Donaldson R F Free Precious Metals Tools
Melt value, weight, purity and price-ratio calculators for gold, silver and other metals.
5 free tools in this category. No sign-up, no limits.
Gold Purity & Alloy Calculator
Convert gold purity between karat and fineness, and work out the fine gold weight and alloy (other metal) weight in a piece of jewellery.
Open tool →Troy Ounce, Pennyweight & Grain Converter
Convert between troy ounces, pennyweight (dwt), grains, grams and kilograms — the weight units used for precious metals, gemstones and bullion.
Open tool →Precious Metal Melt Value Calculator
Work out the melt value of gold, silver, platinum or palladium jewellery, coins or scrap from its weight, purity and a price you enter yourself.
Open tool →Metal Price Ratios
Compare gold, silver, platinum and palladium by entering your own prices — the gold/silver ratio and every other pair, worked out instantly.
Open tool →Metal Weight & Density Calculator
Work out the weight of a metal from its volume (or the volume from its weight), for copper, aluminium, steel, precious metals and more.
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