How Many Grams Are in a Troy Ounce?
A troy ounce is 31.1035 grams. As of November 13, 2026, gold at $3,877.17 per troy ounce works out to $124.65 per gram, and silver at $48.96 per ounce to $1.57 per gram.
One troy ounce of gold or silver is 31.1035 grams. Conversion tables between troy ounces, grams, pennyweights and kilograms, with each weight valued at today's gold and silver prices.
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How Many Grams Are in an Ounce of Gold?
An ounce of gold is a troy ounce, which is 31.1035 grams (31.1034768 to be exact). That is the ounce every gold, silver, platinum and palladium price is quoted in, including the spot price at the top of this page.
It is heavier than the ounce most people know. The everyday (avoirdupois) ounce used for food and postage is 28.3495 grams, so a troy ounce is about 9.7 percent heavier. Weighing gold on a kitchen scale and treating the reading as troy ounces overstates the weight by that much.
At the current gold price of $3,877.17 per troy ounce, one gram of pure gold is worth $124.65: the ounce price divided by 31.1035.
Troy Ounces to Grams
Multiply troy ounces by 31.1035 to get grams. The value columns use the current spot price of $3,877.17 per ounce for gold and $48.96 for silver, for pure metal.
| Troy ounces | Grams | Gold value | Silver value |
|---|---|---|---|
| 1/10 troy oz | 3.11 g | $387.72 | $4.90 |
| 1/4 troy oz | 7.776 g | $969.29 | $12.24 |
| 1/2 troy oz | 15.552 g | $1,939 | $24.48 |
| 1 troy oz | 31.104 g | $3,877 | $48.96 |
| 5 troy oz | 155.518 g | $19,386 | $244.82 |
| 10 troy oz | 311.035 g | $38,772 | $489.64 |
| 100 troy oz | 3,110.35 g | $387,717 | $4,896 |
The per-unit pages carry the same figures with charts: gold per ounce, gold per gram, silver per ounce and silver per gram.
Grams to Troy Ounces
Divide grams by 31.1035 to get troy ounces, or multiply by 0.03215. A kilogram is 32.1507 troy ounces, which is why a kilo bar is worth a little more than 32 times the ounce price.
| Grams | Troy ounces | Gold value | Silver value |
|---|---|---|---|
| 1 g | 0.0322 troy oz | $124.65 | $1.57 |
| 5 g | 0.1608 troy oz | $623.27 | $7.87 |
| 10 g | 0.3215 troy oz | $1,247 | $15.74 |
| 20 g | 0.6430 troy oz | $2,493 | $31.48 |
| 50 g | 1.6075 troy oz | $6,233 | $78.71 |
| 100 g | 3.2151 troy oz | $12,465 | $157.42 |
| 1,000 g (1 kilogram) | 32.1507 troy oz | $124,654 | $1,574 |
See gold price per kilo and silver price per kilo for the live kilogram figures.
Troy Ounce vs Regular Ounce: What Is the Difference?
The two ounces belong to different systems of weight. The troy system, usually traced to the medieval trade fairs of Troyes in France, has 12 ounces to its pound and 480 grains to its ounce. The avoirdupois system used for everyday goods has 16 ounces to its pound and 437.5 grains to its ounce.
So the troy ounce is the heavier ounce and the troy pound is the lighter pound: 373.24 grams against 453.592. The precious metals trade kept the troy ounce and dropped the troy pound, which is why gold is never quoted by the pound today.
To convert a kitchen-scale reading, multiply everyday ounces by 0.9115 to get troy ounces, or switch the scale to grams and divide by 31.1035. The gold price per pound page works through the pound conversion.
Pennyweights, Grains, Tolas and Other Gold Weights
Jewelers, refiners and bullion markets in different countries use a handful of other units. All of them convert to grams and troy ounces by fixed factors.
| Unit | Weight in grams | In troy terms |
|---|---|---|
| Troy ounce | 31.1035 g | The unit gold, silver, platinum and palladium are priced in |
| Everyday (avoirdupois) ounce | 28.3495 g | The ounce on kitchen and postal scales; 0.9115 troy oz |
| Pennyweight (dwt) | 1.5552 g | 1/20 of a troy ounce; used by US jewelers and scrap buyers |
| Grain | 0.0648 g | 480 grains make a troy ounce |
| Tola | 11.6638 g | 0.375 troy oz; used in South Asia and the Gulf |
| Troy pound | 373.24 g | 12 troy ounces; a historical unit no longer used in the market |
| Everyday pound | 453.592 g | 16 everyday ounces, or 14.5833 troy ounces |
| Kilogram | 1,000 g | 32.1507 troy ounces |
The site has live prices in most of these: gold per pennyweight, gold per tola and silver per tola.
Why Does a 1 oz Gold Coin Weigh More Than 31.1 Grams?
Some do. A 1 oz American Gold Eagle or Krugerrand is 22 karat gold, alloyed with copper (and, in the Eagle, a little silver) for hardness, and weighs 33.93 grams. The coin still contains exactly one troy ounce (31.1035 grams) of pure gold; the extra weight is the alloy. Pure 24 karat coins such as the Gold Maple Leaf and the American Gold Buffalo weigh 31.1 grams. The gold coin prices page compares them.
Published by MetalCharts, a free precious metals resource providing real-time prices, interactive charts, educational guides, and portfolio management tools. All market data sourced from COMEX, LBMA, and LME.
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