Gold Weight Converter
Convert precious metal weight between troy ounces, grams, pennyweight, tola, baht, and grains.
For jewelers, bullion dealers, and investors in gold and silver.
Type in any field — the others update instantly.
Gold and precious metals use the troy weight system, not the everyday avoirdupois system.
Base unit: grams
Troy system:
- 1 troy ounce = 31.1035 grams
- 1 pennyweight (dwt) = 1.55517 grams = 1/20 troy ounce
- 1 troy pound = 373.242 grams = 12 troy ounces
- 1 grain = 0.06480 grams
- 1 troy ounce = 480 grains = 20 pennyweight
Regional gold units:
- 1 tola (India) = 11.6638 grams = 3/8 troy ounce
- 1 baht (Thailand) = 15.244 grams
- 1 mesghal (Iran) = 4.6083 grams
- 1 tael (Hong Kong) = 37.429 grams
Troy vs. avoirdupois:
- 1 troy ounce = 31.103 g (heavier)
- 1 regular ounce = 28.350 g (lighter)
When gold prices are quoted “per ounce,” it always means troy ounces.