Quick Answer: Ounces to Grams
One ounce is approximately 28.35 grams (1 oz ≈ 28.35 g).
Conversely, 1 g ≈ 0.03527 oz.
Formula: g = oz × 28.349523125
Worked examples
- 1 oz ≈ 28.35 g
- 2 oz ≈ 56.7 g
- 4 oz ≈ 113.4 g
Method and limitations
Multiply ounces by 28.349523125. This is the avoirdupois ounce, a unit of mass equal to 1/16 of the international pound, so the factor is exact. Calculations use full-precision constants; answers in this box are rounded for readability (≈ marks a rounded value) and the calculator shows up to 9 significant figures. oz here is the avoirdupois ounce, a unit of mass: exactly 28.349523125 g, or 1/16 lb. It is not the troy ounce used for precious metals (31.1034768 g), and not the fluid ounce, which measures volume.
Each factor is exact by definition, derived from exact definitions, or a documented conventional value — see the methodology and sources.
Conversion Formula
Multiply ounces by 28.349523125. This is the avoirdupois ounce, a unit of mass equal to 1/16 of the international pound, so the factor is exact.
Complete Guide to Ounces to Grams Conversion
What is an ounce?
The avoirdupois ounce (oz) is a unit of mass: 1/16 lb, exactly 28.349523125 g.
What is a gram?
The gram (g) is 1/1,000 of a kilogram.
How the Conversion Works
g = oz × 28.349523125. Kitchen scales usually read to 1 g, so round to whole grams for cooking.
Step-by-Step Conversion Guide
Follow these steps to convert ounces to grams manually:
Start with your value in ounces
Example: You want to convert 4 oz
Apply the conversion formula
Use the formula: g = oz × 28.349523125
Calculate the result
4 oz = 113.3981 g
Verify your answer
Use our calculator above to double-check your manual calculation.
Quick Mental Math Tip
Multiply by 30 and take off about 5%: 4 oz → 120 − 6 = 114 g (exact 113.4 g).
Common Conversions
| Ounces (oz) | Grams (g) | Grams → Ounces |
|---|---|---|
| 1 oz | 28.3495 | 1 g = 0.035274 oz |
| 2 oz | 56.699 | 2 g = 0.0705479 oz |
| 4 oz | 113.398 | 4 g = 0.141096 oz |
| 6 oz | 170.097 | 6 g = 0.211644 oz |
| 8 oz | 226.796 | 8 g = 0.282192 oz |
| 10 oz | 283.495 | 10 g = 0.35274 oz |
| 12 oz | 340.194 | 12 g = 0.423288 oz |
| 16 oz | 453.592 | 16 g = 0.564383 oz |
| 24 oz | 680.389 | 24 g = 0.846575 oz |
| 32 oz | 907.185 | 32 g = 1.12877 oz |
Popular Ounces to Grams Conversions
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When You'll Need This Conversion
Recipes in ounces
Weigh ingredients given in ounces on a gram kitchen scale.
Package weights
Compare net weights labelled in oz with gram-labelled products.
Common Mistakes to Avoid
Treating fluid ounces as weight
"oz" on a solid ingredient is mass; "fl oz" is volume.
Use this page only for weight ounces.
Frequently Asked Questions
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Conversion factors on this page are either exact by definition, derived from exact definitions, or conventional values in documented use. Each is listed with its source in our conversion methodology and sources, which cites the BIPM SI Brochure, NIST Special Publication 811 and the relevant IEC or national standards. Results are rounded for display only; calculations use full precision.