Precious Metal Value Calculator
Melt value of gold, silver or platinum from weight, karat or fineness and a spot price you enter, with fine metal weight, price per gram and a buyer offer.
Interactive calculator · Method PRECIOUS-METAL-VALUE-1.0 · Last reviewed: 2026-11-04
Calculate your scenario
Fine metal (troy oz) = item weight in grams × purity ÷ 31.1034768.
Your inputs
Default worked example. Edit the inputs to calculate your scenario.
Default worked example
10 g × 0.5833 purity = 5.8333 g fine ÷ 31.1034768 = 0.1875 troy oz × $2,000.00 = $375.09 melt; 80% payout = $300.07.
How to use the calculator
Choose the metal, enter the item weight and its unit, pick the karat or fineness, then enter today's spot price per troy ounce from a source you trust and the payout % a buyer quotes.
What the result means
10 g of 14k gold holds about 5.8333 g (0.1875 troy oz) of fine gold; at an entered $2,000 per troy ounce the melt value is about $375 and an 80% offer about $300.
Formula and units
Fine metal (troy oz) = item weight in grams × purity ÷ 31.1034768. Melt value = fine troy ounces × the spot price you enter. Buyer offer = melt value × payout %. Karat purity = karat ÷ 24; fineness purity = parts per 1,000 ÷ 1,000. Unit factors: 1 troy oz = 31.1034768 g, 1 dwt = 1.55517384 g, 1 oz avoirdupois = 28.349523125 g.
Worked examples
10 g of 14k gold at $2,000/ozt: Item weight: 10 weight unit; Custom fineness (parts per 1,000): 750 per mille; Spot price you enter per troy ounce (example; not live): 2000 USD per troy oz; Buyer payout (example): 80 % of melt value; Metal: gold; Weight unit: g; Purity: 14.
Example result: Melt value: $375.09; Buyer offer: $300.07; Fine metal weight: 0.1875 troy oz; Fine metal in grams: 5.8333 g; Spot price per gram of fine metal: $64.30; Offer per gram of item weight: $30.01.
5 troy oz of sterling silver at $25/ozt: Item weight: 5 weight unit; Custom fineness (parts per 1,000): 750 per mille; Spot price you enter per troy ounce (example; not live): 25 USD per troy oz; Buyer payout (example): 70 % of melt value; Metal: silver; Weight unit: ozt; Purity: 925.
Example result: Melt value: $115.63; Buyer offer: $80.94; Fine metal weight: 4.625 troy oz; Fine metal in grams: 143.8536 g; Spot price per gram of fine metal: $0.80; Offer per gram of item weight: $0.52.
Limitations and common mistakes
The spot price is whatever you enter; this page does not fetch live prices. Melt value is metal content only, not collectible, numismatic, brand, gemstone or craftsmanship value. Nominal karat purity (for example 14/24) can differ slightly from an item's actual assay, and stones, solder or plating add weight without metal value. Buyer payout percentages vary; the default is an example.
Weighing in ordinary (avoirdupois) ounces but entering them as troy ounces overstates the metal by about 9.7%, since a troy ounce is 31.10 g and an ordinary ounce 28.35 g.
Sources and assumptions
Method PRECIOUS-METAL-VALUE-1.0; last formula review 2026-11-04. Sources and their supported claims. Calculation methodology.