Troy ounces to grams.

Answer

1 troy ounce = 31.1034768 grams = 20 pennyweights = 480 grains. To convert troy ounces to grams, multiply by 31.1034768. To convert grams to troy ounces, divide by 31.1034768. 10 g is 0.3215 troy ounces.

Worked example

Convert 10 g to troy units: 10 / 31.1034768 = 0.3215 troy ounces. As pennyweight, 10 / 1.55517384 = 6.4301 dwt, and as troy grains, 10 / 0.06479891 = 154.324 grains.

How it works

Grams = troy ounces x 31.1034768. The troy system defines the grain as 0.06479891 g exactly, with 24 grains to the pennyweight, 20 pennyweights (480 grains) to the troy ounce and 12 troy ounces to the troy pound. The troy ounce is the standard mass unit for precious metals in trade.

Sources and basis (opened 2026-10-08): Wikipedia, Troy weight.

FAQ

How many grams are in a troy ounce?

One troy ounce is 31.1034768 grams.

How many pennyweights are in a troy ounce?

20. A pennyweight is 24 grains, and a troy ounce is 480 grains.

How many grams is a pennyweight?

One pennyweight (dwt) is 1.55517384 grams.

How many troy ounces are in a troy pound?

12. The troy pound is rarely used today.

Is a troy ounce the same as a regular ounce?

No. A troy ounce is heavier than an avoirdupois ounce, and the troy ounce is the standard unit for precious metals.