Mass Converter

How many kilograms are in a stone?

1 stone equals 6.35029 kilograms, which is exactly 14 pounds — so to convert stone to kg you multiply by 6.35029. Stone remains the everyday UK unit for body weight even though scales, medicine and sport increasingly use kilograms, which is why "stone to kg" is one of the most-searched conversions in Britain. The common round figures are 10 stone = 63.5 kg, 11 stone = 69.85 kg, 12 stone = 76.2 kg and 14 stone = 88.9 kg.

To go from kilograms back to stone and pounds, divide the kilograms by 6.35029 to get decimal stone, then multiply whatever is after the decimal point by 14 to recover the leftover pounds. The converter above and the plain-English summary underneath do this automatically, splitting the result into whole stone plus pounds the way a UK scale would show it.

How do you convert kilograms to pounds and ounces?

Multiply kilograms by 2.20462 to get pounds, and by 35.274 to get ounces, because 1 kg = 2.20462 lb and there are 16 ounces in a pound. So 70 kg is 154.3 lb, and a 5 kg bag of flour is about 11 lb or 176 oz. To reverse it, multiply pounds by 0.453592 to get kilograms, or divide ounces by 35.274. For the recipe-scale end of things, remember 1 ounce = 28.3495 grams, so 8 oz of butter is roughly 227 g.

Be careful with ounces in one specific context: precious metals are weighed in troy ounces, not the avoirdupois ounces on a kitchen scale. A troy ounce is 31.1035 g — about 10% heavier — so a "1 oz" gold coin weighs more than an ounce of sugar. This converter uses the standard avoirdupois ounce used for food and everyday goods.

How much is 70 kg in stone and pounds?

70 kg equals about 11 stone 0.3 lb, or 154.3 pounds. You can check this against the tool: type 70 into the Kilograms field and it returns 11.02311311 stone, 154.3235835 pounds, 2469.177336 ounces and 0.07 tonnes. The 11.02 decimal stone means 11 whole stone plus 0.02 × 14 ≈ 0.3 lb, which is why the plain-English summary shows "11 st 0.3 lb".

What is the difference between a tonne and a ton?

A metric tonne is exactly 1,000 kg, but a "ton" can mean two different imperial weights. The UK long ton is 2,240 lb = 1,016.05 kg, about 1.6% heavier than a tonne; the US short ton is 2,000 lb = 907.18 kg, about 9% lighter. In everyday British usage "tonne" and the metric value are what people mean, but shipping, older engineering and US sources may intend a long or short ton — worth checking on any spec sheet. For the forces those masses exert under gravity, see the force converter.

What are the most common mass conversions?

The table below covers the mass conversions people look up most, from body weight to bulk loads. Every figure is produced by the same converter above, so you can reproduce any row by typing the source value into its field.

Mass and weight are used interchangeably in everyday speech, but strictly, mass is the amount of matter (in kilograms) while weight is the force gravity exerts on it (in newtons). On Earth the two track each other, so a set of scales reading "70 kg" is really measuring the force of your mass under gravity and displaying the equivalent mass. If you need volumes of a substance from its mass, pair this with the density converter.