Ounces to Grams
Convert avoirdupois ounces to grams. One ounce is 1/16 of the international pound, so 1 oz = 28.349523125 g. Troy ounces for precious metal are not on this list.
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How to convert ounces to grams
- Enter the mass in avoirdupois ounces. The default is 1.
- Keep From as Ounces and To as Grams, or pick pounds or kilograms.
- Read grams. Multiply ounces by 28.349523125.
- Swap units to convert grams back to ounces. Kitchen fluid ounces are volume, not this page.
Avoirdupois ounce
Mass (SI kilogram)
| Avoirdupois ounce | 1 oz = 1/16 lb = 28.349523125 g |
|---|---|
| Pound | 1 lb = 0.45359237 kg exactly |
| Gram | 1 g = 0.001 kg |
| Stone | 1 st = 14 lb = 224 oz |
| Troy ounce | Not listed. About 31.1035 g, a different unit |
| Fluid ounce | Volume on the volume and cooking converters |
What ounces to grams does
This spoke locks the mass engine on avoirdupois ounces to grams. The pound is 0.45359237 kg by definition. One ounce is one sixteenth of that pound, so 0.45359237 / 16 = 0.028349523125 kg = 28.349523125 g. Package labels in the United States often print both oz and g using this pair.
Pounds from ounces sit on ounces to pounds. The hub is mass. Fluid ounces are on volume and cooking.
Ounce to gram factor
g = oz × 28.349523125. oz = g / 28.349523125. lb = oz / 16. kg = oz × 0.028349523125. Swap exchanges From and To. Do not use 28 g as a legal factor when you need the exact ounce.
Avoirdupois, troy, and fluid ounces
Food and postal scales use avoirdupois. Gold and silver use troy ounces, which this page does not convert. A US fluid ounce is 29.5735295625 ml of volume, not 28.35 g of mass. Water is close to 1 g/ml, so a fluid ounce of water is near 29.57 g, not 28.35 g. That coincidence is not a conversion on this form.
When to convert ounces to grams here
Read a 8 oz pack as grams, compare a postal ounce with a metric label, or swap to pounds. Leave recipes in cups on cooking. Leave bullion on a troy table you trust elsewhere.
What this page does not do
It does not convert troy ounces. It does not convert fluid ounces. It does not weigh an object. Input stays in this tab.