Ounces to Grams
Result:
Enter a weight to convert.
Convert ounces to grams. From is set to ounces and To is set to grams. The result updates as you type. One avoirdupois ounce is exactly 28.349523125 grams. This is not a troy ounce. Other units are on the weight converter. The other direction is grams to ounces.
Ounces to grams formula
One pound is 16 avoirdupois ounces, and one pound is 0.45359237 kg exactly, so 1 ounce = 28.349523125 grams. NIST Handbook 44 (2024), Appendix C lists that same ounce.
Formula: grams = ounces × 28.349523125.
The converter multiplies by that exact ounce, then rounds the displayed result to five decimal places.
Example: 1 oz is exactly 28.349523125 g. The converter shows 28.34952 g.
Ounces to grams reference table
Each value below is the converter result at five decimal places, using the avoirdupois ounce of 28.349523125 grams. Enter the same ounces in the form above and the result should match.
| Ounces | Grams |
|---|---|
| 0.5 | 14.17476 |
| 1 | 28.34952 |
| 2 | 56.69905 |
| 3 | 85.04857 |
| 4 | 113.39809 |
| 6 | 170.09714 |
| 8 | 226.79619 |
| 10 | 283.49523 |
| 12 | 340.19428 |
| 16 | 453.59237 |
| 32 | 907.18474 |
Ounces to grams examples
Cooking: An 8 oz block of cheese is 226.79619 g, exactly half a pound.
Meat: A 4 oz portion, a quarter pound, is 113.39809 g.
Packaged food: A 16 oz package is 453.59237 g, which is exactly one pound.
Quick mental math (approximation)
To estimate grams, multiply the ounces by 28. Example: 8 oz × 28 is about 224 g. The exact result is 226.79619 g.
This shortcut is an approximation. It runs about 1.2 percent low. Multiplying by 30 is easier but runs about 6 percent high. Use the converter or the exact formula when the number goes on a label, form, or record.
Ounces to grams FAQ
How many grams are in an ounce?
One avoirdupois ounce is exactly 28.349523125 grams. The converter rounds that to five decimal places and shows 28.34952 g.
Are these the same as fluid ounces?
No. This page converts avoirdupois ounces, a unit of weight. A fluid ounce measures volume, so turning fluid ounces into grams depends on the density of the ingredient.
Does this work for gold or silver?
No. Precious metals are weighed in troy ounces. One troy ounce is exactly 31.1034768 grams, which is heavier than the 28.349523125-gram ounce used here.