Every calculator.
Beautifully simple.

Finance, health, time, math and more. Accurate to the last digit, and private by design.

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Finance

Tips, loans, savings and investments, money math done right.

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Tip CalculatorSplit the bill and tip in seconds.Open
Quick Tip CalculatorA fast, no-frills tip and total.Open
Car Finance CalculatorMonthly payments, interest and total cost.Open
Rent CalculatorHow much rent you can comfortably afford.Open
Social Security CalculatorEstimate benefits by claiming age.Open
Percent Off CalculatorSale price and savings after a discount.Open
Investment CalculatorCompound growth with regular contributions.Open
Monthly Savings CalculatorReach a savings goal month by month.Open
Down Payment CalculatorDown payment, loan amount and savings plan.Open
Freelance Hourly Rate to Salary CalculatorTurn an hourly rate into take-home pay, or back.Open
Zakat CalculatorCalculate zakat at 2.5% using today's gold or silver nisab.Open
Subscription Bleed CalculatorSee what recurring spending costs today and what it could have become.Open
Commute Cost CalculatorThe yearly cost of your commute in gas, fees and time.Open
True Hourly Worth CalculatorFind the real work hours behind a purchase after tax and work costs.Open

Health

Calories, sleep, protein and more, based on established formulas.

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Due Date CalculatorEstimate your baby's due date.Open
Water Intake CalculatorHow much water to drink a day for your weight and activity.Open
Screen Time CalculatorSee the hours, years and value of your screen time.Open
Caffeine Half-Life CalculatorHow much caffeine is left in your body and when it clears.Open
Sleep Debt CalculatorHow much sleep you owe and how long to catch up.Open
Sleep CalculatorWake up between sleep cycles, refreshed.Open
Protein CalculatorDaily protein needs for your goals.Open
Calorie CalculatorDaily calories to maintain your weight.Open
Food Calorie CalculatorCalories in common foods by portion.Open
Weight Loss Calorie CalculatorA calorie target to lose weight safely.Open
Height CalculatorPredict a child's adult height.Open
Weight CalculatorHealthy weight range for your height.Open

Date & Time

Count days, ages, durations and working hours precisely.

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Date CalculatorAdd or subtract days, weeks, months.Open
Date to Date CalculatorExact time between two dates.Open
Age CalculatorYour exact age from date of birth.Open
Time CalculatorAdd and subtract hours and minutes.Open
Work Hours CalculatorWeekly hours from your timesheet.Open
Work Time CalculatorShift length minus breaks.Open
Time Duration CalculatorDuration between two times.Open

Math & Everyday

Ratios, areas, logs, conversions and everyday arithmetic.

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Aspect Ratio CalculatorResize while keeping proportions.Open
Distance CalculatorDistance between two points.Open
Log CalculatorLogarithms in any base.Open
Pizza Party CalculatorHow many pizzas to order for any number of people.Open
Wallpaper CalculatorRolls of wallpaper needed for any room, with waste.Open
Pool Volume CalculatorGallons in rectangle, round and oval pools.Open
Plant Watering CalculatorHow often and how much to water your houseplants.Open
Area CalculatorArea of common shapes.Open
Conversion CalculatorLength, weight, volume and more.Open
Speed CalculatorSpeed, distance and time.Open
Mulch and Gravel CalculatorCubic yards, bags and weight for any bed or path.Open
Candle Wax CalculatorWax and fragrance oil amounts for any candle jar.Open

Auto & Engineering

Voltage drop, stairs and tire sizes for builders and drivers.

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Voltage Drop CalculatorVoltage drop by wire size and length.Open
Epoxy Resin CalculatorHow much epoxy and hardener to mix for any pour.Open
Stair CalculatorRisers, treads and stringer length.Open
Tire Size CalculatorCompare tire sizes and speedometer error.Open
Concrete CalculatorCubic yards and bags for slabs, footings and posts.Open

Security

Strong, random passwords generated right on your device.

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Random Password GeneratorRandom passwords, made on your device.Open
Strong Password GeneratorLong, high-entropy passwords.Open
Free Password GeneratorSimple passwords and passphrases, free.Open

Why people trust us.

Accurate formulas

Published methods, unit-tested against known answers, rounded only at the end.

Private

Nothing is saved on our servers. Every calculation runs on your device.

Free

Every tool, free forever. No accounts, no paywalls.

Looking for a free online calculator?

However you typed it, calculator, calculater, caculator, calulator, caculater or calcualtor, you are in the right place. Aculator is a free online calculator site with tools for money, health, dates, math, home projects and security. Every result is worked out on your device, nothing you enter is saved, and there is no sign up.