OZ to Grams Converter

How to convert ounces to grams

1 ounce = 28.34952313 grams. To convert ounces to grams, multiply by 28.34952313. An avoirdupois ounce is 1/16 of a pound, exactly 28.349523125 g. A gram is one thousandth of a kilogram.

Worked examples

• 1 ounce = 28.3495 g (1 × 28.349523)
• 4 ounces = 113.398 g (4 × 28.349523)
• 8 ounces = 226.796 g (8 × 28.349523)

Where this conversion comes up

Ounces are used for food packaging, postage and baby weight in the US; grams for food labels, baking scales and jewelry. An ounce is exactly 28.349523125 g, so 4 oz (a quarter pound) is 113.4 g and 8 oz (half a pound) is 226.8 g.

Quick estimate

Multiply by 28 (1.2% low): 6 oz ≈ 168 g, exact 170.1 g.

Common mistakes

• Dividing instead of multiplying. A gram is smaller than a ounce, so the number of grams must come out larger: 1 ounce = 28.3495 g.
• Rounding too early. Keep the full factor until the last step; rounding 28.3 to 28 first puts large values noticeably off.

Going the other way? Use the grams to ounces converter. Related weight converters: oz to lbs, lbs to oz, grams to pounds, pounds to grams, grams to kg, kg to stone.