oz to grams converter
1 ounce is 28.3495 grams. To convert oz to grams, multiply the ounces by 28.3495.
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8 ounces =
226.796g
Formula: g = oz × 28.34952313
Show the steps
- Definition: 1 oz = 28.349523125 g exactly (1/16 lb); 1 g = 0.001 kg
- 8 oz × 28.34952313 = 226.796 g
Definitions used: 1 oz = 28.349523125 g exactly (1/16 lb); 1 g = 0.001 kg.
Source: NIST Handbook 44 (2026), Appendix C and NIST SP 811, Appendix B.8, checked on .
How to convert ounces to grams
Multiply the value in ounces by 28.34952313. The factor follows from the definitions: 1 oz = 28.349523125 g exactly (1/16 lb), and 1 g = 0.001 kg.
g = oz × 28.34952313
Worked example: 8 oz to g
- Definition: 1 oz = 28.349523125 g exactly (1/16 lb); 1 g = 0.001 kg
- 8 oz × 28.34952313 = 226.796 g
- Answer: 8 oz = 226.796 g.
Ounces to grams chart
| Ounces (oz) | Grams (g) |
|---|---|
| 0.25 | 7.08738 |
| 0.5 | 14.1748 |
| 1 | 28.3495 |
| 1.5 | 42.5243 |
| 2 | 56.699 |
| 3 | 85.0486 |
| 4 | 113.398 |
| 5 | 141.748 |
| 6 | 170.097 |
| Ounces (oz) | Grams (g) |
|---|---|
| 7 | 198.447 |
| 8 | 226.796 |
| 10 | 283.495 |
| 12 | 340.194 |
| 14 | 396.893 |
| 16 | 453.592 |
| 20 | 566.99 |
| 24 | 680.389 |
| 32 | 907.185 |
Values rounded to 6 significant digits. Type any other number in the converter at the top of the page.
Is an ounce 28 grams or 28.35 grams?
The exact value is 28.349523125 g, because an ounce is 1/16 of a pound of 453.59237 g. US nutrition labels round it: under 21 CFR 101.9, 1 oz of weight means 28 g on a label. For a recipe the difference is 1.2%.
What is the difference between ounces and fluid ounces?
An ounce (oz) measures weight; a fluid ounce (fl oz) measures volume, 29.57 mL in the US. They only match for water-like liquids: 8 fl oz of water weighs about 237 g, while 8 oz of weight is 226.8 g. For flour, sugar or butter use the cups to grams page.
More questions about ounces and grams
How many grams is 8 oz?
8 oz is 226.796 g, which is half a pound.
How many grams is 16 oz?
16 oz is one pound: 453.592 g.
Is this the troy ounce used for gold?
No. This page uses the avoirdupois ounce for food and parcels. Gold and silver are weighed in troy ounces, which are heavier.
How many grams is 4 oz?
4 oz is 113.398 g, a quarter of a pound.
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Sources and limits
- NIST Handbook 44 (2026), Appendix C
NIST Handbook 44-2026, Appendix C: General Tables of Units of Measurement.
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
- NIST SP 811, Appendix B.8
NIST Special Publication 811, Guide for the Use of the SI, Appendix B.8: Factors for Units Listed Alphabetically (page updated August 18, 2025).
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
- 21 CFR 101.9(b)(5)(viii)
Code of Federal Regulations, Title 21, § 101.9(b)(5)(viii): household measures for nutrition labeling (text in force when checked).
U.S. Food and Drug Administration. Text in force when checked on .
This is a calculation aid, not an official measurement service. Results are rounded to 6 significant digits for display. For trade, engineering, medical dosing or legal documents, confirm the figure in the official source. Nothing you type leaves your browser.