Grams to ounces converter

The formula

The ounce in US and UK kitchens is the avoirdupois ounce, one sixteenth of a pound. Since 1959 the pound has been defined as exactly 0.45359237 kg, which NIST Handbook 44 lists, so the ounce is exactly 453.59237 / 16 = 28.349523125 g.

ounces = grams / 28.349523125

grams = ounces x 28.349523125

Rounded for the kitchen: 1 oz is about 28 g, 4 oz about 113 g, 8 oz about 227 g and 16 oz (1 lb) about 454 g. NIST's metric kitchen table uses the same rounded figures.

Weight ounces and fluid ounces are different units

An ounce (oz) is a weight. A fluid ounce (fl oz) is a volume, about 29.6 mL in the US. They only line up for water and similar liquids, where 1 US fl oz weighs about 29.6 g against 28.3 g for 1 oz. For anything else, such as honey or flour, a fluid ounce and a weight ounce are far apart. If your recipe says "8 oz" next to a liquid, check whether it means fluid ounces; the ml to fluid ounces converter handles those.

Common conversions

Pounds and ounces

Packaged food in the US is often labelled in pounds and ounces together. The converter shows both when you convert to pounds: 500 g is 1.1 lb, which is 1 lb 1.6 oz. A kilogram is 2.2 lb, or 2 lb 3.3 oz.

Rounding on a kitchen scale

A kitchen scale that reads to 1 g in metric mode often reads to 0.1 oz in imperial mode. A 0.1 oz step is 2.8 g, so the gram setting is nearly three times finer. For small amounts such as yeast, salt or baking powder, weighing in grams gives the better reading.