Weight Converter
Convert between metric and imperial mass units. Every factor comes from the exact international definition, so the result matches a scale, not an approximation.
1
1 Stone = 1 st
About this tool
Metric mass scales by powers of ten from the gram, which is why converting grams to kilograms only moves the decimal point. Imperial mass uses fixed historical ratios instead: 16 ounces to a pound, 14 pounds to a stone.
The two systems meet at one exact definition: the international avoirdupois pound is precisely 453.59237 grams, agreed in 1959. Every kilogram-to-pound conversion here follows from that constant rather than the rounded 2.2 most people use.
Frequently asked questions
- How many pounds are in a kilogram?
- About 2.20462 lb. The exact relationship runs the other way: one pound is precisely 453.59237 grams.
- What is a stone in kilograms?
- One stone is 14 pounds, or about 6.35 kg. It is still commonly used for body weight in the UK and Ireland.
- Is weight the same as mass?
- Not physically — mass is the amount of matter, weight is the force gravity applies to it. In everyday use on Earth the two are used interchangeably, which is what this converter does.
- How many ounces are in a pound?
- 16 avoirdupois ounces. The troy ounce used for precious metals is different at about 31.1 grams and is not included here.