Ounces to Grams Converter
Enter a value to instantly convert between weight units.
1 Ounce = 28.3495 Gram
Key Formulas
Kilogram → Pound
lb = kg × 2.20462Pound → Kilogram
kg = lb × 0.453592Gram → Ounce
oz = g × 0.035274Ounce → Gram
g = oz × 28.3495Formula
g = oz × (0.028349523125 / 0.001)One ounce is 28.349523125 grams, about 28.35 g, so multiply ounces by 28.3495. The value follows from 16 ounces per pound in NIST Handbook 44 and a 453.59237 g pound from NIST footnote 22, with grams at 0.001 kg under the BIPM SI prefixes. Bakers, mail-order sellers, and travelers converting US product weights to metric rely on it. A 12 oz bag is about 340.19 g. A printed gram figure may be rounded, so it can differ from the full result.
Source: NIST exact and named mass definitions (definition-derived arithmetic)
Reviewed by the Convert Calc editorial team · Last reviewed: · see our methodology
Frequently Asked Questions
Real-World Examples
A 1 oz serving on a US food label.
1 oz = 28.34952313 g
Example: a 4 oz block of butter.
4 oz = 113.3980925 g
A 16 oz (1 lb) package, in grams.
16 oz = 453.59237 g
An 8 oz portion of cheese.
8 oz = 226.796185 g