How to convert ounces to grams
One ounce equals 28.3495 grams, so multiply the number of ounces by 28.3495:
g = oz × 28.3495
oz = g ÷ 28.3495 (1 g = 0.035274 oz)
Example: 4 oz → 4 × 28.3495 = 113.398 g.
Going the other way, divide by 28.3495, or multiply by 0.035274; the grams to ounces converter does it for you.
Everyday values
| Ounces | Grams | For example |
|---|---|---|
| 1 oz | 28.3495 g | one ounce |
| 4 oz | 113.398 g | a quarter pound |
| 8 oz | 226.796 g | half a pound |
| 12 oz | 340.194 g | three quarters of a pound |
| 16 oz | 453.592 g | one pound |
When you need this conversion
Note that the weight ounce (oz) is different from the fluid ounce (fl oz), which measures volume. 8 fl oz of water weighs about 8.3 oz, but 8 fl oz of flour weighs much less. This converter uses the weight ounce.
Ounce to gram conversion table
| oz | g | oz | g |
|---|---|---|---|
| 1 oz | 28.3495 g | 17 oz | 481.942 g |
| 2 oz | 56.699 g | 18 oz | 510.291 g |
| 3 oz | 85.0486 g | 19 oz | 538.641 g |
| 4 oz | 113.398 g | 20 oz | 566.99 g |
| 5 oz | 141.748 g | 21 oz | 595.34 g |
| 6 oz | 170.097 g | 22 oz | 623.69 g |
| 7 oz | 198.447 g | 23 oz | 652.039 g |
| 8 oz | 226.796 g | 24 oz | 680.389 g |
| 9 oz | 255.146 g | 25 oz | 708.738 g |
| 10 oz | 283.495 g | 26 oz | 737.088 g |
| 11 oz | 311.845 g | 27 oz | 765.437 g |
| 12 oz | 340.194 g | 28 oz | 793.787 g |
| 13 oz | 368.544 g | 29 oz | 822.136 g |
| 14 oz | 396.893 g | 30 oz | 850.486 g |
| 15 oz | 425.243 g | 31 oz | 878.835 g |
| 16 oz | 453.592 g | 32 oz | 907.185 g |
About the units
- Ounce (oz): 1/16 of a pound, exactly 28.349523125 grams.
- Gram (g): one thousandth of a kilogram.
Both are units of weight (mass). The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many grams are in one ounce?
One ounce is 28.3495 grams. One gram is 0.035274 ounces.
How do I convert ounces to grams?
Multiply the value in ounces by 28.3495. To go back, divide by 28.3495.
What is 4 oz in grams?
4 oz = 113.398 g.
What is 8 oz in grams?
8 oz = 226.796 g.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.