One avoirdupois ounce is 28.349523125 grams exactly; for cooking, 28 g per ounce is close enough (28.35 g if you are weighing coffee or yeast). This is the conversion you need for American recipes on a metric kitchen scale, and for shipping weights and nutrition labels.
Where you'll meet this conversion
- A recipe calling for 8 oz of flour wants 227 g; a 4 oz stick of butter is 113 g.
- A 16 oz (1 lb) parcel weighs 454 g; postal rates often step at 500 g.
- An espresso dose of 0.63 oz is 18 g.
Common mistake
Confusing weight ounces with fluid ounces (a volume). 8 fl oz of water happens to weigh about 8.3 oz (237 g), but 8 fl oz of flour weighs only ~4.4 oz (125 g). Also note the troy ounce used for gold and silver is heavier: 31.1035 g.
Quick answer: one ounce equals 28.3495 grams. So to convert ounces to grams, multiply by 28.34952313.
How to convert ounces to grams
grams = ounces × 28.349523125
The avoirdupois ounce is exactly 28.349523125 grams. It dominates American recipe and food-label weights and is one sixteenth of a pound.
The gram is the metric everyday unit for cooking ingredients, letters and jewelry. Originally defined as the mass of a cubic centimeter of water.
Ounce to Gram conversion table
| Ounce (oz) | Gram (g) |
|---|---|
| 0.01 oz | 0.283495 g |
| 0.1 oz | 2.835 g |
| 0.25 oz | 7.0874 g |
| 0.4 oz | 11.3398 g |
| 0.75 oz | 21.2621 g |
| 1.25 oz | 35.4369 g |
| 1.75 oz | 49.6117 g |
| 2.5 oz | 70.8738 g |
| 3.5 oz | 99.2233 g |
| 4.5 oz | 127.5729 g |
| 6 oz | 170.0971 g |
| 8 oz | 226.7962 g |
| 10 oz | 283.4952 g |
| 12 oz | 340.1943 g |
| 14 oz | 396.8933 g |
| 16 oz | 453.5924 g |
| 18 oz | 510.2914 g |
| 20 oz | 566.9905 g |
| 24 oz | 680.3886 g |
| 26 oz | 737.0876 g |
| 30 oz | 850.4857 g |
| 35 oz | 992.2333 g |
| 45 oz | 1,275.73 g |
| 55 oz | 1,559.22 g |
| 65 oz | 1,842.72 g |
| 75 oz | 2,126.21 g |
| 85 oz | 2,409.71 g |
| 95 oz | 2,693.2 g |
| 110 oz | 3,118.45 g |
| 125 oz | 3,543.69 g |
| 175 oz | 4,961.17 g |
| 250 oz | 7,087.38 g |
| 350 oz | 9,922.33 g |
| 450 oz | 12,757.29 g |
| 600 oz | 17,009.71 g |
| 750 oz | 21,262.14 g |
| 900 oz | 25,514.57 g |
| 1,500 oz | 42,524.28 g |
| 2,500 oz | 70,873.81 g |
| 10,000 oz | 283,495.23 g |
Need the opposite direction? Use the Gram to Ounce converter, or read our complete guide to weight conversions for every formula in one place.
Full guide: Ounces to Grams: 1 oz = 28.35 g (Formula, Chart and Examples) — where the factor comes from, worked examples and the mistakes people make.
Frequently asked questions
How many grams are in one ounce?
One ounce equals 28.3495 grams. Multiply any ounce value by 28.34952313 to get grams.
What is 10 ounces in grams?
10 ounces equal 283.4952 grams (10 × 28.349523).
Is the ounce to gram conversion exact?
The conversion factor used here (28.349523125) is based on the internationally agreed definitions of both units, so results are exact up to rounding of the final decimal places.
Is my data stored when I use this converter?
No. The conversion runs entirely in your browser with JavaScript — nothing you type is sent to a server, logged or stored.