Unit Converter
Convert length, weight, and temperature units instantly — updates as you type.
How to use this tool
Pick a category, enter a value, then choose the "from" and "to" units. The converted result updates instantly as you type or change units.
About these conversions
Length and weight conversions use fixed, internationally standardized exact conversion factors (converting through a common base unit — meters for length, kilograms for weight). Temperature uses direct formulas since Celsius, Fahrenheit, and Kelvin don't share a common zero point.
Conversion factors: 1 in = 0.0254 m, 1 ft = 0.3048 m, 1 yd = 0.9144 m, 1 mi = 1609.344 m (all exact, international yard-and-pound agreement 1959); 1 lb = 0.45359237 kg, 1 oz = 0.028349523125 kg, 1 stone = 6.35029318 kg (all exact).
Frequently asked questions
How are length and weight conversions calculated?
Each unit has a fixed conversion factor to a base unit (meters for length, kilograms for weight). To convert between any two units, the value is converted to the base unit and then to the target unit, using internationally standardized exact conversion factors (e.g. 1 inch = 0.0254 meters exactly).
How is temperature converted, and why is it different?
Celsius, Fahrenheit, and Kelvin don't share a common zero point, so temperature conversion uses direct formulas instead of a simple multiplier: °F = °C × 9/5 + 32, K = °C + 273.15, and their inverses.
Are these conversion factors exact?
Yes, for the units included here. The inch, pound, and other common imperial units used in this tool have internationally agreed exact metric definitions (1 inch = 2.54 cm, 1 pound = 0.45359237 kg), so results are exact, not approximated, aside from normal decimal display rounding.