Ounces to Grams Converter

About the oz to g calculation

One ounce is exactly 28.3495 grams, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Common in US recipes and for postal weights. Not the same as a fluid ounce. The everyday cooking and food-labelling unit in metric countries.

Formula

g = oz × 28.3495

1 oz = 28.3495 g
1 g = 0.035274 oz

Worked example

To convert 16 oz, multiply by 28.3495: 16 × 28.3495 = 453.592 g.

Frequently asked questions

How many grams are in a ounce?

There are 28.3495 grams in one ounce. To convert any amount, multiply the number of ounces by 28.3495.

How do I convert grams back to ounces?

Divide instead of multiplying, or equivalently multiply by 0.035274. One gram is 0.035274 ounces.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between ounces and grams is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Where is each of these units used?

Ounces: common in US recipes and for postal weights. Not the same as a fluid ounce. Grams: the everyday cooking and food-labelling unit in metric countries.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units