Free Online Calculators for Money, Health, Maths and More
Every calculator you need — from everyday math to business and finance decisions — in one place. Free, instant and no sign-up required.
General
All Calculators →The calculations you reach for every day: an online calculator with parentheses and keyboard support, a percentage calculator, and a discount calculator for shopping and pricing.
- CalculatorA free calculator with percentages, parentheses and full keyboard support.
- Percentage CalculatorEnter two numbers and get every common percentage answer at once.
- Discount CalculatorEnter the price and discount to see exactly what you pay and how much you save.
- Tip CalculatorEnter the bill and tip percentage to see what each person owes.
The maths you need for homework or on the job: area and volume, ratios, exponents, logarithms, quadratic roots, LCM and GCF, and probability.
- Ratio CalculatorEnter three values to find the fourth — the unknown in the proportion.
- Area CalculatorChoose a shape and enter its dimensions to get the area and perimeter.
- Volume CalculatorChoose a solid and enter its dimensions to get the volume, surface area and litres.
- Distance Formula CalculatorEnter the coordinates of two points to get the distance, midpoint and slope.
- Exponent CalculatorEnter a base and an exponent to get the power, its root and scientific notation.
- Log CalculatorEnter a number and choose a base to get its logarithm.
- Quadratic Formula CalculatorEnter the coefficients a, b and c to get the roots and the discriminant.
- LCM and GCF CalculatorEnter your numbers to get their greatest common factor, least common multiple and prime factors.
- Probability CalculatorEnter the probability of two events to see the chance of both, either or neither.
Salary & Work
All Calculators →Tools that help you understand your pay, compare job offers and price your time.
Loans & Interest
All Calculators →Work out monthly payments, total interest and full repayment schedules before you borrow.
Tax & VAT
All Calculators →Quickly add or remove VAT and sales tax from any amount.
Business
All Calculators →Tools that speed up pricing and cost decisions. Measure your profit margin, set the right selling price and find the sales volume you need to break even.
- Profit Margin CalculatorGet your gross profit, margin and markup from cost and selling price in seconds.
- Markup CalculatorAdd your markup to cost and see your selling price — before and after tax.
- Break-Even CalculatorFind out how many units you need to sell to cover all your costs.
- Pallet Loading CalculatorEnter your carton size to see how many fit per pallet, in how many layers, with a layout plan.
- Container Pallet CalculatorChoose the vehicle and pallet type to see how many pallets fit, the weight limit and the floor plan.
- Container Loading CalculatorEnter the carton size to see how many load loose into the vehicle and how much of the volume is used.
- Bulk Cargo CalculatorChoose the material and vehicle to see the loadable tonnage by volume and by weight.
- Currency ConverterEnter an amount and choose the currencies to see the value at the central bank rate.
Investment
All Calculators →See how your savings grow over time and measure the annualized performance of your investments.
- Compound Interest CalculatorSee how regular saving and compounding grow your money over time.
- ROI CalculatorMeasure how much an investment, campaign or project really earned.
- CAGR CalculatorFind the average yearly growth rate of revenue, investments or users.
- Savings CalculatorEnter what you can put aside each month and see what you will have years from now.
- Simple Interest CalculatorEnter the principal, the rate and the term to see how much interest accrues.
- Annuity CalculatorEnter your lump sum, the rate of return and the term to see how much you can draw each month.
- Retirement CalculatorEnter your age and monthly contribution to see how much you will have when you retire.
- Inflation CalculatorEnter an amount, an inflation rate and a number of years to see what your money will buy.
- Car Depreciation CalculatorEnter the car’s value and depreciation rates to see what it will be worth in a few years.
Health
All Calculators →Is your weight right for your height, how many calories and how much water do you need, what heart rate should you train at? The numbers about your body, in one place.
- BMI CalculatorEnter your height and weight to see your body mass index and the healthy weight range for your height.
- Ideal Weight CalculatorChoose your sex and enter your height to see your ideal weight from four well-known formulas.
- Body Fat CalculatorAll you need is a tape measure: enter your neck and waist to estimate your body fat percentage.
- Calorie CalculatorHow many calories should you eat a day? See what it takes to maintain, lose or gain weight.
- Protein CalculatorEnter your weight and pick your goal to see how many grams of protein you need a day.
- Water Intake CalculatorEnter your weight and daily exercise to see how much water you should drink a day.
- Calories Burned CalculatorPick an activity, enter your weight and the duration to see how many calories you burned.
- Heart Rate CalculatorEnter your age and resting heart rate to see the heart rate range to train in.
- Pace CalculatorEnter the distance you ran and your time to see your pace and race predictions.
- Due Date CalculatorEnter the first day of your last period to see your estimated due date and how far along you are.
- Sleep CalculatorEnter the time you need to wake up and see when to go to bed to wake feeling rested.
Date & Time
All Calculators →How old are you exactly, how many days until the holiday, what date is 90 days from now, what time is it in New York? Everything to do with calendars and clocks.
- Age CalculatorPick your date of birth to see your exact age in years, months and days.
- Days CalculatorPick two dates to see the number of days, weeks and working days between them.
- Date CalculatorPick a date and enter how much time to add; see the date it lands on.
- Week CalculatorPick a date to see which week and day of the year it falls on.
- Time CalculatorEnter a start and end time to see the duration in hours and minutes.
- Time Zone ConverterEnter a time and choose two cities to see what time it is on the other side.
Unit Converters
All Calculators →Inches to centimetres, pounds to kilograms, Fahrenheit to Celsius: convert between metric and imperial units in one step.
- Unit ConverterChoose what to convert and enter a value to see it in every unit at once.
- Length ConverterEnter a value and pick the units to convert between inches, centimetres, feet, metres, miles and kilometres.
- Weight ConverterEnter a value and pick the units to convert between kilograms, pounds, ounces and grams.
- Temperature ConverterEnter a temperature to see it in Celsius, Fahrenheit and Kelvin.
- Area Unit ConverterEnter a value to convert between square metres, square feet, acres and hectares.
- Volume Unit ConverterEnter a value to convert between litres, gallons, millilitres and cups.
- Speed ConverterEnter a speed to convert between km/h, mph, metres per second and knots.
- Data Size ConverterEnter a value to convert between megabytes, gigabytes, terabytes and bytes.
Education
All Calculators →Learn by doing: an online abacus with guided lessons and practice questions.
Random Tools
All Calculators →Fair, instant random tools: pick numbers, roll dice, flip a coin or draw raffle winners.
Why Calculatorify?
Free, no sign-up
Every tool is free to use — no account or download needed.
Private by design
Your numbers never leave your browser; all math runs on your device.
Instant results
Results update as you type, and every formula is explained on the page.