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Silver Purity Converter Calculator

Work out silver purity converter instantly with clear inputs, formula shown and shareable results.

About Silver Purity Converter Calculator

Silver purity is quoted as fineness in parts per thousand rather than in karats. Sterling silver is 925 - 92.5% silver with 7.5% copper - so a 50 g sterling item holds 46.25 g of silver. Britannia silver is 958 and fine silver 999, which is too soft for tableware but used for bullion.

Formulas

Purity

fraction = fineness / 1000

Silver content

mass of silver = item mass x purity

Worked example

With the default values below, Silver Purity Converter Calculator returns Silver Purity of 92.50%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Silver finenessaccepts 0–1,000
925
Item massminimum 0 g
50 g

Results

Silver Purity
92.50%
Pure Silver Content
46.250 g
Alloying Metal Content
3.750 g
Standard Grade
Sterling silver (925)

Step by step

  1. 1Values used
  2. 2Purity
  3. 3Silver content
  4. 4Silver Purity= 92.50
  5. 5Pure Silver Content= 46.250 g
  6. 6Alloying Metal Content= 3.750 g
  7. 7Standard Grade= Sterling silver (925)

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why is sterling 92.5% rather than pure?

Because 7.5% copper adds the hardness and durability that pure silver lacks, while keeping the colour and tarnish behaviour acceptable.

Does fineness affect tarnishing?

Yes. Copper drives tarnish, so higher fineness tarnishes more slowly. Argentium alloys replace some copper with germanium to reduce it further.

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