Gold purity calculator
22 karat gold has a fineness of 916.7 parts per 1,000, which the BIS hallmark marks as 916. Enter a karat and a weight to see the pure gold content.
Results update as you type. Nothing you enter is stored.
| Grade | Hallmark fineness | Gold % |
|---|---|---|
| 24K | 995 | 99.5% |
| 23K | 958 | 95.8% |
| 22K | 916 | 91.6% |
| 20K | 833 | 83.3% |
| 18K | 750 | 75.0% |
| 14K | 585 | 58.5% |
Grades from IS 1417:2016 as listed in the BIS hallmarking FAQ (Q4).
How it works
Karat expresses purity in 24 parts: 24K is (nearly) pure, 22K is 22 parts gold in 24. Fineness expresses the same in parts per 1,000, which is what the BIS hallmark stamps. Hallmark grades are fixed values such as 916 for 22K and 750 for 18K.
Formula
Fineness = karat / 24 x 1,000; pure gold = weight x fineness / 1,000
Frequently asked questions
What does 916 gold mean?
22 karat gold: 916 parts gold per 1,000, the BIS hallmark grade for 22K.
Is 24K gold 100% pure?
Close: the BIS grade 24K is marked 995 and IBJA quotes 999.
Which purity grades can be hallmarked?
BIS lists 14K (585), 18K (750), 20K (833), 22K (916), 23K (958) and 24K (995).
Related
This tool is for information only and is not investment, tax or legal advice. Results depend on the inputs and assumptions you enter; check important figures with the official source or a qualified professional.