Instant Unit Conversion
Convert Ounces to Grams (oz to g)
Exact formula, conversion factors, live calculator, and reference charts for ounces to grams.
Method reviewed:Exact defined factors — international yard and pound (1959), US customary gallon and cup, SI — the values NIST SP 811 lists · reviewed September 2026
1 ounce is equal to exactly 28.349523125 grams. To convert ounces to grams, multiply by 28.349523125.
Live Ounces to Grams Calculator
g = oz × 28.349523125Open full mass converter →Ounces to Grams Conversion Table
Quick reference conversion chart from 1 to 100 ounces.
| Ounces (oz) | Grams (g) | Mathematical Formula |
|---|---|---|
| 1 oz | 28.3495 g | 1 × 28.3495 |
| 2 oz | 56.699 g | 2 × 28.3495 |
| 5 oz | 141.7476 g | 5 × 28.3495 |
| 10 oz | 283.4952 g | 10 × 28.3495 |
| 15 oz | 425.2428 g | 15 × 28.3495 |
| 20 oz | 566.9905 g | 20 × 28.3495 |
| 25 oz | 708.7381 g | 25 × 28.3495 |
| 50 oz | 1,417.4762 g | 50 × 28.3495 |
| 75 oz | 2,126.2142 g | 75 × 28.3495 |
| 100 oz | 2,834.9523 g | 100 × 28.3495 |
Frequently Asked Questions
How many grams is 8 ounces?
8 ounces is 226.8 grams. Half a US pound, and the weight a stick of butter is sold at in the US.
Why is the ounce such an awkward number of grams?
Because it was not defined from the gram. The 1959 international yard and pound agreement fixed the pound at exactly 0.45359237 kg, and the ounce is a sixteenth of that.
Should I round 28.35 to 28 when cooking?
For most baking, yes. The error is about 1.2%, well inside the tolerance of a domestic scale. For anything where a few grams matter, use the exact figure.