oz to grams formula
To convert ounces to grams, multiply the number of ounces by 28.349523125. In symbols: g = oz × 28.349523125.
One ounce equals 28.349523125 grams, and one gram equals 0.0352739619496 ounces. An avoirdupois ounce is exactly 1/16 of a pound, which makes it exactly 28.349523125 g.
Worked example
Suppose you have 8 ounces and need the answer in grams.
- Write the formula: g = oz × 28.349523125.
- Put in the number: 8 × 28.349523125 = 226.796185.
- Round to suit the job. 226.8 g is accurate enough for most everyday uses.
So 8 oz is 226.796185 g. To check, convert back: 226.796185 g is 8 oz.
Common ounces to grams values
| ounces (oz) | grams (g) |
|---|---|
| 1 | 28.34952313 |
| 2 | 56.69904625 |
| 5 | 141.7476156 |
| 10 | 283.4952313 |
| 20 | 566.9904625 |
| 50 | 1,417.476156 |
| 100 | 2,834.952313 |
Reference points
Some familiar amounts in ounces, converted to grams:
- 1 oz, a slice of bread: 28.3495 g
- 4 oz, a US stick of butter: 113.398 g
- 8 oz, a cup of water, about 8 oz: 226.796 g
- 16 oz, one pound: 453.592 g
Where you will use it
Recipes from the US, postal rates, jewelry and nutrition labels use ounces, while kitchen scales and most of the world use grams. Baking needs weight, not volume, to be accurate.
Quick mental math
Use 28 for a quick mental estimate, or 30 when speed matters more than precision. Rule of thumb: multiply by 28. For 8 oz this gives 224 g against the exact 226.8, an error of 1.2 percent.
Going the other way
Need the reverse? Use the grams to oz converter. For comparison, 1 g is 0.035273962 oz. To compare every weight unit at once, open the weight converter.
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