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Get clear answers for everyday math, unit conversions, dates, finance, and measurement tasks — with no account required.

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Calculate percentages, increases, decreases and percentage differences.

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

Work out the sale price and amount saved after a percentage discount.

Find the number of days between two dates, or add/subtract days, weeks, months or years from a date.

Add, subtract, multiply and divide fractions, with results simplified automatically.

Estimate your monthly mortgage payment, total interest and total repayment from home price, down payment, rate and term.

Convert instantly between metric and imperial length units.

Convert instantly between metric and imperial weight units.

Convert between Celsius, Fahrenheit and Kelvin.

Calculate the area of a room or space in square feet or square meters.

Estimate how much concrete you need for a slab, wall, footing or column.

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