Ounces to grams formula & kitchen mental math
The international standard defines 1 avoirdupois ounce as exactly 28.349523125 grams. For everyday kitchen measurements, rounding to 28.35 g provides perfect precision.
Grams = Ounces × 28.349523125 Example: 8 oz × 28.3495 = 226.8 g Fast kitchen rounding shortcut
When cooking or baking casually without a scientific calculator, use the 28x rule (or multiply by 30 for quick estimates):
- Standard precision: Multiply ounces by 28.35.
- Rough estimate: Multiply ounces by 30, then subtract 5% of the total.
Baking ingredient weight reference chart
In baking, measuring by weight (grams or weight ounces) is far more accurate than measuring by volume (fluid ounces or cups). Here is how standard recipe portion sizes convert:
| Ounces (oz) | Grams (g) | Common Recipe Equivalent |
|---|---|---|
| 0.25 oz | 7.09 g | Standard packet of active dry yeast (1/4 oz / 7g) |
| 0.50 oz | 14.17 g | 1 tablespoon of butter or sugar |
| 1.00 oz | 28.35 g | 1 standard baking chocolate square / 1/8 cup butter |
| 2.00 oz | 56.70 g | 1 large egg (in shell) / 1/4 cup butter |
| 4.00 oz | 113.40 g | 1 stick of butter (1/2 cup) / 1/4 lb ground meat |
| 8.00 oz | 226.80 g | 2 sticks of butter (1 cup) / 1/2 lb weight portion |
| 16.00 oz | 453.59 g | 1 full pound (1 lb) baseline |
Nutrition label & serving size conversions
FDA nutritional labels in the United States display serving sizes in both weight ounces and grams. Common packaged food serving sizes include:
| Food Item | Ounces (oz) | Grams (g) |
|---|---|---|
| Snack Foods / Nuts | 1.00 oz | 28.35 g (Standard 28g serving) |
| Protein Powder Scoop | 1.16 oz | 33.00 g |
| Cereal Serving | 1.50 oz | 42.52 g |
| Chicken Breast Portion | 4.00 oz | 113.40 g (Standard 4 oz raw protein serving) |
| Steak Portion | 8.00 oz | 226.80 g (8 oz cut) |
Converting larger weights for shipping or body weight? Use our LBS to Ounces Converter or Pounds to Kilograms Converter.
Frequently asked questions
How many grams are in 1 ounce?
There are exactly 28.349523125 grams in 1 ounce. For baking, recipes usually round this to 28.35 g.
How many grams is a 4 oz stick of butter?
A standard 4 oz stick of butter (1/2 cup) is equal to 113.4 grams.
Is 1 fluid ounce equal to 1 weight ounce in grams?
Only for pure water. One fluid ounce of water weighs approximately 29.57 grams. However, dry ingredients (like flour, sugar, or cocoa) vary in density, so dry ounces must always be weighed using a mass scale (1 oz = 28.35 g).
How do I convert 8 oz to grams for baking?
8 ounces multiplied by 28.3495 equals 226.8 grams.