How to convert oz to grams?
Type a value in either box, and the answer shows it in the other unit as you type.
- Grams (g)
- 28.349523
1 oz = 28.349523 g.
Grams (g): 28.349523. 1 oz = 28.349523 g.
Grams (g) by ounces (oz)
How to calculate
Converts ounces (oz) to grams (g) and back, with the exact unit definitions.
Example with the default inputs (Ounces (oz) 1): 1 oz = 28.349523 g.
Formula: g = oz × 28.349523125
- 1 ounce = 28.349523125 grams, from the exact definitions in NIST SP 811.
- Ounces here are avoirdupois ounces, a weight: 1 oz = 1/16 lb = 28.349523125 g. A US fluid ounce is a volume.
- Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up; an answer of 1 billion or more shows at most 15 significant digits.
Worked examples
Each example is checked against the calculator on every build.
- Ounces (oz) 1 gives Grams (g) 28.349523.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Ounces (oz) 16 gives Grams (g) 453.59237.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Grams (g) 453.59237 gives Ounces (oz) 16.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
Other questions people ask
How many grams are in an ounce?
1 ounce is 28.349523 grams, from the exact unit definitions (NIST SP 811).
How do I convert oz to grams?
Multiply by 28.349523: g = oz × 28.349523125. For example, 1 oz × 28.349523 = 28.349523 g.
How do I convert grams back to oz?
Multiply by 0.035274, or type the grams into the second box and the converter works it out. 1 gram is 0.035274 ounces.
Is an ounce here a weight or a volume?
A weight: the avoirdupois ounce, 1/16 of a pound (28.349523125 g exactly). A US fluid ounce (29.57 mL) measures volume, as on cups-to-ounces pages.
What is 16 oz in grams?
453.59237 g, exactly 1 pound: 16 × 28.349523125.
What is 4 oz in grams?
113.398093 g: 4 × 28.349523125. A quick estimate of 28 g an ounce is 1.2% low.