Data Source
Live spot gold prices are sourced from goldapi.io, queried in GBP against the XAU (gold) symbol. This is a live wholesale/interbank-style spot price, not a retail dealer quote.
Update Frequency
The price is refreshed three times per day via an automated job. Every page always shows the exact "Last refreshed" timestamp of the data currently displayed. If the live feed is temporarily unavailable, the site falls back to the last known price and shows a clear "using cached rate" banner rather than a broken or zeroed page.
Calculation Formula
price_per_gram(22k, 21k, 18k, 14k) = goldapi.io's own per-carat quote field (its true fine-gold ratio, not a fixed rounded fraction)
price_per_gram(9ct) = price_per_gram(24k) × 0.375 (fallback formula, used because goldapi.io has no 9ct field)
scrap_estimate(purity) = price_per_gram(purity) × dealer_discount_factor
The reference fractions in the table below are shown for comparison and used only as a fallback if goldapi.io's live per-carat field is ever missing — in normal operation, 22k/21k/18k/14k prices come directly from goldapi.io's own quote for that carat, which can differ very slightly (typically under 0.3%) from a simple 24k × nominal-hallmark-fraction calculation.
Purity Fractions — Reference & Fallback Values
| Purity | Hallmark | Reference fraction | Price source |
|---|---|---|---|
| 24 Carat | 999 | 1 | Direct goldapi.io field |
| 22 Carat | 916 | 0.9167 | Direct goldapi.io field |
| 21 Carat | 875 | 0.875 | Direct goldapi.io field |
| 18 Carat | 750 | 0.75 | Direct goldapi.io field |
| 14 Carat | 585 | 0.585 | Direct goldapi.io field |
| 9 Carat | 375 | 0.375 | 24k × fraction (fallback formula) |
Scrap / Dealer Discount
The scrap gold estimate applies a configurable discount factor (currently 0.85) to the live per-gram price. This is explicitly an estimate, not a market rule — real dealer offers vary by purity, weight sold and the individual dealer. Always get a real quote before selling.
Who Runs This Site
Gold Price Per Gram UK is an independent calculator site. It is not a dealer, refiner or financial adviser, and prices shown are indicative only — always confirm with a dealer or jeweller before any transaction.