To convert ounces to grams, multiply by 28.3495. So 1 oz = 28.35 g, 8 oz = 226.8 g, and 16 oz (1 lb) = 453.6 g. This uses the avoirdupois ounce - the standard for food and everyday goods.
- Exact value: 1 oz = 28.349523125 g (derived from 1 lb = 453.59237 g, 16 oz/lb).
- 8 oz = 226.8 g. 16 oz = 453.6 g. 32 oz = 907.2 g.
- Quick mental estimate: multiply oz by 28 (result is 1.2% low).
- Do not confuse with fluid ounces (volume) or troy ounces (precious metals, 31.1035 g).
How to Use This Converter
Type any ounces value in the oz field and the grams result appears instantly. You can also type in the g field to convert back to oz. This converter uses avoirdupois ounces - not troy ounces or fluid ounces.
How Do You Convert Ounces to Grams?
Multiply ounces by 28.3495. The exact value is 28.349523125 g/oz, derived from the international pound: 1 lb = 453.59237 g exactly, and 1 lb = 16 oz, so 1 oz = 453.59237 ÷ 16 = 28.3495... g.
$$\text{g} = \text{oz} \times 28.3495$$
Worked examples: 1 oz = 28.35 g. 2 oz = 56.70 g. 4 oz = 113.4 g. 8 oz = 226.8 g. 12 oz = 340.2 g. 16 oz = 453.6 g.
How Do You Convert Grams to Ounces?
Divide grams by 28.3495. See the dedicated grams to ounces converter for a grams-first reference table.
$$\text{oz} = \text{g} \div 28.3495$$
Worked examples: 100 g = 3.527 oz. 250 g = 8.818 oz. 500 g = 17.637 oz.
Ounces to Grams Reference Table
Common cooking and food weight values converted using the exact factor 28.3495 g/oz:
| Ounces (oz) | Grams (g) | Common context |
|---|---|---|
| 0.5 oz | 14.17 g | Small spice amount |
| 1 oz | 28.35 g | Single serving (snack) |
| 2 oz | 56.70 g | - |
| 4 oz | 113.40 g | Quarter pound |
| 6 oz | 170.10 g | Standard chicken breast |
| 8 oz | 226.80 g | Half pound |
| 10 oz | 283.50 g | - |
| 12 oz | 340.19 g | Soda can (US) |
| 14 oz | 396.89 g | - |
| 16 oz | 453.59 g | 1 pound |
| 32 oz | 907.18 g | 2 pounds |
When Do You Need to Convert Ounces to Grams?
US recipes and food labels list weight in ounces; the rest of the world uses grams. This conversion is most common in food and cooking contexts:
- Cooking and baking - following a US recipe that lists ingredients in oz when you have a metric kitchen scale.
- Food labels - US products list serving size in oz; converting to grams helps compare with metric products.
- Postal and packaging - lightweight parcels shipped to metric countries need grams for customs.
- Nutrition and diet tracking - many US diet apps default to oz; international nutritional databases use grams.
Frequently Asked Questions
How many grams is 1 ounce?
1 avoirdupois ounce = 28.3495 g (exact: 28.349523125 g). Quick approximation: about 28 grams. Do not confuse with troy ounces (31.1035 g) used for gold and silver.
How many grams is 8 ounces?
8 oz = 226.8 g. This is half a pound. Many US recipes for meat portions use 8 oz as a standard serving size.
How many grams is 16 ounces?
16 oz = 453.6 g = exactly 1 pound (within floating-point rounding). This is because 1 lb = 453.59237 g exactly and 1 lb = 16 oz exactly.
Is a fluid ounce the same as a weight ounce?
No. A fluid ounce (fl oz) measures volume (~29.57 mL for US fl oz); a weight ounce (oz) measures mass (28.35 g). For water they are close but not equal. This converter handles weight ounces only.