// conversions › 1 · Basic Converters
Convert mass between metric, avoirdupois and troy units, including metric and imperial tons, via the kilogram.
result = value × (from→kg) ÷ (to→kg)
It converts convert mass between metric, avoirdupois and troy units, including metric and imperial tons, via the kilogram by first normalising your value to the SI base unit (kilogram) and then scaling to your chosen target unit. This hub-and-spoke approach guarantees every unit pair is internally consistent.
5 pounds to kilograms: 5 × 0.45359237 = 2.268 kg (base), then ÷ 1 = 2.268 kg.
Mass (kilograms) is how much matter is present and never changes; weight is the force gravity exerts on that mass and varies with location. This tool converts mass. Note the three different "tons" — metric tonne 1000 kg, US short ton 907 kg, UK long ton 1016 kg.
Trade and shipping, precious metals (troy units), cooking and freight.
Conversions are exact ratios where the units are defined exactly (most SI and imperial units) and best-available constants otherwise. Extremely large or small magnitudes are shown in general (g) format; round-tripping through the base unit may introduce tiny floating-point differences in the final decimal places.