The exact factor
One ounce is 28.3495 g. For everyday cooking, dividing grams by 28 is close enough (a 250 g block of butter is 8.8 oz); for baking, use the exact figure.
Why recipes disagree
- US recipes often round 28.35 to 28
- Metric recipes round 100 g to 3.5 oz
- Over 500 g, rounding differences reach several grams
- Weighing in grams is more precise than ounces — use the scale you have
Common anchors
100 g = 3.53 oz. 250 g = 8.82 oz. 500 g = 17.6 oz. A stick of butter is 113 g = 4 oz.
When it matters
Chocolate, cheese and portions. A 5 g error is invisible; a 30 g error is a different sized portion entirely.
Frequently Asked Questions
How many grams in an ounce?
28.3495 g exactly. For cooking, 28 g is close enough; for baking, use the exact figure.
Is an ounce the same as a fluid ounce?
No — an ounce is weight (28.35 g), a fluid ounce is volume (29.57 mL).
Should I round grams to ounces?
Only in cooking. In baking, convert in the background and keep the gram figure as the source of truth.
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