ounces to grams converter
1 oz = 28.349523125 g. Type a value in either box — the other side updates instantly, using the exact definition factor, not a rounded shortcut. One avoirdupois ounce is exactly 28.349523125 grams — the definition this converter uses for every row.
Rate: 1 oz = 28.349523125 g · 1 g = 0.0352739619 oz
Formula and a worked example
grams = ounces × 28.349523125. Worked example: 8 oz × 28.349523125 = 226.796185 g. To go back, divide by the same factor (or multiply by 0.0352739619).
Where the factor comes from: The avoirdupois ounce is exactly one sixteenth of a pound: 28.349523125 grams. Factors on UnitPairs follow the NIST definitions, so results agree between pages to the last digit shown.
ounces to grams chart
| ounces (oz) | grams (g) |
|---|---|
| 1 | 28.349523 |
| 2 | 56.699046 |
| 4 | 113.398093 |
| 8 | 226.796185 |
| 12 | 340.194277 |
| 16 | 453.59237 |
| 32 | 907.18474 |
Questions
How many grams are in one ounce?
Exactly 28.349523125 g — that is the rate this converter applies in both directions.
How do I convert oz to g by hand?
Multiply the ounces value by 28.349523125. For a rough mental estimate, 28.35 is usually close enough — but use the full factor for anything you plan to build, buy or dose.
How accurate is this converter?
The factors are the exact international definitions, so the only rounding is in the display — results are shown to six decimal places, and the underlying value is never pre-rounded.
Related conversions
- grams to ounces — the reverse of this page
- kilograms to pounds
- pounds to kilograms
- grams to ounces
- kilograms to stone
- Height converter — centimetres to feet and inches
- Full conversion chart — every pair on one page