Bullion weight tables
Short answer: A 1 oz bar or coin contains 31.1035 grams of metal, a 100 g bar is 3.2151 troy ounces, and a 1 kg bar is 32.1507 troy ounces. The standard 400 troy ounce gold bar weighs about 12.44 kg.
Metric sizes
| Size | Grams | Troy oz |
|---|---|---|
| 1 g | 1 | 0.0322 |
| 2.5 g | 2.5 | 0.0804 |
| 5 g | 5 | 0.1608 |
| 10 g | 10 | 0.3215 |
| 20 g | 20 | 0.6430 |
| 50 g | 50 | 1.6075 |
| 100 g | 100 | 3.2151 |
| 250 g | 250 | 8.0377 |
| 500 g | 500 | 16.0754 |
| 1 kg | 1,000 | 32.1507 |
Troy ounce sizes
| Size | Grams | Troy oz |
|---|---|---|
| 1/10 oz | 3.110 | 0.10 |
| 1/4 oz | 7.776 | 0.25 |
| 1/2 oz | 15.552 | 0.50 |
| 1 oz | 31.10 | 1 |
| 2 oz | 62.21 | 2 |
| 5 oz | 155.52 | 5 |
| 10 oz | 311.03 | 10 |
| 100 oz | 3,110.35 | 100 |
| 400 oz (good delivery) | 12,441.39 | 400 |
How to use it
- Find your piece's stated size in the left column.
- Read the fine metal weight in grams and troy ounces beside it.
- Multiply by the spot price per troy ounce to estimate melt value, or use the melt value calculator.
Formula: 1 troy ounce = 31.1034768 g, so 1 g = 0.0321507 troy oz
Questions
Does a 1 oz coin weigh exactly 31.1035 grams?+
Its fine metal content is one troy ounce, 31.1035 g. Some coins, such as 22 karat gold coins, weigh more in total because the alloy adds copper or silver to the gold.
What is a good delivery bar?+
A good delivery bar is the large bar traded between banks and refiners. A gold good delivery bar weighs roughly 400 troy ounces, about 12.4 kg.
Why are bars sold in both grams and ounces?+
Metric sizes dominate in Europe, Asia and the Middle East, while ounce sizes are common in North America. Spot prices are quoted per troy ounce either way.
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