Ounces to Grams
One ounce equals 28.35 grams. Always.
Ounces to grams is a pure weight conversion, so unlike cups-to-grams, it does not depend on what you are measuring. One ounce always equals 28.35 grams. Half an ounce is 14.17 grams. A pound (16 ounces) is 453.6 grams.
This converter handles ounces to grams and back for any weight, including fractional amounts common in recipes like 4.5 oz. American recipes often use ounces for meats, fish, chocolate, and dried ingredients, while European and professional baking recipes typically use grams. When you are cooking across that divide, this conversion becomes essential.
There is one important distinction: fluid ounces (volume) are different from weight ounces. One US fluid ounce is 29.57 mL of liquid, but the weight depends on density. If your recipe says oz without specifying, assume weight for solids (flour, chocolate, meat) and volume for liquids.
Result
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Quick Reference
Common ounce and gram weights.
| Weight | Equivalent |
|---|---|
| 1 oz | 28.35 g |
| 2 oz | 56.70 g |
| 4 oz | 113.40 g |
| 8 oz | 226.80 g |
| 16 oz (1 lb) | 453.59 g |
| 32 oz (2 lb) | 907.19 g |
| 100 g | 3.53 oz |
| 500 g | 17.64 oz |
| 1000 g (1 kg) | 35.27 oz |
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The Reference
1 avoirdupois ounce = 28.3495 grams. 16 ounces = 1 pound = 453.59 g. Fluid ounces are a different measurement (volume, not weight): 1 US fl oz = 29.57 mL.
For water and water-based liquids, 1 fl oz is approximately 1 weight oz. For denser liquids like honey or syrup, they differ significantly. Recipes in UK use the same avoirdupois ounce as the US.
Why US Recipes Still Use Ounces
The United States is one of three countries (along with Liberia and Myanmar) that never fully adopted the metric system for everyday use. In cooking, this means American recipes typically specify weights in ounces and pounds rather than grams. For American cooks, this is natural. For everyone else, it means constant conversion.
1 avoirdupois ounce equals 28.35 grams. 16 ounces equal 1 pound (453.6 g). These are weight units, not volume. Fluid ounces (volume) are different: 1 US fluid ounce is 29.57 mL, used for liquids. Modern recipes usually specify "oz" for dry weight and "fl oz" for liquid volume to avoid confusion.
When converting American meat, fish, or chocolate recipes to European kitchens, the ounces-to-grams conversion is pure arithmetic. For volume-based ingredient conversions (cups of flour), use our cups-to-grams converter instead. Our universal converter handles combinations of weight and volume in a single interface.
How to Use
- Choose the direction (oz to g or g to oz).
- Enter the amount. Fractional values like 4.5 are supported.
- Get the result plus kg or pound equivalent.
Frequently Asked Questions
Are US ounces and UK ounces the same?
For weight, yes. Both use the avoirdupois ounce (28.35 g). For fluid ounces, no: US fl oz = 29.57 mL, while UK fl oz = 28.41 mL (a 4% difference). Most recipes specify which.
How do I know if a recipe means weight or fluid ounces?
Look at context. Solids (flour, chocolate, meat) are weight ounces. Liquids (milk, water, oil, broth) are fluid ounces. 4 oz butter is weight; 4 oz milk is fluid volume. Modern recipes often abbreviate fl oz for liquid ounces to disambiguate.
Why do some recipes use ounces instead of grams?
American cultural convention. The US never fully adopted metric measurements. Most European and professional recipes use grams because they are more precise, with no fraction-of-an-ounce ambiguity.
What is 8 oz of flour in grams?
8 avoirdupois ounces = 226.8 grams of flour. This is a weight conversion. It does not depend on type of flour. However, if a recipe says 1 cup of flour (volume), that is about 125 g, which is 4.4 oz. Different from 8 oz flour in the same recipe.
Can I use a postal scale to measure kitchen ingredients?
Technically yes if it measures to 1 gram precision. But a dedicated kitchen scale is usually more precise (0.1 g) and has a tare function that zeroes out container weight. Useful for measuring into a bowl.
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