Calculators & unit converters

Choose the right shortcut

• Compare measurements with the appropriate unit converter.
• Check a calculation or split a bill with explicit tip and tax settings.

Read the selected tool’s instructions, supported formats and limits before starting. Review generated results before you use them.

9 tools that work now

• CalculatorA free calculator with history, percentages, fractions and scientific keys. Exact decimals, no sign-in.
• Length converterConvert metres, centimetres, feet, inches, miles and more using exact definitions.
• Area converterConvert square metres, square feet, acres, hectares and more.
• Volume converterConvert litres, millilitres, cups, gallons and fluid ounces, US and UK.
• Weight & mass converterConvert kilograms, pounds, ounces, grams, stones and tons.
• Temperature converterConvert between Celsius, Fahrenheit and kelvin.
• Speed converterConvert km/h, mph, metres per second, knots and feet per second.
• Time converterConvert milliseconds, seconds, minutes, hours, days and weeks.
• Tip & tax calculatorAdd sales tax and a tip, then split the bill so the shares add up exactly.