Troy Ounces to Grams Converter (oz t to g)
1 oz t = 31.1034768 g exactly. Convert troy ounces to grams for gold, silver and platinum coins and bars, with oz t to g and g to oz t charts.
Gram (g) = Troy Ounce (oz t) × 31.1034768
Troy Ounce (oz t): The troy ounce is 480 grains, exactly 31.1034768 grams, about 10% heavier than an ordinary ounce. Gold, silver and platinum prices are quoted per troy ounce.
Gram (g): The gram is one thousandth of a kilogram, the SI base unit of mass. It is used worldwide for food, postage and small quantities of almost anything.
| Troy Ounce (oz t) | Gram (g) |
|---|---|
| 1 | 31.1034768 |
| 5 | 155.517384 |
| 10 | 311.034768 |
| 25 | 777.58692 |
| 50 | 1555.17384 |
| 100 | 3110.34768 |
Gold, silver, platinum and palladium are priced and traded by the troy ounce, a unit of 480 grains that is exactly 31.1034768 g. It is about 10% heavier than the ordinary ounce of 28.35 g used for food, so a precious-metal price per ounce always refers to the troy ounce.
Many bars and pieces of jewelry, however, are sold in grams, so the conversion is needed to compare a bar's weight with a price per troy ounce. Most bullion coins state their fine metal content in troy ounces, and the charts cover sizes from a twentieth of an ounce up to 1,000 oz t.
How to use this tool
- Type a value in the Troy Ounce box to see it in grams, or type in the Gram box to convert the other way.
- Press ⇄ to swap the two units, or Load example for a typical value.
- Check the charts below for common values; for other units, open the Weight & Mass converter.
Formula
Gram (g) = Troy Ounce (oz t) × 31.1034768
Troy Ounce (oz t) = Gram (g) × 0.0321507465686
Both factors come from exact definitions: 1 gram = 0.0321507465686 troy ounces and 1 troy ounce = 31.1034768 grams (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
1 oz t × 31.1034768 ≈ 31.1035 g
100 g × 0.0321507465686 ≈ 3.21507 oz t
Troy Ounce to Gram chart
Common values from troy ounces to grams, rounded to four decimal places.
| Troy Ounce (oz t) | Gram (g) |
|---|---|
| 0.05 | 1.5552 |
| 0.1 | 3.1103 |
| 0.25 | 7.7759 |
| 0.5 | 15.5517 |
| 1 | 31.1035 |
| 2 | 62.207 |
| 3 | 93.3104 |
| 5 | 155.5174 |
| 10 | 311.0348 |
| 15 | 466.5522 |
| 20 | 622.0695 |
| 25 | 777.5869 |
| 32.15 | 999.9768 |
| 50 | 1,555.17 |
| 100 | 3,110.35 |
| 250 | 7,775.87 |
| 400 | 12,441.39 |
| 500 | 15,551.74 |
| 1,000 | 31,103.48 |
Gram to Troy Ounce chart
The reverse direction for values people often look up.
| Gram (g) | Troy Ounce (oz t) |
|---|---|
| 1 | 0.0322 |
| 2.5 | 0.0804 |
| 5 | 0.1608 |
| 10 | 0.3215 |
| 20 | 0.643 |
| 31.1 | 0.9999 |
| 50 | 1.6075 |
| 100 | 3.2151 |
| 250 | 8.0377 |
| 400 | 12.8603 |
| 1,000 | 32.1507 |
| 12,500 | 401.8843 |
Coin and bar sizes in troy ounces
| Item | Troy Ounce (oz t) | Gram (g) |
|---|---|---|
| Tenth-ounce gold coin | 0.1 | 3.1103 |
| Quarter-ounce gold coin | 0.25 | 7.7759 |
| Half-ounce gold coin | 0.5 | 15.5517 |
| One-ounce bullion coin | 1 | 31.1035 |
| Kilogram bar | 32.1507 | 1,000 |
| London Good Delivery gold bar, approximately | 400 | 12,441.39 |
| London Good Delivery silver bar, approximately | 1,000 | 31,103.48 |
Quick mental estimate
Multiply by 31 for a quick figure: 10 oz t → 310 g, about 0.3% low. Add a tenth of a gram for each ounce to get closer: 10 oz t → 311 g, within about 0.01% of the exact 311.03 g.
Use the converter or the charts when the exact figure matters.
The two units
Troy Ounce (oz t): The troy ounce is 480 grains, exactly 31.1034768 grams, about 10% heavier than an ordinary ounce. Gold, silver and platinum prices are quoted per troy ounce.
Gram (g): The gram is one thousandth of a kilogram, the SI base unit of mass. It is used worldwide for food, postage and small quantities of almost anything.
Frequently asked questions
Is a troy ounce heavier than a regular ounce?
Yes. A troy ounce is 31.1034768 g and an avoirdupois ounce 28.349523125 g, so the troy ounce is about 9.7% heavier.
Why is a troy pound lighter than a regular pound?
The troy pound has only 12 troy ounces, 373.2417216 g in all, while the everyday pound has 16 lighter ounces and weighs 453.59237 g. The troy pound is no longer used for trading, but the troy ounce is.
What does "fine ounce" mean on a coin or bar?
It is the weight of pure metal, in troy ounces, leaving out any alloy. A 22-karat gold coin sold as 1 oz contains one troy ounce of gold but weighs more in total, because the alloy also contains other metals such as copper. The coin's gross weight is a separate figure from its fine content.
How precise is the result?
The converter uses the exact definitions above with browser floating-point arithmetic and shows up to 12 significant digits. The charts round to four decimal places for reading.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/troy-ounce-to-gram-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Troy Ounces to Grams Converter (oz t to g). https://kakao.mobile/tools/troy-ounce-to-gram-converter/
“Troy Ounces to Grams Converter (oz t to g).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/troy-ounce-to-gram-converter/.
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