How Many Ounces Are in a Pound?

There are exactly 16 avoirdupois ounces in one pound. One ounce is 28.349523125 grams and one pound is exactly 0.45359237 kilograms.

Watch out for the troy ounce

Precious metals are sold in troy ounces, which weigh 31.1034768 grams — about 10% more than an avoirdupois ounce. A troy pound contains only 12 troy ounces, so a troy pound is lighter than an ordinary pound despite the heavier ounce.

Fluid ounces are a volume

A fluid ounce measures volume, not weight, and does not convert to ounces of mass except for water by coincidence of definition. A US fluid ounce is 29.5735 mL; an Imperial fluid ounce is 28.4131 mL.

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