Convert between milligrams, grams, kilograms, ounces, pounds and stones using exact international mass factors.
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1 kg is about 2.20462262 lb, and 16 ounces is exactly 453.59237 g. A person weighing 70 kg is about 11.02311311 stone, and 150 lb is exactly 68.0388555 kg.
Every value is converted through kilograms. The international pound is defined as exactly 0.45359237 kg, the avoirdupois ounce is one sixteenth of that at 28.349523125 g, and the stone is exactly 14 pounds, so the factors are exact rather than approximate.
These are units of mass, even though everyday language calls them weight. The ounces here are avoirdupois ounces for food and everyday goods, not troy ounces, and fluid ounces measure volume rather than mass, so they belong in a volume or cooking converter instead.
Values are converted through kilograms. The international pound is defined as exactly 0.45359237 kg, and the avoirdupois ounce is one sixteenth of that, 28.349523125 g. So 16 ounces is exactly 453.59237 g, and 150 lb is exactly 68.0388555 kg. In the other direction, 1 kg is about 2.20462262 lb and 500 g is about 17.63698097 oz. The results are mass units, even though everyday language calls them weight.
The stone, still common for body weight in the UK and Ireland, is exactly 14 pounds. A person weighing 70 kg is about 11.02311311 stone. The decimal part of a stone is not pounds: multiply 0.02311311 by 14 to get about 0.32 lb, so 70 kg is roughly 11 st 0.3 lb. Scales that display stones and pounds do this split automatically, which is why a converted decimal can look different from the reading on a bathroom scale.
This converter uses avoirdupois ounces for food and everyday goods. Precious metals are priced in troy ounces of 31.1034768 g, about 10% heavier, so do not use these results for gold or silver prices. Fluid ounces measure volume, not mass, and belong in the Volume or Cooking Converter; how much a fluid ounce weighs depends on the ingredient. For kitchen recipes that list flour or sugar in cups, weigh a cup of that ingredient rather than assuming a standard mass.
| Input | Result |
|---|---|
1 kg → lb | 2.20462262 |
1 st → lb | 14 |
70 kg → st | 11.02311311 |
150 lb → kg | 68.0388555 |
16 oz → g | 453.59237 |
500 g → oz | 17.63698097 |
Because a stone is 14 pounds, not 10 or 100. 70 kg converts to about 11.02311311 stone, and multiplying 0.02311311 by 14 gives roughly 0.32 lb, so the reading is about 11 st 0.3 lb. Bathroom scales split stones and pounds automatically, which is why a plain decimal looks different.
No. Precious metals are priced in troy ounces of 31.1034768 g, about 10% heavier than the avoirdupois ounce used here, so never apply these results to gold or silver prices. For food, packaging and postage, the avoirdupois ounce is the right one, and 500 g is about 17.63698097 oz.
Yes for anything given by mass: grams, kilograms, ounces and pounds all convert exactly. Cups and spoons are volume, so a cup of flour and a cup of sugar do not weigh the same; weigh the ingredient itself rather than assuming a standard mass per cup.