Gold Purity Calculator
Estimate gold value by purity, weight and a 24K price.
Gold purity calculator
Gold purity changes the amount of pure gold contained in an item. Use this calculator to compare common karat levels and estimate the pure-gold portion of a weight.
How it works
Enter your values, choose the relevant units or options, and review the calculated result. For financial and market tools, displayed figures are calculations and can differ from provider quotes, fees, spreads, taxes or local rules.
Frequently asked questions
What does 24K gold mean?
24K represents very high-purity gold, commonly treated as 99.9% or close to it for calculations, depending on the product standard.
How much pure gold is in 22K?
22K gold is approximately 91.67% gold by mass.
Why is 18K different from 24K?
18K contains 75% gold by mass, with the remainder made up of other metals.