Ounce to Gram
Convert ounce (oz) to gram (g) instantly. Move between metric and imperial weights instantly.
Ounce → Gram
28.3495
g
1 oz = 28.3495 g
Frequently asked questions
28.349523125 grams for the avoirdupois ounce used in cooking and general weight. Multiply ounces by 28.3495 to get grams.
A stick is 4 ounces, which is 113.4 grams. American recipes specify butter in sticks constantly, and half a stick is 2 oz or about 57 grams. A full pound of butter is four sticks, or 453.6 grams.
Because they measure different things — ounces are mass, fluid ounces are volume. Dry ingredients are given by weight and liquids by volume. The two coincide only for water, so 8 fl oz of milk is about 237 ml while 8 oz of chocolate is 227 grams. Treating them as interchangeable is the most common way a converted recipe fails.
Multiply by 28.3495
An avoirdupois ounce is 28.349523125 grams, so converting to grams is a single multiplication.
Grams = ounces × 28.3495
The conversion that saves a recipe
American recipes weigh dry ingredients in ounces and measure liquids in fluid ounces or cups, while Indian kitchens work in grams and millilitres. Getting the conversion right is the difference between a cake that works and one that does not.
Useful equivalents for baking:
- 1 oz = 28.35 g
- 2 oz = 56.7 g
- 4 oz = 113.4 g — a quarter pound, and a common butter quantity
- 8 oz = 226.8 g
- 12 oz = 340.2 g
- 16 oz = 453.6 g — one pound
Note that a stick of American butter is 4 oz, or 113 grams, which is worth knowing because recipes specify butter that way constantly.
Ounces by weight versus fluid ounces
The single most consequential distinction in recipe conversion.
Ounce (oz) is a unit of mass. Fluid ounce (fl oz) is a unit of volume. A recipe calling for 8 oz of chocolate means 227 grams by weight; one calling for 8 fl oz of milk means about 237 ml.
They coincide only for water, and only approximately. Eight fluid ounces of flour weighs about 4.2 ounces, because flour is roughly half the density of water — so treating the two as interchangeable nearly doubles the flour in a recipe.
The two fluid ounces differ from each other too: US fl oz = 29.574 ml, imperial fl oz = 28.413 ml. An American recipe and a British one calling for the same number of fluid ounces are asking for different amounts.
The troy ounce
Precious metals use a heavier ounce: the troy ounce at 31.1035 grams, about 10% more than the avoirdupois ounce.
Gold, silver and platinum are quoted internationally per troy ounce. Indian jewellery is priced per gram, or historically per tola (11.6638 g). Converting a dollar-per-troy-ounce gold quote to a rupee-per-gram figure means dividing by 31.1035, applying the exchange rate, and then accounting for import duty and GST — which is why the Indian retail price sits meaningfully above the naive conversion.
Using 28.35 instead of 31.1035 on a gold calculation overstates the per-gram price by about 10%.
A mental approximation
Multiply by 28, or by 30 and take a little off. For 6 ounces: 6 × 28 = 168 g against an exact 170.1. Close enough for cooking, not for chemistry.