Calculators & everyday math
Ounces, Pounds, and Stone Explained
Ounces, pounds, and stone belong to one family of units, but they are divided unevenly — 16 ounces to a pound and 14 pounds to a stone. This guide shows how they fit together, how body weight in stone converts to kilograms, and two units that are easy to confuse with them.
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How they fit together
| Unit | Equals | In grams |
|---|---|---|
| 1 ounce | 1/16 pound | 28.349523125 |
| 1 pound | 16 ounces | 453.59237 |
| 1 stone | 14 pounds | 6,350.29318 |
Body weight in stone
In the UK and Ireland, body weight is often given in stone and pounds. Convert the stone to pounds first, add the extra pounds, then convert: 11 st 7 lb is 11 × 14 + 7 = 161 lb, which is 73.02837157 kg.
Troy ounces are heavier
Gold, silver, and other precious metals are weighed in troy ounces of 31.1034768 grams — about 10% more than the everyday avoirdupois ounce of 28.349523125 grams. The Weight Converter uses the everyday ounce.
Fluid ounces measure volume
A fluid ounce is a unit of volume, not weight. A US fluid ounce of water weighs about 1.04 ounces, but a fluid ounce of oil or flour weighs a different amount, so the two can’t be swapped without knowing the density.
Ounces, Pounds, and Stone FAQ
- How many ounces are in a pound?
- 16.
- How many pounds are in a stone?
- 14.
- What is 10 stone in kilograms?
- 10 stone is 140 pounds, which is 63.5029318 kg.
- Is a fluid ounce the same as an ounce?
- No. A fluid ounce measures volume and an ounce measures weight.
- Why is stone still used?
- It is a traditional unit that remains common for body weight in the UK and Ireland, even though most other measurements there are metric.
Related guides
- Pounds vs. KilogramsThe exact pound-to-kilogram definition, mental shortcuts in both directions, a table of common weights, and the difference between mass and weight.
- Tonnes vs. TonsWhy a ton can mean 2,000, 2,204.6, or 2,240 pounds, how much the metric tonne, US short ton, and UK long ton differ, and where each is used.
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