Gold Calculator
Subtract independently measured non-metal weight, enter gold purity as any karat or millesimal fineness, and apply a user-entered spot price, currency label, and payout percentage.
How to use the Gold Calculator
Enter gross and excluded non-metal weight, weight unit, karat or fineness, spot price per troy ounce, currency, and payout percentage.
Review scale accuracy, actual assay, hollow items, stones and findings, troy versus avoirdupois units, price timestamp, currency, and dealer spread.
Read gross grams, pure grams, pure troy ounces, melt value, and estimated payout.
Formula
Net metal weight = gross weight − entered exclusions. Pure gold = net metal weight × karat ÷ 24 or fineness ÷ 1000; melt value = pure troy ounces × entered spot price.
Example
10 g of 18-karat gold contains 10 × 18 ÷ 24 = 7.5 g of pure gold before assay variance.
Assumptions and limitations
- Fineness and spot price are user inputs; the calculator does not authenticate an item, fetch a live price, or estimate collectible value.
- Gold Calculator treats the entered values as estimates and does not infer missing project, account, or personal details.
- Calculations retain working precision except where the cited method requires an intermediate rounding step; displayed values are then formatted separately. Source rules and dated rates must be rechecked when they change.
Sources
- LBMA: Precious Metal PricesBenchmark precious-metal price context and troy-ounce quotation. Reviewed 2026-08-14.
- National Institute of Standards and Technology: SI Units — LengthLength, area, volume, and unit-conversion conventions. Reviewed 2026-08-14.
- National Institute of Standards and Technology: Precious Metals Conversion InformationOfficial formula, rate, or program guidance used by this calculator. Reviewed 2026-08-14.
- Federal Trade Commission: Buying Platinum, Gold, and Silver JewelryOfficial formula, rate, or program guidance used by this calculator. Reviewed 2026-08-14.
- Commodity Futures Trading Commission: 10 Things to Ask Before Buying Physical Gold, Silver, or Other MetalsOfficial formula, rate, or program guidance used by this calculator. Reviewed 2026-08-14.
Related precious metals calculators
Frequently asked questions
How does the Gold Calculator work?
Net metal weight = gross weight − entered exclusions. Pure gold = net metal weight × karat ÷ 24 or fineness ÷ 1000; melt value = pure troy ounces × entered spot price.
What information should I enter in the Gold Calculator?
Enter gross and excluded non-metal weight, weight unit, karat or fineness, spot price per troy ounce, currency, and payout percentage, then verify scale accuracy, actual assay, hollow items, stones and findings, troy versus avoirdupois units, price timestamp, currency, and dealer spread.
What should I verify before using this Gold Calculator result?
Fineness and spot price are user inputs; the calculator does not authenticate an item, fetch a live price, or estimate collectible value.
Reviewed 2026-08-14 · user-priced-net-metal-v2 · content-2026-08-14 · Trusty Calculator Editorial Team