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Units supported
- Length, millimeters, centimeters, meters, kilometers, inches, feet, yards, miles
- Weight, milligrams, grams, kilograms, metric tons, ounces, pounds, stone
- Temperature. Celsius, Fahrenheit, Kelvin
- Speed, km/h, mph, m/s, knots
Frequently asked questions
How accurate are these conversions?+
Conversions use standard internationally recognized conversion factors, accurate to several decimal places, precise enough for everyday, academic, and most professional use.
Why does temperature work differently from the others?+
Length, weight, and speed all convert by multiplying by a fixed ratio. Temperature scales don't share a common zero point, so converting between them needs a formula with addition or subtraction as well as multiplication.