Gold Purity Value Calculator

Work out gold purity value instantly with clear inputs, formula shown and shareable results.

About Gold Purity Value Calculator

Karat is a fraction of 24, so pure gold content is weight times karat over 24, and the same figure expressed per thousand gives the hallmark fineness. Fineness marks like 916 or 750 are just the karat fraction to three digits, which makes them directly comparable across markets that use different karat conventions.

Formulas

Pure content

pure grams = weight x karat / 24

Fineness

millesimal fineness = karat / 24 x 1000

Worked example

With the default values below, Gold Purity Value Calculator returns Melt value of the gold of $1,375.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Item weightminimum 0.01 g: 25 g
Karataccepts 1–24 K: 22 K
Pure gold price per gramminimum 0.01: 60

Results

Melt value of the gold: $1,375.00
Pure gold content: 22.9167 g
Purity: 91.67%
Hallmark fineness: 917

Step by step

1Values used
2Pure content
3Fineness
4Melt value of the gold= 1,375.00
5Pure gold content= 22.9167 g
6Purity= 91.67
7Hallmark fineness= 917

Assumptions and limits

The result is derived only from the 3 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 4 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

How is the Gold Purity Value figure worked out?

pure grams = weight x karat / 24. Karat is a fraction of 24, so pure gold content is weight times karat over 24, and the same figure expressed per thousand gives the hallmark fineness.

Why does this matter?

Fineness marks like 916 or 750 are just the karat fraction to three digits, which makes them directly comparable across markets that use different karat conventions.

What do I need to enter?

Enter item weight, karat, pure gold price per gram. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.