Convert Ounces to Grams
1 ounce (oz) equals 28.34952313 grams (g).
1 oz = 28.34952313 g
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk ounce to gram converter to paste a column from Excel.
How to Convert Ounce to Gram
- 1 oz = 28.34952313 g
- 1 g = 0.03527396195 oz
- Example: convert 8 oz to g: 8 oz = 8 × 28.34952313 g = 226.796185 g
Reference conditions. oz: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
g = oz × 28.349523125
Derivation from SI units:
- 1 oz = 1/16 lb = 28.349523125 g (exact)
- 1 g = 10⁻³ kg
- 1 oz = 0.028349523125 kg ÷ 0.001 kg per g = 28.349523125 g
Both units are defined exactly, so the factor is exact. Ounce definition: ounce; Gram definition: gram.
Worked examples
- An 8 oz steak weighs 226.796185 g.
8 oz × 28.34952313 = 226.796185 g - 16 oz (one pound) is 453.59237 g.
16 oz × 28.34952313 = 453.59237 g
Ounce to Gram conversion table
| Ounces (oz) | Grams (g) |
|---|---|
| 0.25 oz | 7.087380781 g |
| 0.5 oz | 14.17476156 g |
| 1 oz | 28.34952313 g |
| 2 oz | 56.69904625 g |
| 3 oz | 85.04856938 g |
| 4 oz | 113.3980925 g |
| 5 oz | 141.7476156 g |
| 6 oz | 170.0971388 g |
| 8 oz | 226.796185 g |
| 10 oz | 283.4952313 g |
| 12 oz | 340.1942775 g |
| 16 oz | 453.59237 g |
| 20 oz | 566.9904625 g |
| 24 oz | 680.388555 g |
| 32 oz | 907.18474 g |
| 64 oz | 1814.36948 g |
Where it's used
US recipes and nutrition facts in ounces are converted to grams for kitchen scales and metric labels. Multiply by 28.349523125.
Ounce to other weight and mass units
| Conversion | 1 oz equals |
|---|---|
| ounce to kilogram | 0.02834952313 kg |
| ounce to gram | 28.34952313 g |
| ounce to milligram | 28349.52313 mg |
| ounce to microgram | 28349523.13 µg |
| ounce to metric ton | 0.00002834952313 t |
| ounce to pound | 0.0625 lb |
| ounce to stone | 0.004464285714 st |
| ounce to short ton | 0.00003125 ton (US) |
| ounce to long ton | 0.00002790178571 ton (UK) |
| ounce to grain | 437.5 gr |
| ounce to troy ounce | 0.9114583333 oz t |
| ounce to carat | 141.7476156 ct |
Frequently asked questions
Is an ounce 28 grams?
Almost: 1 oz = 28.349523125 g exactly. Note that a troy ounce for gold is 31.1034768 g.
How many grams are in 1 ounce?
1 oz = 28.34952313 g.
How do I convert ounces to grams?
Multiply the value in oz by 28.34952313. For example, 8 oz × 28.34952313 = 226.796185 g.
Is the oz to g conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "ounce (avoirdupois) (oz)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Ounces to Grams. Retrieved October 17, 2026, from https://scientificconverters.com/mass/ounces-to-grams/
IEEE
Scientific Converters, "Convert Ounces to Grams," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/ounces-to-grams/