Convert weights between kg, pounds, stone and ounces - plus troy units for precious metals - all from the exact legal definition of the pound, not an approximation.
| From | Equals |
|---|---|
| 1 pound | 0.45359237 kg |
| 1 kilogram | 2.204622622 lb |
| 1 ounce | 28.34952313 g |
| 1 gram | 0.03527396195 oz |
| 1 stone | 6.35029318 kg |
| 1 ton (us short) | 907.18474 kg |
| 1 tonne (metric) | 2204.622622 lb |
| 1 ounce (troy) | 31.1034768 g |
Every value in this table is computed by the same conversion engine as the tool above - not typed in by hand - so the tool and the table can never disagree.
The same 1959 international agreement that fixed the inch also defined the avoirdupois pound as exactly 0.45359237 kilograms. Every ounce (1/16 lb), stone (14 lb), US short ton (2,000 lb), and UK long ton (2,240 lb) follows exactly from it. The grain - the oldest unit in the system - is defined as 1/7000 of a pound, and it's the one unit shared between the everyday (avoirdupois) system and the troy system used for precious metals.
A troy ounce (used for gold and silver prices) is 480 grains ≈ 31.103 g, while the everyday avoirdupois ounce is 437.5 grains ≈ 28.350 g - so a troy ounce is about 10% heavier, even though a troy pound (12 troy oz) is lighter than a regular pound (16 oz). This converter includes both systems, plus the slug - the engineering mass unit defined so that 1 pound-force accelerates it at 1 ft/s². Strictly speaking, all of these are units of mass; "weight" in everyday speech means the same thing, which is how this page uses it.
About 2.20462. One kilogram is 2.2046226 pounds, so 70 kg is roughly 154 lb.
Fourteen. Stone is used mainly in the UK and Ireland for body weight, so 11 stone 4 pounds is 158 pounds, or about 71.7 kg.
Each of these has its own page with the exact factor, a reference table and the working shown. The converter above handles any of them too - these exist so the specific answer is one click rather than a search.