Convert ounces to grams instantly. Enter any avoirdupois ounce value and get the exact gram equivalent, plus the formula and a full reference table.
The conversion factor is derived from SI base values:
This uses avoirdupois ounces. 1 avoirdupois oz = 28.3495231 g (exact definition).
| Ounces (oz) | Grams (g) |
|---|---|
| 0.5 oz | 14.175 g |
| 1 oz | 28.350 g |
| 2 oz | 56.699 g |
| 4 oz | 113.40 g |
| 6 oz | 170.10 g |
| 8 oz | 226.80 g |
| 12 oz | 340.19 g |
| 16 oz | 453.59 g |
| 24 oz | 680.39 g |
| 32 oz | 907.18 g |
1 avoirdupois ounce equals 28.3495 grams. This is the standard ounce used for food and everyday goods, not the troy ounce (which equals 31.103 grams and is used for precious metals).
4 ounces equals 113.4 grams. Calculation: 4 × 28.3495 = 113.398 g, rounded to 113.4 g. This is also equal to one quarter pound.
Close but not exact. 100 g = 3.527 oz, while 4 oz = 113.4 g. So 4 oz is about 13% heavier than 100 g.
There are 16 avoirdupois ounces in 1 pound. So 1 lb = 16 oz = 453.592 g. This is why a 16 oz bag of food is also labeled as 1 lb.
The word "ounce" derives from the Latin "uncia," meaning one-twelfth. In the Roman system, an uncia was one-twelfth of a pound. Today the ounce is one-sixteenth of an avoirdupois pound.