Ounces (oz) to Grams (g) Conversion
Ounces
The ounce (avoirdupois) is a unit of mass equal to exactly 28.349523125 grams, or one sixteenth of a pound, used in the United States and United Kingdom for food portions, postal weights, and product labelling. It must be distinguished from the troy ounce (31.1035 g), used exclusively for precious metals, and from the fluid ounce, which is a unit of volume.
Grams
The gram is a unit of mass equal to one thousandth of a kilogram (10⁻³ kg) and is the standard unit for small masses in chemistry, pharmacy, food science, and nutrition. In the CGS system, the gram was the fundamental unit of mass. In nutrition, all macronutrients — carbohydrates, proteins, and fats — are quantified in grams per serving.
| Ounces (oz) | Grams (g) |
|---|---|
| 0.1 oz | 2.835 g |
| 1 oz | 28.3495 g |
| 2 oz | 56.699 g |
| 3 oz | 85.0486 g |
| 5 oz | 141.7476 g |
| 10 oz | 283.4952 g |
| 20 oz | 566.9905 g |
| 30 oz | 850.4857 g |
| 50 oz | 1,417.4762 g |
| 100 oz | 2,834.9523 g |
| 1000 oz | 28,349.5231 g |
Frequently Asked Questions (FAQ)
How many grams are in 1 ounces?
1 ounces (oz) is exactly 28.350 grams (g).
How do I convert ounces to grams?
Multiply the value in ounces by 28.350 to get the result in grams. Or use the converter above — type any number and see the result instantly.
How do I convert ounces to grams?
Multiply ounces by 28.3495 to get grams. The exact value is 1 oz = 28.349523125 g. Key cooking amounts: ¼ oz = 7.09 g, ½ oz = 14.17 g, 1 oz = 28.35 g, 2 oz = 56.70 g, 4 oz = 113.40 g, 8 oz = 226.80 g, 16 oz (1 lb) = 453.59 g. A useful shortcut: multiply ounces by 28 for a quick approximation — accurate within 0.2% for any amount.
Why do gold and silver use troy ounces instead of regular ounces?
A troy ounce used for gold, silver, and platinum weighs 31.1035 g — about 10% heavier than the common avoirdupois ounce (28.35 g). The troy system originated in Troyes, France, a major medieval trading hub, and was adopted by the English Crown for coinage in the 15th century to standardise precious metal transactions. Today, all spot gold prices (e.g. "gold at $X per oz") refer to troy ounces, not regular ounces. This matters practically: a "1 oz gold coin" weighs 31.1 g, not 28.35 g.