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Weight Conversion.
Convert between pounds, kilograms, ounces, grams, stones, metric tons, short tons, troy ounces, and carats.
Convert between pounds, kilograms, ounces, grams, stones, metric tons, and more. These converters handle everyday weights, body weight in different regional standards, and precision measurements down to milligrams.
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Weight and mass conversions
The most common weight conversion is pounds to kilograms: multiply pounds by 0.4536, or divide by 2.205. The UK and Ireland use stones for body weight, where 1 stone equals 14 pounds or 6.35 kilograms. For smaller measurements, 1 ounce equals 28.35 grams, which is useful for cooking and postal scales.
Common questions about weight conversions
How do I convert pounds to kilograms?
Multiply pounds by 0.4536 to get kilograms. For example, 150 pounds is 68.04 kg, and 200 pounds is 90.72 kg. For a quick mental estimate, divide pounds by 2 and subtract 10%. So 180 lbs divided by 2 is 90, minus 9, gives you roughly 81 kg (actual: 81.65 kg).
What is a stone in pounds?
One stone equals exactly 14 pounds (6.35 kg). Stones are commonly used in the UK and Ireland for body weight. A person weighing 154 pounds is 11 stone, and 170 pounds is 12 stone 2 pounds. To convert stones to pounds, multiply by 14 and add any remaining pounds.
How many grams are in an ounce?
One avoirdupois ounce (the standard ounce for everyday use) equals 28.3495 grams. Note that a troy ounce, used for precious metals like gold, is heavier at 31.1035 grams. To convert grams to ounces, divide by 28.35. A 100-gram chocolate bar weighs about 3.53 ounces.