Calculators
Unit converter
Convert length, mass and temperature using international measurement definitions.
Calculation
No thousands separators. Numbers: up to 1e100; nonzero magnitudes at least 1e-100. Results rounded to 12 significant digits.
Calculated in your browser. Your entries are not uploaded.
How to use this calculator
- Choose the calculation and input format.
- Enter your values or load the worked example.
- Read the result, then copy or download it as text.
Calculation rules
Length uses the international inch (0.0254 m), foot (0.3048 m), yard (0.9144 m) and mile (1609.344 m). One inch equals 2.54 centimetres. The foot is the international foot, rather than the historical US survey foot.
Questions and answers
Which mass and temperature definitions are used?
Mass uses the avoirdupois pound (0.45359237 kg) and ounce (one sixteenth of a pound). The tonne is 1000 kg. Temperature uses °F = °C × 9/5 + 32 and K = °C + 273.15. Values below absolute zero are rejected. Displayed decimal results are rounded.