Grams to Ounces Converter (g to oz)

The ounce used for food and parcels in the US and UK is the avoirdupois ounce, 1/16 of a pound: exactly 28.349523125 grams. Kitchen scales, nutrition labels and postage rates all use it.

This page converts weight only. Fluid ounces measure volume, and precious metals are priced in the heavier troy ounce, so check which ounce a recipe or price means.

How to use this tool

1. Type a value in the Gram box to see it in ounces, or type in the Ounce box to convert the other way.
2. Press ⇄ to swap the two units, or Load example for a typical value.
3. Check the charts below for common values; for other units, open the Weight & Mass converter.

Formula

oz = g ÷ 28.349523125

g = oz × 28.349523125

Both factors come from exact definitions: 1 ounce = 28.349523125 grams and 1 gram = 0.0352739619496 ounces (shown to 12 significant digits).

Example

Two conversions worked with the same factors the converter uses:

250 g × 0.0352739619496 ≈ 8.81849 oz

4 oz × 28.349523125 ≈ 113.398 g

Gram to Ounce chart

Common values from grams to ounces, rounded to four decimal places.

Ounce to Gram chart

The reverse direction for values people often look up.

Quick mental estimate

Divide grams by 28 for a quick figure: 250 g ÷ 28 ≈ 8.9 oz. Using 28 instead of 28.35 overstates the ounces by about 1.2%.

Use the converter or the charts when the exact figure matters.

The two units

Gram (g): The gram is one thousandth of a kilogram, the SI base unit of mass. It is used worldwide for food, postage and small quantities of almost anything.

Ounce (oz): The avoirdupois ounce is 1/16 of a pound, exactly 28.349523125 grams. It is the everyday ounce for food and parcels in the US; precious metals use the heavier troy ounce.