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Ounces to Grams (oz to g)

1 ounce is exactly 28.349523125 grams, so 8 oz is 226.8 g and 4 oz is 113.4 g. Paste a whole ingredient list to convert it at once.

Grams to ounces
Convert a list of values

1 oz =

28.35 g

Exact
28.349523125 g
pounds
0.0625 lb
kilograms
0.02835 kg

grams = ounces × 28.349523125

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How to convert ounces to grams

Multiply the ounces by 28.349523125:

grams = ounces × 28.349523125

8 oz × 28.349523125 = 226.796185 g, or 226.8 g. Kitchen scales show whole grams, so round to 227 g. To go the other way, divide grams by the same number, or use the grams to ounces converter.

The factor comes from the pound: 1 lb = 0.45359237 kg exactly and 1 lb = 16 oz, so 1 oz = 453.59237 g ÷ 16 = 28.349523125 g. NIST lists it as an exact value (Handbook 44, Appendix C).

Ounces to grams chart for cooking

Ounces Grams (exact) Grams (rounded)
1/4 oz 7.087 g 7 g
1/2 oz 14.17 g 14 g
1 oz 28.35 g 28 g
2 oz 56.7 g 57 g
3 oz 85.05 g 85 g
3.5 oz 99.22 g 99 g
4 oz (1/4 lb) 113.4 g 113 g
5 oz 141.75 g 142 g
6 oz 170.1 g 170 g
8 oz (1/2 lb) 226.8 g 227 g
10 oz 283.5 g 284 g
12 oz (3/4 lb) 340.19 g 340 g
14 oz 396.89 g 397 g
16 oz (1 lb) 453.59 g 454 g
24 oz (1.5 lb) 680.39 g 680 g
32 oz (2 lb) 907.18 g 907 g

For a whole recipe, open Convert a list of values, paste the ounce amounts one per line, and copy or download the grams. A 3.5 oz bar is 99.2 g: close to 100 g, but not the same.

Is an ounce 28 or 30 grams?

Both are shortcuts. For 8 oz:

Shortcut 8 oz gives Error
× 28.35 (exact to 0.002%) 226.8 g —
× 28 224 g −1.2%
× 30 240 g +5.8%

28 g per ounce is fine for cooking. 30 g makes a pound weigh 480 g instead of 454 g, enough to throw off bread dough or a coffee ratio.

Ounces vs. fluid ounces

Recipes use oz for weight (butter, flour, cheese) and fl oz for volume (milk, stock, oil). A fluid ounce is 29.57 mL; only for water does it weigh close to 29.6 g. If the recipe says fl oz or the ingredient is a liquid measured in a cup, convert it with ounces to milliliters instead. For pounds and ounces together, the ounces to pounds converter shows both.

Troy ounces

Gold, silver and platinum are priced per troy ounce: 31.1034768 g, about 10% heavier than the 28.35 g avoirdupois ounce. This converter uses the avoirdupois ounce, the one on food labels, postal scales and bathroom scales.

Frequently asked questions

How many grams are in an ounce?

Exactly 28.349523125 grams. The ounce is defined as 1/16 of the international pound of 0.45359237 kg, so the value is exact and never changes. 28.35 g is accurate to 0.002%.

How many grams is 8 oz?

226.8 grams (226.796185 g exactly). That is half a pound — two U.S. sticks of butter weigh 8 oz, or about 227 g.

Is an ounce 28 or 30 grams?

Neither: it is 28.35 g. Rounding to 28 g is 1.2% low, close enough for cooking. Rounding to 30 g is 5.8% high, which adds up — 16 oz becomes 480 g instead of 454 g.

How many grams is 4 oz?

113.4 grams. A quarter pound (4 oz) is 113.4 g, and 12 oz is 340.2 g.

Is a fluid ounce 28 grams?

No. A U.S. fluid ounce is a volume of 29.57 mL; it weighs about 29.6 g only if the liquid is water. Milk, oil and honey weigh more or less per fluid ounce, so use a volume converter for liquids measured in fl oz.

How many grams is a troy ounce?

31.1034768 grams. Troy ounces are used only for gold, silver and other precious metals; everyday weights use the avoirdupois ounce of 28.35 g.

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