SilverGoldInvestor.com Precious Metals Investing Education

Free precious metals tool

Troy Ounce Converter for Gold and Silver Weights

Convert between troy ounces, grams, kilograms, ordinary ounces, grains, and pennyweight without confusing precious-metals weight with household ounces.

Educational estimate: This converts units only. It does not measure an item, verify purity, or determine value.

Physical metals research

See How Bullion Products Are Sized and Priced

Compare current gold and silver products sold in grams, fractional troy ounces, and full troy-ounce sizes. Check total delivered cost and product details rather than comparing weight alone.

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How to convert precious-metals weight

Enter a weight and choose source and destination units. The calculator converts through grams using fixed factors.

Precious-metals spot and dealer prices are normally quoted per troy ounce, not ordinary ounce.

Conversion factors

One troy ounce equals 31.1034768 grams, 20 pennyweight, or 480 grains. One ordinary ounce equals 28.349523125 grams.

Use precision appropriate to the physical scale and transaction.

Common troy-ounce conversions

31.1034768 grams equals one troy ounce; one ordinary ounce is about 0.911458 troy ounce.

Frequently Asked Questions

How many grams are in a troy ounce?

One troy ounce equals exactly 31.1034768 grams.

Is a troy ounce the same as a regular ounce?

No. A troy ounce is about 31.1035 grams; an ordinary ounce is about 28.3495 grams.

How many pennyweights are in a troy ounce?

One troy ounce equals 20 pennyweight, abbreviated dwt.

Why are metals measured in troy ounces?

Gold, silver, platinum, and palladium markets traditionally quote weight and prices using the troy system.