrait-orientation heights at common ratios like 2:3, 3:4, and 9:16.

Schermverhouding Calculator

Find the simplified aspect ratio of any screen from its width and height.

Dagen tot de Herfst

Count down the days until the first day of autumn (September 22).

Dagen tot Valentijnsdag

Count down the days remaining until Valentine's Day on February 14.

Nieuwjaars Aftellen

Count down the days, hours, and minutes until New Year's Day.

Karaatgewicht Calculator

Convert gemstone weight in grams to carats and points.

Diamant Karaat Calculator

Convert diamond weight to carats and estimate carat weight from a round diamond's diameter.

mm naar Karaat Conversie

Estimate a gemstone's carat weight from its millimetre diameter by shape.

In Welke Klas Zat Ik

Find which US school grade you were in during any given year.