Silver purity calculator
925 silver is 92.5% pure silver. Enter a fineness and a weight to see the silver content and whether it matches a BIS hallmark grade.
Results update as you type. Nothing you enter is stored.
| BIS grade (fineness) | Silver % |
|---|---|
| 990 | 99.0% |
| 970 | 97.0% |
| 925 | 92.5% |
| 900 | 90.0% |
| 835 | 83.5% |
| 800 | 80.0% |
Grades from IS 2112:2014 as listed in the BIS hallmarking FAQ (Q4).
How it works
Silver purity is expressed as fineness: parts of silver per 1,000. BIS hallmarks silver in six grades under IS 2112:2014: 800, 835, 900, 925, 970 and 990.
Formula
Silver % = fineness / 10; pure silver = weight x fineness / 1,000
Frequently asked questions
What are the BIS hallmark grades for silver?
800, 835, 900, 925, 970 and 990 (IS 2112:2014).
Is 999 silver hallmarked?
The BIS silver grades top out at 990; IBJA quotes a 999 benchmark for bullion.
What does sterling silver mean?
925 fineness, 92.5% silver.
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.