Convert gold weight from troy ounces to grams using the standard precious-metal conversion. Enter a troy-ounce weight to calculate the equivalent number of grams, then view additional common weight equivalents.
Uses the standard 31.1034768 grams per troy ounce.
This conversion is based solely on mass. Gold purity does not alter the relationship between troy ounces and grams.
One troy ounce of gold equals exactly 31.1034768 grams. This is the standard mass relationship used for precious metals.
To convert a gold weight from troy ounces to grams, multiply the number of troy ounces by 31.1034768.
For example, 3 troy ounces of gold weighs 93.3104304 grams.
The conversion is a direct mass calculation and does not depend on the current gold price or the purity of the metal.
If a gold bar is listed as 2.5 troy ounces:
The same calculation can be used for bullion, coins, jewellery weights, inventory records and other precious-metal measurements.
| Troy Ounces | Grams |
|---|---|
| 0.01 troy oz | 0.311034768 g |
| 0.1 troy oz | 3.11034768 g |
| 0.25 troy oz | 7.7758692 g |
| 0.5 troy oz | 15.5517384 g |
| 1 troy oz | 31.1034768 g |
| 2 troy oz | 62.2069536 g |
| 5 troy oz | 155.517384 g |
| 10 troy oz | 311.034768 g |
| 20 troy oz | 622.069536 g |
| 32.1507466 troy oz | ≈ 1,000 g |
The word "ounce" can refer to different units. This distinction matters when working with gold because precious metals use the troy ounce rather than the ordinary avoirdupois ounce.
| Unit | Mass | Common Application |
|---|---|---|
| Troy ounce | 31.1034768 g | Gold and precious metals |
| Avoirdupois ounce | 28.349523125 g | General commercial goods |
Using a regular ounce conversion for a gold quotation can therefore produce an incorrect weight. For precious metals, the troy-ounce definition should be used.
The troy system is the conventional measurement system used in the precious-metals industry. Gold, silver, platinum and palladium are commonly quoted and traded using troy ounces.
As a result, a gold quotation expressed as a price per ounce normally means price per troy ounce unless the quotation specifically states otherwise.
No. A troy ounce is a unit of mass, so converting it into grams produces the same result regardless of the material's purity.
For example, 1 troy ounce of 24K gold and 1 troy ounce of 18K gold both have a gross mass of 31.1034768 grams.
Their fine-gold content differs because 18K gold contains approximately 75% gold by mass, while 24K material is normally treated as very high-purity gold. Purity matters for fine-gold calculations, not for the basic weight conversion.
When a lower-purity gold alloy is measured, the gross weight includes both gold and alloying metals. Fine-gold weight represents only the gold content.
Suppose a 1 troy-ounce item is 18K:
This illustrates why weight conversion and purity calculation should be treated as separate steps.
Many bullion products are described using troy-ounce denominations. One-troy-ounce bullion products use the troy ounce as the precious-metal weight standard.
A product's total physical weight can sometimes differ from its fine-gold content when the item contains alloy metals. The manufacturer's stated fineness and precious-metal content should therefore be checked when evaluating a specific product.
Converting all products to grams can make listings using different weight systems easier to compare.
Gram-based records can be useful for businesses that maintain stock measurements in metric units.
Converting a quoted troy-ounce weight to grams can help when a price is being compared against a gram-based quotation.
| Weight | Approximate Equivalent |
|---|---|
| 1 troy oz | 31.1034768 g |
| 1 troy oz | 31,103.4768 mg |
| 1 troy oz | 0.0311034768 kg |
| 1 troy oz | ≈ 2.66667 tola |
| 1 troy oz | 20 pennyweight |
| 1 troy oz | 480 grains |
To convert grams back into troy ounces, divide the gram weight by 31.1034768.
For example, 100 grams converts to:
The two formulas are exact inverses when the same conversion constant is used.
This calculator performs a weight conversion only. It does not determine gold purity, authenticity, market value or the amount a dealer will pay for a physical item.
It also does not use live gold prices. If you are comparing bullion or jewellery prices, calculate the weight first and then evaluate the quoted price separately.
For physical gold, always rely on verified measurements and the stated fineness or assay information when making a product-specific assessment.
One troy ounce equals exactly 31.1034768 grams.
Multiply the troy-ounce weight by 31.1034768.
No. A troy ounce is 31.1034768 grams, while a standard avoirdupois ounce is approximately 28.349523125 grams.
10 troy ounces equals 311.034768 grams.
No. The weight conversion is independent of gold purity.
The troy ounce is the conventional precious-metal weight unit used for gold and other precious metals.
Yes. Divide the gram weight by 31.1034768.
No. It is a weight converter and does not require a gold price.