How many grams is 1 ounce?

1 ounce is 28.35 grams. Most recipes round to 28 grams for simple math.

How many grams is 4 ounces?

4 ounces is 113 grams. This is also the weight of 1 US stick of butter or a quarter pound of any food.

How many grams is 8 ounces?

8 ounces is 227 grams. This is half a pound, or 2 US sticks of butter.

Is a fluid ounce the same as an ounce?

No. An ounce is weight. A fluid ounce is space. They share a name but they measure different things. For water they are almost the same number, but for other foods they are different.

How many ounces in 100 grams?

100 grams is 3.53 ounces. Most recipes round to 3.5 ounces.

Ounces to grams converter

US recipes often give weight in ounces. Metric recipes give weight in grams. The two are simple to swap once you know the number. This tool does the math both ways, and the chart below lists the most common values.

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Common ounce to gram amounts

Weights you will see in cooking, with both units:

1 oz = 28.35 g
2 oz = 57 g
3 oz = 85 g
4 oz = 113 g (a quarter pound, also 1 US stick of butter)
5 oz = 142 g
6 oz = 170 g
8 oz = 227 g (half a pound)
10 oz = 283 g
12 oz = 340 g (three-quarter pound)
16 oz = 454 g (one pound)
24 oz = 680 g
32 oz = 907 g (2 pounds)

How the conversion works

1 ounce is 28.3495 grams. To go from ounces to grams, multiply by 28.35. To go from grams to ounces, divide by 28.35.

The tool above does the math live. Type ounces and grams updates. Type grams and ounces updates.

Ounces of weight, not ounces of liquid

An ounce is a unit of weight. A fluid ounce is a unit of space. They share a name but they are different things.

For water, 1 fluid ounce weighs about 1 ounce, by chance. For other foods, the two numbers are different. Honey is heavier per fluid ounce. Oil is lighter. Always check whether your recipe means weight or fluid.

Other weight units to know

1 pound is 16 ounces or 454 grams. 1 kilogram is 1000 grams or 2.2 pounds. Most kitchen scales switch between ounces and grams with one button. Pounds rarely show up in baking; recipes usually give either ounces or grams.

Common ounce and gram mistakes

Confusing ounces (weight) with fluid ounces (space). 1 fluid ounce of honey weighs about 1.4 ounces.
Using one cup of food as one weight ounce. Cups measure space, not weight. They are not the same.
Rounding 1 ounce to 30 grams. The real value is 28.35. The 6 percent difference adds up in a recipe with several ounces of an ingredient.
Mixing US weight ounces with troy ounces (used for precious metals). Troy ounces are heavier, but they do not appear in cooking.

FAQ

How many grams is 1 ounce?: 1 ounce is 28.35 grams. Most recipes round to 28 grams for simple math.
How many grams is 4 ounces?: 4 ounces is 113 grams. This is also the weight of 1 US stick of butter or a quarter pound of any food.
How many grams is 8 ounces?: 8 ounces is 227 grams. This is half a pound, or 2 US sticks of butter.
Is a fluid ounce the same as an ounce?: No. An ounce is weight. A fluid ounce is space. They share a name but they measure different things. For water they are almost the same number, but for other foods they are different.
How many ounces in 100 grams?: 100 grams is 3.53 ounces. Most recipes round to 3.5 ounces.

Where the number 28.35 comes from

1 ounce is defined as exactly 28.349523125 grams. The pound is defined as exactly 0.45359237 kilograms, or 453.59237 grams. There are 16 ounces in a pound, so 453.59 divided by 16 is 28.35.

Last updated: May 11, 2026