计算器

燃油成本计算器

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

汽油计算器

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

每加仑英里数计算器

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

速度计算器

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

驾驶时间计算器

Estimate driving time including planned rest stops.

通勤计算器

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

公路旅行费用计算器

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

电动汽车充电费用计算器

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

特斯拉充电费用计算器

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

汽车折旧计算器

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

拼车计算器

See how much carpooling cuts your annual commute cost.

文胸尺码计算器

Calculate your bra size from band and bust measurements.

加重毯子计算器

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

桌布尺寸计算器

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

圆裙计算器

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

电费计算器

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

油漆用量计算器

Estimate how many gallons of paint your room needs.

地板计算器

Compute square footage and material needed including waste factor.

瓷砖计算器

Count tiles needed for any room with waste built in.

房贷计算器

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

Solar Panel Savings Calculator

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

空调BTU计算器

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

小费计算器

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

折扣计算器

Find the sale price and savings for any percent off.

年薪转时薪

Convert an annual salary into an hourly rate.

时薪转年薪

Convert an hourly wage to monthly and annual income.

投资回报率计算器

Compute return on investment and annualized return.

利润率计算器

Compute gross profit and margin from revenue and cost.

自由职业费率计算器

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

番茄钟计算器

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

加班费计算器

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

会议成本计算器

Calculate what a meeting truly costs in payroll dollars.

年龄计算器

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

距离圣诞节天数

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

睡眠周期计算器

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

预产期计算器

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

工作日计算器

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

抛硬币

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

掷骰子

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

随机数生成器

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

是或否生成器

Let randomness decide. A fair coin flip with words.

星座计算器

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

爱情配对计算器

Just-for-fun compatibility score from two names.

淋浴费用计算器

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

防晒霜计算器

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

阅读时长计算器

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

有声书速度计算器

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

身体质量指数计算器

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

卡路里计算器

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

饮水量计算器

Estimate your daily water target adjusted for activity and climate.

步数到英里

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

百分比计算器

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

平方英尺计算器

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

罗马数字转换工具

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

二进制到十进制

Convert between binary and decimal in either direction.

分数计算器

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

Currency Converter

Quick approximate currency conversion using static reference rates.

Pig Latin 翻译器

Translate any text into Pig Latin instantly.

颠倒文字

Flip your text upside down with Unicode tricks.

字数统计

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.

停车费用计算器

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

换油费用计算器

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.

自行车速度计算器

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.

旅行碳足迹计算器

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.

每年英里数计算器

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.

距离计算器

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.

飞行时间计算器

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.

鞋码换算

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

戒指尺寸转换器

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

连衣裙尺码计算器

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

牛仔裤尺码计算器

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

帽子尺码计算器

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

腰带尺码计算器

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

夹克尺码计算器

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

手套尺码计算器

Find your glove size from hand circumference at the knuckles.

袜子尺码计算器

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

T恤尺码计算器

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

裤子尺码计算器

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

服装尺码转换器

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

美码到英码鞋码

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

英码到美码鞋码

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

男鞋到女鞋尺码

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

儿童鞋码计算器

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

纱线计算器

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

编织针尺寸转换器

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

被子滚边计算器

Compute strips and yardage for quilt binding.

半方形三角形计算器

Cut size and square count for half-square triangles.

窗帘面板计算器

Compute panel width and required fabric for window curtains.

松紧带长度计算器

Find elastic length for waistbands, cuffs, and necklines.

缝纫线计算器

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

鞋带长度计算器

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

丢失袜子计算器

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

比基尼计算器

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

墙纸计算器

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

租房负担能力计算器

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

房屋装修费用计算器

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

搬家费用计算器

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

草坪面积计算器

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

围栏费用计算器

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

Storage Unit Size

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

圣诞树尺寸计算器

Find the right tree height and width for your room.

蜡烛燃烧时间计算器

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

保温R值计算器

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计算器

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

成绩计算器

Compute your weighted course grade across up to 5 assignments.

考试分数计算器

Compute percentage and letter grade from correct answers.

工作时长计算器

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

发票计算器

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

盈亏平衡计算器

Units and revenue needed to cover fixed and variable costs.

字符统计

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

密码强度检测器

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

字体大小转换器

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

Sat Score Calculator

Approximate scaled SAT scores from raw section scores.

数字转文字

Spell out any number up to a trillion in English.

反转文字生成器

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

Nato Phonetic Alphabet

Spell any word using the NATO phonetic alphabet.

学习时间计算器

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

时区转换器

Convert a time between major world time zones.

退休日期计算器

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

距离生日天数

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

工作日数计算器

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

就寝时间计算器

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

起床时间计算器

Find the best wake times after a chosen bedtime.

倒计时器

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

多久以前计算器

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

韩国年龄计算器

Convert international age to traditional Korean age.

