Calculators and unit converters

Calculate expressions and ratios and convert units.

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Convert square meters, hectares, acres and other area units.

Calculate expressions with parentheses, arithmetic and powers.

Convert bits, bytes and decimal or binary data sizes.

Convert meters, kilometers, inches, feet and miles.

Convert kilograms, grams, pounds and ounces.

Calculate percentages, ratios and percentage change.

Simplify integer ratios and solve proportions.

Convert between m/s, km/h, mph and knots.

Split a bill with a rounding increment and an optional organizer contribution.

Convert Celsius, Fahrenheit and Kelvin.

Convert units of length, mass, area, volume, temperature and more.

Convert liters, cubic meters and US or UK gallons.