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Fuel Cost Calculator

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

Gas Fill-Up Cost 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.

Speed Calculator

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

Drive Time Calculator

Estimate driving time including planned rest stops.

Annual Commute Cost Calculator

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

Road Trip Cost Calculator

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

EV Charging Cost Calculator

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

Tesla Charging Cost Calculator

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

Car Depreciation Calculator

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

Carpool Savings Calculator

See how much carpooling cuts your annual commute cost.

Bra Size Calculator

Calculate your bra size from band and bust measurements.

Weighted Blanket Calculator

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

Tablecloth Size Calculator

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

Circle Skirt Fabric Calculator

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

Electricity Cost Calculator

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

Paint Coverage Calculator

Estimate how many gallons of paint your room needs.

Flooring Calculator

Compute square footage and material needed including waste factor.

Tile Calculator

Count tiles needed for any room with waste built in.

Mortgage 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.

Air Conditioner BTU Calculator

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

Tip Calculator

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

Discount Calculator

Find the sale price and savings for any percent off.

Salary to Hourly Calculator

Convert an annual salary into an hourly rate.

Hourly to Salary Calculator

Convert an hourly wage to monthly and annual income.

ROI Calculator

Compute return on investment and annualized return.

Profit Margin Calculator

Compute gross profit and margin from revenue and cost.

Freelance Rate 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.

Overtime Pay Calculator

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

Meeting Cost Calculator

Calculate what a meeting truly costs in payroll dollars.

Age Calculator

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

Days Until Christmas

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

Sleep Cycle Calculator

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

Pregnancy Due Date Calculator

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

Business Days Calculator

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

Coin Flip

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

Dice Roller

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

Random Number Generator

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

Yes or No Generator

Let randomness decide. A fair coin flip with words.

Zodiac Sign Calculator

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

Love Compatibility Calculator

Just-for-fun compatibility score from two names.

Shower Cost Calculator

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

Sunscreen Calculator

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

Reading Time Calculator

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

Audiobook Speed 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 (TDEE)

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

Water Intake Calculator

Estimate your daily water target adjusted for activity and climate.

Steps to Miles Calculator

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.

Square Footage Calculator

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

Roman Numeral Converter

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

Binary ↔ Decimal Converter

Convert between binary and decimal in either direction.

Fraction Calculator

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

Currency Converter (Static)

Quick approximate currency conversion using static reference rates.

Pig Latin Translator

Translate any text into Pig Latin instantly.

Upside Down Text Generator

Flip your text upside down with Unicode tricks.

Word & Character Counter

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.

Engine RPM Calculator

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

0-60 mph Calculator

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

Wheel Horsepower Calculator

Estimate WHP at the wheels after drivetrain losses.

Turbo Sizing 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 (Crouch)

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

Nautical Mile Converter

Convert between nautical miles, statute miles, and kilometers.

Crosswind Component 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 Sizing 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.

Parking Cost Calculator

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

Oil Change Cost 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.

Bike Speed 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.

Travel Carbon Footprint Calculator

Estimate CO₂ emissions for any trip by mode and distance.

Uber vs Owning a Car Calculator

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

Airline Miles to Dollars Calculator

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

Miles Driven Per Year Calculator

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

Engine Hours to Miles Calculator

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

Distance Calculator (d = s × t)

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.

Flight Time Calculator

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

Event Ticket Buy / Wait Optimizer

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

Shoe Size Conversion Calculator

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

Ring Size Converter

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

Dress Size Calculator

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

Jeans Size Calculator

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

Hat Size Calculator

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

Belt Size Calculator

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

Jacket Size Calculator

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

Glove Size Calculator

Find your glove size from hand circumference at the knuckles.

Sock Size Calculator

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

T-Shirt Size Calculator

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

Pants Size Calculator

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

Women's Clothing Size Converter

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

US to UK Shoe Size Converter

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

UK to US Shoe Size Converter

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

Men's ↔ Women's Shoe Size Converter

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

Kids Shoe Size Calculator

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

Yarn Skein Calculator

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

Knitting Needle Size Converter

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

Quilt Binding Calculator

Compute strips and yardage for quilt binding.

Half-Square Triangle Calculator

Cut size and square count for half-square triangles.

Curtain Panel Calculator

Compute panel width and required fabric for window curtains.

Elastic Length Calculator

Find elastic length for waistbands, cuffs, and necklines.

Sewing Thread Calculator

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

Shoelace Length Calculator

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

Lost Socks Calculator (Fun)

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

Bikini Size Calculator

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

Wallpaper Calculator

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

Rent Affordability Calculator

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

Home Renovation Cost Estimator

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

Moving Cost Calculator

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

Lawn Size Calculator

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

Fence Cost Calculator

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

Storage Unit Size Calculator

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

Christmas Tree Size Calculator

Find the right tree height and width for your room.

Candle Burn Time Calculator

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

Insulation R-Value Calculator

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 Calculator

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.

