Gold Calculator

Calculate the estimated value of your gold based on its weight, karat purity, and the current gold spot price. Enter weight in grams, troy ounces, or pennyweights, choose your karat (10K to 24K), and get the pure gold content and estimated melt value instantly.

Gold Value Calculator

How to Calculate Gold Value

Gold value depends on three factors: weight, purity (karat), and the current spot price. The spot price is quoted in US dollars per troy ounce (1 troy oz = 31.1035 grams). To find the melt value:

1. Convert weight to grams - 1 troy oz = 31.1035 g - 1 pennyweight (dwt) = 1.55517 g - 1 avoirdupois oz = 28.3495 g 2. Find pure gold weight: Pure gold (g) = Total weight (g) × Purity fraction 3. Calculate value: Value = Pure gold (g) × (Spot price / 31.1035) Example: 10g of 18K gold at $2,000/ozt spot price Purity = 18/24 = 0.75 Pure gold = 10 × 0.75 = 7.5 g Value/g = $2000 / 31.1035 = $64.30/g Value = 7.5 × $64.30 = $482.27

Gold Karat Purity Reference

KaratPurityTypical Use
24K99.9%Bullion coins, bars
22K91.6%Coins, high-end jewelry
18K75.0%Fine jewelry (most common)
14K58.3%Jewelry (US standard)
10K41.7%Jewelry (minimum US legal "gold")

Frequently Asked Questions

What is a troy ounce?+
A troy ounce is the standard unit for precious metals and weighs 31.1035 grams — slightly heavier than a regular (avoirdupois) ounce, which is 28.35 grams. Gold spot prices are always quoted per troy ounce.
Will I get the spot price when selling gold?+
No. Buyers (pawn shops, gold dealers, refiners) typically pay 70–90% of the melt value. The difference covers their processing, refining, and profit margin. Online gold buyers often pay better rates than local pawn shops.
How do I find the karat of my gold?+
Most gold jewelry has a hallmark stamped inside a ring band or on a clasp. Common stamps: 417 (10K), 585 (14K), 750 (18K), 916 (22K), 999 (24K). If you can't find a stamp, a jeweler can test the purity with acid or an electronic tester.

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