Metal weight unit converter for jewelry professionals. Convert between grams, troy ounces, pennyweights, and carats. Includes volume estimation by metal density.
- Converts between grams, troy ounces, pennyweight (dwt), and carats
- Volume estimation by metal type (gold, silver, platinum, palladium)
- Supports 24K, 18K, 14K, 10K gold densities
- Quick reference table for common conversions
- Free to use, no signup required
Free Tool
Metal Weight Calculator
Convert between grams, troy ounces, pennyweights, and carats. Includes volume estimation by metal type.
Input
Conversions
Density of Gold (24K): 19.32 g/cm³
Quick Reference
1 Troy Ounce
= 31.1035 Grams
1 Pennyweight
= 1.55517 Grams
1 Carat
= 0.200 Grams
Common questions
A pennyweight equals 1.555 grams or 1/20 of a troy ounce. It's the standard weight unit used by jewelers and gold buyers in the US. When a dealer quotes a price 'per pennyweight,' divide the troy ounce price by 20 to compare.
Divide grams by 31.1035. For example, 10 grams of gold equals 0.3215 troy ounces. This converter handles the math for you, including conversions to pennyweight and carats.
Different metals have different densities. Platinum (20.1 g/cm³) is denser than gold (19.3 g/cm³), which is denser than silver (10.4 g/cm³). The same weight of silver takes up nearly twice the volume of the same weight of gold.
Carat (ct) is a unit of weight used for gemstones. One carat equals 0.2 grams. Karat (K or kt) measures gold purity: 24K is pure gold, 14K is 58.3% gold. Same word, different meaning depending on whether you're weighing a stone or grading a metal.
A women's gold band typically weighs 2-4 grams. A men's band runs 5-8 grams. A solitaire engagement ring (with setting) is usually 3-6 grams. Heavy cocktail rings or signet rings can reach 10-15 grams. Weight depends on ring size, width, thickness, and whether it's solid or hollow.