Weighted Grade Calculator

Compute your weighted course grade across up to 5 assignments.

Test Score Calculator

Compute percentage and letter grade from correct answers.

Work Hours Calculator

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

Invoice 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.

Character Count Calculator

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

Password Strength Checker

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

Font Size 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.

Numbers to Words Converter

Spell out any number up to a trillion in English.

Reverse Text Generator

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

NATO Phonetic Alphabet Converter

Spell any word using the NATO phonetic alphabet.

Study Time Calculator

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

Time Zone Converter

Convert a time between major world time zones.

Retirement Date Calculator

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

Days Until Birthday

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

Work Days Calculator

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

Bedtime Calculator

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

Wake Up Time Calculator

Find the best wake times after a chosen bedtime.

Countdown to Any Date

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

How Long Ago Calculator

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

Korean Age Calculator

Convert international age to traditional Korean age.

Moon Phase Calculator

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

Palindrome Date Finder

Find all palindrome dates in a given year.

Leap Year Calculator

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

Time Duration Calculator

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

Time to Decimal Converter

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

Audiobook Reading Pace Calculator

Plan your audiobook reading pace and yearly book goals.

TV Series Duration Calculator

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

Binge Watching Calculator

Find your binge finish date based on daily watch time.

Hammock Hang Calculator

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

Helium Balloons to Lift Calculator

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

Tent Size Calculator

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

Numerology Calculator

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

Lucky Number Generator

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

Minecraft Day Calculator

Convert between real minutes and Minecraft in-game days.

Robux to USD Converter

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

Poker Pre-Flop Odds Calculator

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

Chess Elo Rating Calculator

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

Protein Intake 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.

Body Fat Calculator (US Navy)

Estimate body fat percentage with the US Navy method.

Ideal Weight Calculator

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

Running Pace Calculator

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

Calories Burned Calculator

Calories burned for any activity using MET values.

Diaper Cost & Quantity Calculator

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

Cost of Having a Baby Calculator

Total estimated cost of delivery plus the first five years.

Food Expiration Date Calculator

Estimate expected expiration date by item type.

Battery Charge Time Calculator

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

Linear Inches Calculator (Luggage)

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

Headphone Power Calculator

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

Well Water Volume Calculator

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

Garbage Bag Size Calculator

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

Picture Frame Calculator

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

Cubic Feet Calculator

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

Hex ↔ Decimal Converter

Convert between hexadecimal and decimal, with binary preview.

Scientific Calculator

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

Grade to GPA Calculator

Convert a letter grade or percentage into GPA points.

Reading Challenge Calculator

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

How Long to Read a Book

Estimate hours to read a book at your pace.

Pages Per Hour Calculator

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

Book Word Count Estimator

Typical word counts and page estimates by genre.

Goodreads Goal Calculator

Are you on pace for your Goodreads reading challenge?

Kindle Page Count Converter

Convert KOLL Kindle pages to print pages and words.

Bath vs Shower Cost Calculator

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

Hair Growth Calculator

Months to grow your hair to a target length.

Beauty Products Cost Calculator

Annual cost of your beauty routine.

Toothpaste Cost Calculator

Tubes per year and annual toothpaste cost.

Hand Washing Time Reference

WHO-recommended hand-washing time and song references.

Skincare Routine Cost Calculator

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

Perfume Longevity Calculator

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

Hair Dye Cost Calculator

Annual hair color cost by method and frequency.

Makeup Cost Calculator

Annual cost of your makeup kit.

Soap Usage Calculator

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

Face Mask Cost Calculator

Masks needed per month and annual cost by type.

How Rich Am I? Income Percentile

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 Estimator (Fun)

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

Fantasy Football Points Calculator

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

Social Media Ban Impact Calculator

Estimate reach and revenue lost if your account is banned.

TikTok Time Alternatives Calculator

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

Social Media Time Alternatives Calculator

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

Pixels ↔ Inches Calculator

Convert between pixels and physical inches at any PPI.

Pounds + Ounces Calculator

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

Feet + Inches Calculator

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

Height in Inches Calculator

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 (with South Asian units)

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

Lot Size to Acres Converter

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

Lot Size to Square Feet Converter

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 ↔ HP Calculator

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

Watts to Amps Calculator

Compute amperage from wattage at a chosen voltage.

Amps to Watts Calculator

Compute wattage from amperage at a chosen voltage.

kWh ↔ kW Calculator

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

dBm ↔ Watts Converter

Logarithmic conversion between dBm and watts.

RMS Voltage to Watts Calculator

Compute RMS and peak power from RMS voltage and impedance.

Joules to Volts Calculator

Convert energy and charge (or capacitance) into voltage.

Barometric Pressure Converter

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 Calculator

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

Ratio Calculator

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

Imperial to Metric Converter Hub

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

Metric to Imperial Converter Hub

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

Dimensional Analysis Tool

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