How many grams are in a troy ounce?

1 ozt = 31.1035 g. To convert any amount, multiply by 31.1035.

How do you convert troy ounces to grams?

Multiply the number of troy ounces by 31.1035 to get grams. The formula is shown in the "How it's calculated" section above.

Where does the conversion factor come from?

It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.

Unit converter — Gold weight

Troy ounces to grams converter

Convert troy ounces (ozt) to grams (g). Source-cited conversion factor, exact to the displayed precision.

Results are mathematically exact for the displayed precision. How we calculate.

How it's calculated

Convert troy ounces to grams— the formula

Troy ounces convert to grams by multiplying by the published conversion factor. The factor below is exact to the precision shown, sourced from the citation under the formula.

g = ozt × 31.1035

ozt = g × 0.032151

Troy weight system, ISO 31-3: 1 troy oz = 31.1034768 g; 1 dwt (pennyweight) = 1/20 troy oz = 1.55517384 g; 1 grain = 1/24 dwt = 0.06479891 g (NIST SP 811).

Questions

Frequently asked questions

How many grams are in a troy ounce?
1 ozt = 31.1035 g. To convert any amount, multiply by 31.1035.
How do you convert troy ounces to grams?
Multiply the number of troy ounces by 31.1035 to get grams. The formula is shown in the "How it's calculated" section above.
Where does the conversion factor come from?
It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.