Purity factor
18/24 = 0.75 theoretical gold contentThe 18K reference
18K Gold Price Today
18K gold is modeled as 18/24 pure gold, or 75% theoretical gold content. Compare common weights and calculate a custom estimate without confusing melt value with a resale quote.
18K gold · USD
$103.33per gramData source MetalpriceAPI · Frankfurter reference ratesLast updated Sep 15, 2026, 11:59 PM UTCFX reference date 2026-09-16Status Fresh provider response
Shown by
Gram, troy ounce, and kilogramBest read as
A metal-content estimate, not a resale quoteToday’s reference
Why 18K is a 75% estimate
The 18/24 factor equals 0.75. The remaining alloy content is not priced as pure gold, and a finished jewellery item can carry design, labour, brand, and dealer premiums.
18K value = 24K spot value × 18/24 theoretical purity factor.
Quick reference
18K gold by weight
USD · based on the latest valid spot response
Per gram
| Weight | Theoretical value | Basis |
|---|---|---|
| 1 g | $103.33 | 18K spot / melt estimate |
| 5 g | $516.67 | 18K spot / melt estimate |
| 10 g | $1,033.34 | 18K spot / melt estimate |
| 20 g | $2,066.67 | 18K spot / melt estimate |
| 50 g | $5,166.68 | 18K spot / melt estimate |
| 100 g | $10,333.37 | 18K spot / melt estimate |
Per troy ounce
| Weight | Theoretical value | Basis |
|---|---|---|
| 0.5 troy oz | $1,607.02 | 18K spot / melt estimate |
| 1 troy oz | $3,214.04 | 18K spot / melt estimate |
| 2 troy oz | $6,428.07 | 18K spot / melt estimate |
| 5 troy oz | $16,070.18 | 18K spot / melt estimate |
| 10 troy oz | $32,140.37 | 18K spot / melt estimate |
Per kilogram
| Weight | Theoretical value | Basis |
|---|---|---|
| 1 kg | $103,333.68 | 18K spot / melt estimate |
Values are theoretical spot / melt estimates and may be stale if a provider refresh is delayed. Last updated Sep 15, 2026, 11:59 PM UTC
Gold calculator
What is your gold worth?
Estimate theoretical spot / melt value by weight, purity, and currency. It is not a dealer quote, retail price, or scrap buyer offer.
Estimated gold value
$1,033.34
Based on 18K purity, MetalpriceAPI spot data, and Frankfurter reference rates reference rates. Formula: weight × spot value × purity factor. Actual dealer, jewellery, or buyback prices vary.
Helpful answers
18K Gold Price Today FAQ
What percentage of gold is in 18K?
The theoretical purity factor is 18/24, which equals 75% gold content. The alloy composition of a real item can vary by product standard.
How much is 18K gold worth per gram?
Multiply the current 24K theoretical gold value per gram by 0.75, then convert currencies if needed.
Why can a shop price differ from this result?
This tool estimates metal value only. Shop prices can include craftsmanship, design, retail margin, taxes, testing, and other costs.
What does 18K gold mean for a value estimate?
18K is modeled as 18/24, or a 0.75 theoretical purity factor. The result estimates gold content and is not a finished jewellery appraisal or resale quote.
Information only, not investment advice. Calculations are theoretical spot / melt value estimates and are not dealer offers, retail prices, jewellery valuations, or scrap buyer quotes.