Ounces to Grams Converter
Multiply a weight in ounces by 28.349523125 to get grams. 8 oz = 226.796185 g, so half a pound of butter is about 227 grams.
These are avoirdupois ounces (oz), the ones used for food, packages and everyday weights. Fluid ounces and troy ounces are different units and are not converted here.
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(opens in a new tab)How to convert ounces to grams
Formula: grams = ounces × 28.349523125
The constant is exact by definition: 1 ounce = 28.349523125 grams. It is not a rounded approximation.
Sixteen ounces make a pound, so 16 oz = 453.59237 g, which is exactly one pound. Because the ounce is defined as exactly 28.349523125 grams, a whole number of ounces always converts to a result that ends, so the table values are complete.
Worked example: 8 oz to grams
This result is complete, not rounded.
Convert 8 oz
Input
8 oz
Output
8 × 28.349523125 = 226.796185 g
Common ounces to grams conversions
| Ounces (oz) | Grams (g) |
|---|---|
| 1 oz | 28.349523125 g |
| 2 oz | 56.69904625 g |
| 4 oz | 113.3980925 g |
| 8 oz | 226.796185 g |
| 12 oz | 340.1942775 g |
| 16 oz | 453.59237 g |
| 32 oz | 907.18474 g |
When you need to convert ounces to grams
- US recipes that weigh ingredients in ounces, for a metric kitchen scale.
- Package weights printed in ounces, such as a 12 oz bag, compared with metric labels.
- Postage and shipping weights given in ounces, entered on a form that asks for grams.
- Portion sizes and product weights from US sources.
Things worth knowing
- Packaging often rounds the gram figure. A 16 oz package is usually labeled 454 g, while the exact conversion is 453.59237 g.
- If a recipe gives fluid ounces (fl oz) for a liquid, that is a volume. It cannot be converted to grams without knowing the density of the liquid.
Converting back and related converters
To go the other way, use the Grams to Ounces Converter, which applies ounces = grams / 28.349523125. For any other pair of units, open the Unit Converter, or browse every unit converter.
- LBS to KG Converter: for heavier weights given in pounds.
- KG to LBS Converter: to convert kilograms to pounds.
Frequently asked questions
How many grams are in one ounce?
Exactly 28.349523125 grams. That is the definition of the avoirdupois ounce, a sixteenth of a pound.
How many grams is 4 oz?
4 oz = 113.3980925 g. A quarter of a pound.
Can I use this for fluid ounces?
No. A fluid ounce is a volume, and its weight depends on the liquid. This converter uses ounces of weight only.
What is a quick way to convert ounces to grams?
Multiply by 28, or by 30 for a rougher figure. For 12 oz, 12 × 28 gives 336 g against an exact 340.1942775 g.