Ounces to Grams Converter

One (everyday, avoirdupois) ounce is 28.3495 grams. Most people meet this conversion in the kitchen, converting a US recipe to metric, or at the post office working out a postage band. The number to remember is “about 28 g”, and “a quarter-pound is about 113 g”.

Kitchen and postage quantities

A large egg is roughly 2 oz (57 g) in the shell. A stick of US butter is 4 oz (113 g). A medium apple is about 5-7 oz. For post, letter bands often step at 1 oz (28 g), 2 oz (57 g) and 3.5 oz (99 g). A dollar bill weighs about 0.035 oz, so roughly 28 of them make an ounce.

Ounces to grams table

The troy ounce trap

If you are pricing gold, silver or other precious metals, the “ounce” quoted is a troy ounce – 31.1035 g, about 10% heavier than the kitchen ounce. This converter uses the avoirdupois ounce for food and everyday goods. For weights above a pound, switch to pounds to kg or the weight converter; for volume measures in a recipe (cups, tablespoons) the cooking converter accounts for ingredient density.