Convert ounces to grams

Formula: g = oz × 28.3495

oz to g quick reference table

Everyday oz values, converted

• 1 oz = 28.3495 g — a single recipe ounce.
• 8 oz = 226.796 g — a US cup of water by weight.
• 16 oz = 453.592 g — one pound.

Where oz to g comes up

Weight conversions show up at the gym, at the airline check-in desk, in recipes written for another country and at the doctor's office. Scales in one country are almost never labelled in the other country's unit, which is why the same figure has to be converted repeatedly.

Doing oz to g in your head

Multiply by 28.3 for a close estimate; the calculator above keeps the full factor of 28.3495.

Precision and rounding

One ounce is exactly 28.3495 grams under the current definitions of both units, so the only judgement call is how many digits you keep. Two decimal places is already finer than most household scales and tape measures can read, while engineering and medical work usually keeps the full factor and rounds once at the end rather than at every step.