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Convert between different weight and mass units including metric, imperial, and scientific units.
This weight converter translates a value from one unit of mass to another — kilograms to pounds, grams to ounces, stones to kilograms, metric tonnes to US tons, and more. Enter a number once and read the equivalent in every supported unit at the same time, which is handy when a recipe, shipping label, or fitness plan mixes metric and imperial figures.
All conversions are based on the exact internationally defined relationships between units. The pound is defined as exactly 0.45359237 kilograms, and every other factor derives from the kilogram as the base unit, so the results are accurate rather than rounded approximations. The tool distinguishes weight units by system: metric (milligram, gram, kilogram, tonne), avoirdupois imperial and US customary (ounce, pound, stone, ton), and it keeps enough decimal places for practical use.
Strictly speaking, "weight" is a force and "mass" is the quantity of matter, but in everyday use — cooking, parcels, body weight, gym plates — the two terms are used interchangeably and this converter follows that common convention. Everything runs locally in your browser, so conversions are instant and work offline once the page has loaded. There are no rounding surprises from a server round-trip and nothing you type is sent anywhere.
One kilogram equals approximately 2.2046 pounds. The exact relationship is that one pound is defined as 0.45359237 kilograms, which the converter uses for precise results.
Mass is the amount of matter in an object and weight is the force gravity exerts on that mass. In everyday contexts the words are used interchangeably, and this tool converts the units people commonly call weight.
Yes. It supports the metric tonne (1,000 kg) as well as the US short ton, so you can convert between them without confusing the two.
They use the standard internationally defined conversion factors, so results are accurate to many decimal places rather than rough estimates.