Gold Analyzer (Grams) — Karat, Impurity & Live Value All-in-One
A gold analyzer is a one-screen valuation tool that takes a gross gram weight + karat purity and returns: pure gold content, alloy/impurity mass, purity percentage, hallmark fineness number (999/916/875/750), and the money value at the live international XAU/USD spot rate converted to 100+ currencies.
It is what scrap-gold dealers, pawnbrokers and jewellery valuers run for every piece walked into their shop. The full calculation in one number set means no back-of-envelope mental math at the counter.
When to use this calculator
- Scrap-gold counter quotes
- Insurance appraisal
- Refiner intake estimation
- Pawn-loan calculation
All-in-One Valuation: What Dealers Need at the Counter
A gold buyer's counter is under time pressure. A customer walks in with a piece; the dealer needs to determine karat, weigh it, compute pure gold content, estimate alloy, derive a money value at the live rate, and make a buy offer — all in under 60 seconds. Three separate calculations run on a phone significantly slow this process and introduce transcription errors between steps. The gold analyzer consolidates all four outputs into a single form submission.
The same logic applies to jewellery valuers writing insurance appraisals, pawnbrokers calculating loan security values, and refinery intake staff logging daily receipts. In each case, the piece's weight and karat are the inputs, and the pure-gold value at live market rates is the single output that drives the decision. Additional outputs — alloy mass, fineness number, purity percentage — appear automatically without extra steps.
For scrap gold batches containing mixed karats, run a separate analyzer calculation per karat group and sum the pure-gold totals. The average rate calculator can then derive the weighted-average cost basis if the batch was acquired across multiple purchases at different prices.
All four outputs at once
Pure = Gross × (karat/24); Impurity = Gross × ((24−karat)/24); Purity % = (karat/24) × 100; Money value = Pure grams × (live XAU/USD ÷ 31.1035) × FX rate.
Step-by-step calculation
Example: 10 g of 22K gold
- 1
Pure gold mass
pure (g) = gross × (karat ÷ 24)
10 × (22÷24) = 9.167 g pure
- 2
Alloy mass
alloy (g) = gross − pure
10 − 9.167 = 0.833 g alloy
- 3
Purity % and fineness
purity % = karat ÷ 24 × 100 → fineness = purity × 10
91.67% → 916 fine
- 4
Exact karat from analysis
karat = (pure ÷ gross) × 24
(9.167 ÷ 10) × 24 = 22.000K
- 5
Tola equivalent
tola = grams ÷ 11.664
10 ÷ 11.664 = 0.8573 tola gross
Sample conversions
| Input | Result |
|---|---|
| 20 g of 22K | Pure 18.33 g, Alloy 1.67 g, 91.67% pure, 916 fineness |
| 50 g of 18K | Pure 37.5 g, Alloy 12.5 g, 75% pure, 750 fineness |
| 100 g of 14K | Pure 58.3 g, Alloy 41.7 g, 58.33% pure, 583 fineness |
Quick Reference — Karat Analysis Summary
| Karat | Purity / Fineness |
|---|---|
| 24K | 99.99% / 999 |
| 22K | 91.67% / 916 |
| 21K | 87.50% / 875 |
| 18K | 75.00% / 750 |
| 14K | 58.33% / 585 |
| 10K | 41.67% / 417 |
| 9K | 37.50% / 375 |
Multiply pure-gold grams × (live XAU/USD ÷ 31.1035) × FX rate for live money value.
Frequently asked questions
What does "fineness" mean compared to karat?
Fineness is parts-per-thousand. 916 fineness = 91.6% pure = 22K. 999 = 24K. Most modern hallmarks stamp fineness (not karat) — the analyzer displays both so you can match either to the piece's stamp.
What is the difference between the Gold Analyzer and the Karat Purity calculator?
The Gold Analyzer is a superset of the Karat Purity calculator. It outputs pure gold mass, alloy mass, purity %, fineness number and live money value all in one screen. The Karat Purity calculator focuses on pure-gold content only, without the alloy and value outputs.
How do I use the Gold Analyzer for a piece with no hallmark?
First get an acid or XRF test from a jeweller or scrap dealer (usually free or ₨200–500). Once you have the karat, enter it with the gross weight. Without a verified karat, any analysis is an estimate only — do not use the value figure for a financial transaction.
What is the "melt value" shown by the analyzer?
Melt value is the theoretical value of the pure gold content at the live international spot price — what the metal is worth if refined to 24K bullion. Actual buy offers from scrap dealers are typically 75–90% of melt value after their refining and margin deductions.
How do I handle a mixed-karat batch in the analyzer?
Run a separate analysis for each karat group. Sum the pure-gold grams across all groups to get total pure-gold content, then compute money value from the summed pure gold at the 24K rate. Do not average karats — use the weighted-average approach instead.
Does the analyzer account for gemstone weight in set jewellery?
No — the analyzer uses the gross weight as entered. For set jewellery, subtract the estimated stone weight first to get the net gold weight. A jeweller or assayer can dewight stones on a balance; stone weights are often noted on the original invoice.
Related calculators
These tools cover neighbouring steps in the same workflow — pair them with this one for a complete calculation.