Ounces to Grams Converter
Convert ounces to grams and back. 1 ounce = 28.349523125 grams exactly.
Tip: Results show up to 8 significant digits. The factors and their sources are listed on the "Where our numbers come from" page.
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Ounces and Grams
One ounce is exactly 28.349523125 grams, and one gram is about 0.0352739619496 ounces. The converter works both ways: use the two tabs at the top of the tool to choose the direction.
Quick conversion table
Ounces to Grams
| Ounces | Grams |
|---|---|
| 0.5 oz | 14.174762 g |
| 1 oz | 28.349523 g |
| 2 oz | 56.699046 g |
| 3 oz | 85.048569 g |
| 4 oz | 113.39809 g |
| 6 oz | 170.09714 g |
| 8 oz | 226.79619 g |
| 10 oz | 283.49523 g |
| 12 oz | 340.19428 g |
| 16 oz | 453.59237 g |
| 32 oz | 907.18474 g |
| 64 oz | 1,814.3695 g |
Grams to Ounces
| Grams | Ounces |
|---|---|
| 10 g | 0.35273962 oz |
| 25 g | 0.88184905 oz |
| 50 g | 1.7636981 oz |
| 100 g | 3.5273962 oz |
| 125 g | 4.4092452 oz |
| 200 g | 7.0547924 oz |
| 250 g | 8.8184905 oz |
| 500 g | 17.636981 oz |
| 750 g | 26.455471 oz |
| 1,000 g | 35.273962 oz |
Exact factor and source
| Conversion | Value | Basis |
|---|---|---|
| 1 ounce in grams | 28.349523125 | exact. NIST SP 811 (2008), Appendix B.8: 1 oz (avoirdupois) = 28.349523125 g exactly (1/16 of the pound) |
| 1 gram in ounces | 0.0352739619496 | rounded to 12 digits. SI Brochure, 9th edition (BIPM 2019): 1 g = 0.001 kg (the kilogram is the SI base unit of mass) |
How to convert ounces to grams
- Step oneTake the number of ounces.
- Step twoMultiply it by 28.349523125.
- Step threeThe result is the number of grams.
- Step fourTo go back, divide by 28.349523125, or multiply by 0.0352739619496.
Example: 8 oz x 28.349523125 = 226.796185 g.
All weight units compared
Each unit written in grams, the base unit of this tool. Exact values come straight from the definitions.
| Unit | Symbol | Value in grams |
|---|---|---|
| Grams | g | 1 gram |
| Kilograms | kg | 1,000 grams |
| Ounces | oz | 28.349523125 grams |
| Pounds | lb | 453.59237 grams |
What is an ounce?
The ounce (oz) here is the avoirdupois ounce, exactly 28.349523125 grams, and 16 ounces make a pound. It is not the same as a fluid ounce, which measures volume.
What is a gram?
The gram (g) is one thousandth of a kilogram. Recipes and nutrition labels use grams for small amounts, and 28.349523125 grams make an ounce.
What this converter does not do
- Results are rounded for display to 8 significant digits; the stored factor is the exact one.
- It converts mass in avoirdupois units (the pound and ounce of everyday use), not troy ounces, which are used for precious metals.
- It does not convert between a weight and a volume, because that needs the density of the material.
Frequently asked questions
How many grams are in an ounce?
1 ounce is exactly 28.349523125 grams. That factor is exact by definition.
How many ounces are in a gram?
1 gram is about 0.0352739619496 ounces.
How many grams are in 8 ounces?
8 ounces is 226.79619 grams, which is half a pound (0.5 lb).
Where do the factors come from?
Ounces: NIST SP 811 (2008), Appendix B.8: 1 oz (avoirdupois) = 28.349523125 g exactly (1/16 of the pound). Grams: SI Brochure, 9th edition (BIPM 2019): 1 g = 0.001 kg (the kilogram is the SI base unit of mass).
References
- Ounces: NIST SP 811 (2008), Appendix B.8: 1 oz (avoirdupois) = 28.349523125 g exactly (1/16 of the pound)
- Grams: SI Brochure, 9th edition (BIPM 2019): 1 g = 0.001 kg (the kilogram is the SI base unit of mass)
- NIST Special Publication 811: Guide for the Use of the International System of Units (SI), 2008 edition.
- The International System of Units (SI Brochure), 9th edition, BIPM.