Unit Converter
Convert length, weight, and temperature — one tool for everyday units.
One converter for the units you look up most: switch between Length, Weight, and Temperature modes, pick your from/to units, and get an instant, accurate result. Length and weight convert through exact base-unit factors; temperature is handled with the proper offset formulas.
How it's calculated
Length and weight use exact base-unit factors (meters and grams): result = value × factor[from] ÷ factor[to]. Temperature converts through Celsius with the standard offset formulas, since 0 °C = 32 °F = 273.15 K.
Frequently asked questions
How do I convert 5 km to miles?
Pick Length mode, enter 5, choose km → mi. The answer is about 3.107 miles, using the exact factor 1 km = 0.621371 mi.
Why is temperature a separate conversion?
Celsius, Fahrenheit, and Kelvin are affine scales — they have offsets, not just ratios. 0 °C = 32 °F = 273.15 K, and each scale converts through Celsius internally.
Does it cover small and large units?
Yes. The full select lists include millimeters through miles, milligrams through metric tons, and all three temperature scales.