Convert Ounces to Grams
1 ounce is 28.35 g. One ounce is exactly 28.349523125 grams.
One ounce is 28.349523 grams. To convert ounces to grams, multiply by 28.349523; to go the other way, divide by 28.349523 or multiply by 0.035273962. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 44. One sixteenth of a pound.
Factor checked against the defining standard · How we check
- Ounces × 28.349523
1 * 28.34952328.35 g
1 ounce in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces (as entered) | 1 oz | — |
| pounds | 0.0625 lb | × 0.0625 |
| stone | 0.004464285714 st | × 0.00446428571429 |
| US tons | 0.00003125 ton | × 0.00003125 |
| micrograms | 28,349,523.13 mcg | × 28,349,523.125 |
| milligrams | 28,349.52313 mg | × 28,349.523125 |
| centigrams | 2,834.952313 cg | × 2,834.9523125 |
| grams | 28.34952313 g | × 28.349523125 |
| kilograms | 0.02834952313 kg | × 0.028349523125 |
| slugs | 0.001942559386 slug | × 0.00194255938572 |
| tonnes | 0.00002834952313 t | × 0.000028349523125 |
| carats | 141.7476156 ct | × 141.747615625 |
| troy ounces | 0.9114583333 ozt | × 0.911458333333 |
| grains | 437.5 gr | × 437.5 |
| long tons | 0.00002790178571 LT | × 0.0000279017857143 |
Factors are entered by hand from NIST Handbook 44 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert ounces to grams? The converter and the working
- 1.Take the measurement in ounces.
- 2.Multiply by 28.349523 — that is how many grams fit in one ounce.
- 3.To go back the other way, divide by 28.349523, or multiply by 0.035273962.
Worked example: 25 ounces to grams
- Formula
- oz × 28.349523 = g
- Arithmetic
- 25 × 28.349523 = 708.74 g
- Answer
- 25 oz = 708.74 g
The factor is rounded for display; the figure above is computed from the full value.
Ounces to grams conversion table
| Ounces | Grams |
|---|---|
| 1 oz | 28.35 g |
| 2 oz | 56.7 g |
| 3 oz | 85.05 g |
| 4 oz | 113.4 g |
| 5 oz | 141.75 g |
| 6 oz | 170.1 g |
| 7 oz | 198.45 g |
| 8 oz | 226.8 g |
| 9 oz | 255.15 g |
| 10 oz | 283.5 g |
| 12 oz | 340.19 g |
| 15 oz | 425.24 g |
| 20 oz | 566.99 g |
| 25 oz | 708.74 g |
| 50 oz | 1,417.48 g |
| 100 oz | 2,834.95 g |
| 200 oz | 5,669.9 g |
| 300 oz | 8,504.86 g |
| 500 oz | 14,174.76 g |
| 1000 oz | 28,349.52 g |
| 2000 oz | 56,699.05 g |
| 5000 oz | 141,747.62 g |
| 10000 oz | 283,495.23 g |
A troy ounce is not an ounce
The ordinary avoirdupois ounce is 28.349523125 grams and is what this page converts. Precious metals are weighed in troy ounces of 31.1034768 grams — ten per cent heavier — and a troy pound is twelve troy ounces rather than sixteen. A gold price "per ounce" always means the troy ounce.
NIST Handbook 44, Appendix C — general tables of units of measurement
What is an ounce?
One sixteenth of a pound. Not to be confused with the fluid ounce, which measures volume.
What is a gram?
One thousandth of a kilogram, and the unit nutrition labels use worldwide.
How many grams are in an ounce?
One ounce is 28.349523 grams. Going the other way, one gram is 0.035273962 ounces. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every weight unit here
The whole group — 15 units with their symbols and the size of each one in kilograms — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to an ounce.
Cite this page
- APA
- Rule Calculator. (2026). Convert Ounces to grams. Rule Calculator. https://rulecalculators.com/convert/ounce-to-gram
- MLA
- "Convert Ounces to grams." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/ounce-to-gram.
- Chicago
- Rule Calculator. "Convert Ounces to grams." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/ounce-to-gram.
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Questions people actually ask
- How many grams are in an ounce?
- 28.349523. One thousandth of a kilogram, and the unit nutrition labels use worldwide.
- How do I convert grams back to ounces?
- Divide by 28.349523, or multiply by 0.035273962 — they are the same operation.
Other weight conversions
Grams to ounces — the same conversion the other way.