How many grams are in an ounce of gold?

An ounce of gold is usually a troy ounce, which is 31.1035 grams — heavier than the standard 28.35 g ounce used for food.

Is an ounce exactly 28 grams?

Almost. One ounce is 28.3495 grams. People round to 28 g for cooking, but use the exact figure for precise work.

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How Many Grams Are in an Ounce? (Quick Conversion Guide)

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The quick answer: 1 ounce = 28.3495 grams. For everyday use, 28.35 g (or just "about 28 g") is close enough. Here's the detail, plus the conversions people look up most.

Exact vs. everyday

Exact: 1 oz = 28.3495231 g
Cooking: round to 28 g
The reverse: 1 g = 0.035274 oz

Common ounce conversions

2 oz = 56.70 g
4 oz = 113.40 g (a quarter-pound)
8 oz = 226.80 g (half a pound)
16 oz = 453.59 g (one pound)

Watch out: weight vs. fluid ounces

A fluid ounce measures volume, not weight, so it doesn't convert to grams directly — it depends on the liquid's density. The 28.35 g rule applies only to ounces of mass (like food on a scale).

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