500 calculators, useful tasks first
Search the complete collection by question or category. The default order is an editorial selection priority, not a worldwide usage ranking.
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- 1Math and TimePocket calculatorAdd to workspace
A real pocket keypad with exact decimal arithmetic, contextual percentages, memory and calculation history.
- 2Math and TimeScientific calculatorAdd to workspace
Evaluate expressions with parentheses, powers, roots, trigonometry, degrees or radians, and calculation history.
- 3Math and TimePercentage CalculatorAdd to workspace
Calculate a percentage of a value, and the value after a percentage increase or decrease.
- 4FinanceLoan CalculatorAdd to workspace
Estimate monthly loan payments, total interest, and total repayment instantly.
- 5FinanceMortgage CalculatorAdd to workspace
Estimate a mortgage payment from home price, down payment, rate, and term.
- 6HealthBMI CalculatorAdd to workspace
Body mass index from height and weight, with the standard adult categories, BMI Prime, and the healthy-weight range for your height.
- 7Math and TimeAge CalculatorAdd to workspace
Exact age in years, months and days, total days lived, and days until the next birthday.
- 8ConvertersLength Unit ConverterAdd to workspace
Convert length between metres, kilometres, centimetres, millimetres, inches, feet, and miles, with every unit shown side by side.
- 9BusinessDiscount CalculatorAdd to workspace
Calculate the final price and total savings after percentage and fixed discounts.
- 10BusinessTip CalculatorAdd to workspace
Split a restaurant bill after adding a chosen tip percentage.
- 11FinanceCompound Interest CalculatorAdd to workspace
Project how an initial balance and recurring monthly contributions can grow over time.
- 12Math and TimeDate Difference CalculatorAdd to workspace
Calendar interval between two dates in days, weeks and years-months-days.
- 13HealthBMR CalculatorAdd to workspace
Estimate resting energy expenditure with the Mifflin–St Jeor equation, from weight, height, age, and sex.
- 14HealthTDEE CalculatorAdd to workspace
Total daily energy expenditure from Mifflin–St Jeor BMR multiplied by an activity factor.
- 15HealthCalories Burned CalculatorAdd to workspace
Estimate exercise energy expenditure from MET intensity, body weight, and duration.
- 16ConvertersCurrency ConverterAdd to workspace
Convert an amount at a rate you enter, less an optional fee — no market rate is fetched or implied.
- 17ConvertersTemperature ConverterAdd to workspace
Convert temperature between Celsius, Fahrenheit, and Kelvin, with every scale shown side by side.
- 18ConvertersWeight ConverterAdd to workspace
Convert weight between kilograms, grams, pounds, and ounces, with every unit shown side by side.
- 19ConvertersArea ConverterAdd to workspace
Convert area between square metres, square feet, acres, and mu, with every unit shown side by side.
- 20ConvertersVolume ConverterAdd to workspace
Convert volume between litres, millilitres, cubic metres, and US gallons, with every unit shown side by side.
- 21Home and EverydayFuel Cost CalculatorAdd to workspace
Estimate trip fuel expense from distance, fuel economy, the fuel price you enter, and tolls and parking.
- 22ConvertersFuel Economy CalculatorAdd to workspace
Work out fuel economy from distance driven and fuel used: L/100km, km/L, and US and UK MPG.
- 23BusinessSales Tax CalculatorAdd to workspace
Estimate sales tax and the tax-inclusive total from a subtotal and tax rate.
- 24BusinessGross Margin CalculatorAdd to workspace
Calculate gross profit, gross margin, and the cost-of-goods ratio.
- 25BusinessProfit CalculatorAdd to workspace
Net profit, net margin, total cost, and cost ratio from revenue and costs.
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How this order works
The first eight are fixed everyday shortcuts. The remaining tools prioritize broadly useful tasks, then category coverage and distinct calculations. All 500 entries are real tools; examples and translated routes do not count as additional calculators.
We do not have an audited dataset establishing the worldwide top 500 calculators by use. We do not publish invented monthly visits or search volumes. Device usage reflects only interactions saved in this browser after you opt in.