月相计算器

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

Palindrome Date Finder

Find all palindrome dates in a given year.

闰年计算器

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

时长计算器

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

时间转十进制

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

有声书计算器

Plan your audiobook reading pace and yearly book goals.

电视剧时长

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

追剧马拉松计算器

Find your binge finish date based on daily watch time.

吊床悬挂计算器

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

氦气球计算器

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

帐篷尺寸计算器

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

数字命理计算器

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

幸运数字生成器

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

Minecraft 天数计算器

Convert between real minutes and Minecraft in-game days.

Robux 兑美元

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

扑克赔率计算器

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

国际象棋评分计算器

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

蛋白质计算器

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

宏量营养素计算器

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

体脂率计算器

Estimate body fat percentage with the US Navy method.

理想体重计算器

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

跑步配速计算器

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

消耗的卡路里

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.

立方英尺计算器

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

十六进制到十进制

Convert between hexadecimal and decimal, with binary preview.

科学计算器

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

成绩转GPA

Convert a letter grade or percentage into GPA points.

阅读挑战计算器

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

读完一本书要多久

Estimate hours to read a book at your pace.

每小时页数

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

书籍字数统计

Typical word counts and page estimates by genre.

Goodreads 目标计算器

Are you on pace for your Goodreads reading challenge?

Kindle 页数

Convert KOLL Kindle pages to print pages and words.

泡澡 vs 淋浴计算器

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

头发生长计算器

Months to grow your hair to a target length.

美容产品计算器

Annual cost of your beauty routine.

牙膏计算器

Tubes per year and annual toothpaste cost.

洗手时间

WHO-recommended hand-washing time and song references.

护肤费用计算器

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

香水持久度

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

染发费用

Annual hair color cost by method and frequency.

化妆费用计算器

Annual cost of your makeup kit.

肥皂用量计算器

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

口罩计算器

Masks needed per month and annual cost by type.

我有多富有

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

Net Worth Calculator

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

智商分数计算器

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

梦幻橄榄球计算器

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

社交媒体禁令影响

Estimate reach and revenue lost if your account is banned.

TikTok 时间替代方案

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

社交媒体时间替代方案

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.

比例计算器

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 分数计算器

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

大学 GPA 计算器

Compute term and cumulative GPA on the 4.0 scale.

期末成绩计算器

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

成绩曲线计算器

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

毕业年份计算器

Find your high-school and college graduation years.

GWA 计算器

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

高中 GPA 计算器

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

雅思分数计算器

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

影响因子计算器

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

PTE 分数计算器

Weighted overall PTE Academic score with CEFR equivalent.

学期成绩计算器

Weighted course grade across all assignments.

测验成绩计算器

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

巴基斯坦 GPA 计算器

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

教室间距计算器

Maximum desks in a room given social-distancing spacing.

宽高比计算器

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

图像文件大小计算器

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

PPI 计算器

Pixels per inch from screen resolution and diagonal size.

屏幕尺寸计算器

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

电视尺寸计算器

Recommended TV diagonal for your seating distance.

电视安装高度计算器

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

视频文件大小计算器

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

曝光计算器

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

景深计算器

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

焦距计算器

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

裁切因子计算器

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

分辨率比例计算器

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

延时摄影计算器

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

快门速度计算器

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

相机视场角计算器

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

超焦距计算器

The focus distance that maximizes depth of field.

像素到打印尺寸计算器

Maximum print size for an image at a chosen DPI.

投影仪计算器

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

图像比例计算器

Resize an image keeping its aspect ratio.

对比度计算器

Display contrast ratio from white and black luminance.

镜头放大倍率计算器

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

无眨眼照片计算器

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

帧到时间码计算器

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

时间码到帧计算器

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

胶片计算器

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

垂直夸张计算器

Vertical exaggeration factor for profiles and cross-sections.

3D 渲染计算器

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

流媒体码率计算器

Recommended streaming bitrate and required upload speed.

BPM 计算器

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

音符频率计算器

Frequency of any musical note in equal temperament.

音乐音程计算器

Name the interval between two notes and its frequency ratio.

音阶计算器

Generate the notes of any scale from a root note.

和弦计算器

Notes and intervals for any chord from a root note.

和弦查找器

Identify a chord from a set of notes.

和弦转位计算器

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

和弦进行生成器

Build a chord progression in any key.

和弦移调器

Transpose a chord progression to a new key.

音乐移调计算器

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

半音计算器

Count the semitones between two notes.

调号计算器

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

音乐时长计算器

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

延迟和混响计算器

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

品丝计算器

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

吉他弦张力计算器

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

泛音列计算器

First 16 harmonics of a fundamental frequency.

音域计算器

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

音箱计算器

Recommended enclosure volume for a driver.

倒相管长度计算器

Port length for a vented speaker enclosure.

