oz to grams converter

How to convert ounces to grams

The ounce on this page is the avoirdupois ounce, exactly 1/16 of the international pound. That is 0.028349523125 kg, or 28.349523125 grams. Multiplying ounces by 28.349523125 gives grams. One ounce is 28.350 grams at three decimals. It is not 30, and it is not the troy ounce of 31.1034768 g used for gold. It is also not a fluid ounce, which is a volume and depends on whether you mean the US or the UK fluid ounce.

Kitchen scales, postage, and yarn. A 4 oz portion is 113.398 g. Sixteen ounces is the pound, 453.59237 g, and that has to match the pounds page or the factors have drifted. Postal ounces in the US are this ounce.

Exact formula

Formulagrams = ounces × 28.349523125

grams = ounces × 28.349523125 One oz is 28.349523125 g. Ten oz is 283.49523125 g. The worked example below uses that same conversion.

Conversion table

The ounces column runs from 0.5 oz (14.175 g) through 160 oz (4535.92 g).

Worked example: Ounces to Grams

One avoirdupois ounce is 28.35 g. The exact factor is 28.349523125 g, a sixteenth of the international pound. Cooks who use 30 g per ounce are estimating. Eight ounces, a common portion, is 226.8 g. Sixteen ounces must be 453.59 g, one pound, or this page has drifted from the pounds page. A fluid ounce of water is near 30 g and is still a volume. A troy ounce for bullion is about 31.103 g. Neither is the result here.

Pitfalls for ounces to grams

• Fluid ounces measure volume. A fluid ounce of water is near 30 g, which is why the two get confused, and it is not this factor.
• The troy ounce is about 31.103 g. Bullion priced per ounce is troy unless it says avoirdupois.
• 30 g per ounce is a cook's estimate. Nutrition labels that convert legally use 28.3495.
• UK and US weight ounces are the same avoirdupois ounce. Their fluid ounces are not the same.