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How do I convert grams to ounces?

Short answer

Divide the number of grams by 28.3495, since one ounce is about 28.3495 grams. So 100 grams is about 3.53 ounces and 500 grams is about 17.64 ounces. A free converter returns the exact figure for any weight instantly in your browser.

The conversion factor

One avoirdupois ounce is defined as exactly 28.349523125 grams, so ounces equal grams divided by 28.3495 to a practical precision. Because the definition is fixed, the conversion is exact up to the decimals you keep; a converter just applies the full factor so nothing drifts on larger weights.

Quick reference for the kitchen and the mailroom

Common values: 28 grams is about 0.99 ounces (roughly one ounce), 100 grams is about 3.53 ounces, 250 grams is about 8.82 ounces, and 500 grams is about 17.64 ounces. Recipes, postage weights and food portions bounce between grams and ounces, and a general weight converter also handles grams, ounces, pounds and kilograms in one place.

Step by step

  1. Enter the grams. Type the weight in grams into the converter.
  2. Divide by 28.3495. The tool divides by the exact factor to get ounces.
  3. Read the ounces. Read the precise ounce value instantly.

Frequently asked questions

How many ounces is 100 grams?

About 3.53 ounces, from 100 / 28.3495.

How many grams are in an ounce?

About 28.35 grams, since one ounce is defined as 28.349523125 grams.

Is this the same ounce used for food and mail?

Yes, this is the avoirdupois ounce used for everyday weight. It differs from the troy ounce used for precious metals.

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