音频文件大小计算器

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

电池寿命计算器

Estimate device runtime from battery capacity and consumption.

电池容量计算器

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

电池尺寸计算器

Minimum battery capacity for a target runtime.

无人机飞行时间计算器

Estimate drone flight time from battery and motor draw.

无人机电机计算器

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

占空比计算器

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

eDPI 计算器

Effective DPI for FPS mouse sensitivity comparison.

密码熵计算器

Estimate password strength in bits of entropy and crack time.

RAID 计算器

Usable storage and fault tolerance for a RAID array.

chmod 计算器

Convert Unix file permissions to octal and symbolic notation.

IP 子网计算器

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

CIDR 计算器

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

带宽计算器

Required bandwidth to transfer a file in a target time.

上传时间计算器

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

正常运行时间计算器

Allowed downtime for a given uptime percentage.

数据传输计算器

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

波特率计算器

Effective data throughput of a serial connection.

IP 地址转换器

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

Base64编码器

Encode text to Base64 or decode Base64 back to text.

ASCII 转换器

Convert text to ASCII codes and back.

汉明码计算器

Add Hamming parity bits to a binary data word.

汉明距离计算器

Count differing bits between two binary strings.

奇偶校验位计算器

Compute the parity bit for a binary data word.

逻辑门计算器

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

运放增益计算器

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

PCB 走线宽度计算器

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

PCB 走线电阻计算器

Resistance and voltage drop of a PCB copper trace.

PCB 走线电流计算器

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

PCB 阻抗计算器

Characteristic impedance of a microstrip PCB trace.

电缆阻抗计算器

Characteristic impedance of a coaxial cable.

传播延迟计算器

Signal travel delay through a trace or cable.

LM317 计算器

Resistor value for a target LM317 regulator output voltage.

内存延迟计算器

True memory latency in nanoseconds from CL and frequency.

阻抗匹配计算器

L-network component values to match two impedances.

总谐波失真计算器

THD from a fundamental and its harmonic amplitudes.

RF 单位转换器

Convert RF power between dBm, watts, and dBW.

维吉尼亚密码计算器

Encrypt or decrypt text with the Vigenère cipher.

Hex 转文本

Decode a hexadecimal string into readable text.

浮点数计算器

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

GSD 计算器

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

带宽时延积计算器

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

KD 计算器

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

Minecraft 圆形生成器

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

Minecraft 堆叠计算器

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

下界传送门计算器

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

末地传送门查找器

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

宝可梦GO 糖果计算器

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

金字塔方块计算器

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

Rust 衰减计算器

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

内鬼概率计算器

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

CBM 计算器

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

体积重量计算器

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

DPMO 计算器

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

货运等级计算器

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

托盘计算器

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

再订货点计算器

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

节拍时间计算器

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

集装箱装载计算器

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

圣诞节倒计时

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

复活节计算器

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

雪人计算器

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

吸血鬼末日计算器

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

丧尸入侵计算器

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

不给糖就捣蛋计算器

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

白色圣诞节计算器

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

玛雅历转换器

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

新年决心计算器

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

风寒指数计算器

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

降雨量计算器

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

雨到雪计算器

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

日光浴计算器

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

地震计算器

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

对跖点计算器

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

方位角计算器

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

经纬度距离计算器

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

互动率计算器

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

氧气瓶持续时间计算器

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

钻石重量计算器

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

性别薪酬差距计算器

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

PERT 计算器

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

NaNoWriMo 计算器

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

盐面团计算器

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

披萨小费计算器

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

对冲投注计算器

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

星期几计算器

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

招聘流程时长计算器

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

水族箱计算器

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

水族箱玻璃厚度计算器

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

沙盒计算器

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

凯撒密码移位器

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

美国国旗计算器

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

5e HP 计算器

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

5e 遭遇计算器

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

5e 点数购买计算器

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

扑克 EV 计算器

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

小写到大写

Convert any lowercase text to UPPERCASE instantly in your browser.

首字母大写转换器

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

句首大写转换器

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

小型大写字母生成器

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

小文字生成器

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

删除线文本生成器

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

下标生成器

Convert numbers and letters to Unicode subscript characters.

上标生成器

Convert numbers and letters to Unicode superscript characters.

哥特字体生成器

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

镜像文字生成器

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

数字转字母

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

字母转数字

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

哈希识别器

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

16:9 宽高比计算器

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

16:10 宽高比计算器

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

4:3 宽高比计算器

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

CSS 宽高比计算器

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

像素宽高比计算器

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

竖屏宽高比计算器

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

屏幕比例计算器

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

距秋天还有多少天

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

距情人节还有多少天

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

新年倒计时

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

克拉重量计算器

Convert gemstone weight in grams to carats and points.

钻石克拉计算器

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

毫米转克拉

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

我那年在几年级

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