Troy Ounce vs Gram: Gold Weight Conversion
Gold uses troy ounces, jewelry often uses grams, and mixing the two can change your estimate.
The key conversion
One troy ounce of gold equals 31.1035 grams. This is the number used when turning a quoted gold spot price into a gold price per gram. A regular avoirdupois ounce is about 28.35 grams, so using the wrong ounce can make a gold estimate noticeably inaccurate.
Why gold uses troy ounces
Precious metals are traditionally priced in troy ounces. Jewelry scales, however, often show grams because grams are easier for small rings, chains, and coins. A good gold calculator should handle both units and convert them before applying karat purity.
How to avoid mistakes
Check whether a buyer quote is based on grams, pennyweights, regular ounces, or troy ounces. Then compare all offers in the same unit. When in doubt, convert the weight first, then calculate purity and price.
Key points
One troy ounce equals 31.1035 grams. A regular ounce is not the same as a troy ounce. Use one unit consistently when comparing gold values.