Gold Impurity Calculator (Tola) — Alloy Mass for South Asian Pieces
The tola-input variant of the gold impurity calculator returns alloy/impurity content in tola, masha and ratti — matching the units local jewellers use to settle refining trade-ins. A 5 tola 22K piece contains 0.417 tola (4 masha) of alloy that will not survive refining to 999 fine gold.
Knowing the impurity figure before sending pieces to a refiner protects against undervaluation and lets you compare quotes between refiners on a like-for-like basis.
Impurity in tola
Impurity (tola) = Gross tola × (24 − karat) ÷ 24. Convert remainder to masha (× 12) and ratti (× 96) as needed.
Sample conversions
| Input | Result |
|---|---|
| 1 tola of 22K | 0.083 tola (≈1 masha) impurity |
| 2 tola of 18K | 0.5 tola (6 masha) impurity |
| 5 tola of 21K | 0.625 tola (7.5 masha) impurity |
When to use this calculator
- Refiner trade-in pre-check
- Family-piece valuation before resale
- Karachi/Mumbai Sarafa settlement
Frequently asked questions
Does the refiner pay me for the alloy mass?
Generally only a small credit — alloy metals (copper, silver, zinc) trade at a fraction of gold's value. Some refiners include a fixed by-product credit; others charge a refining fee that nets out the alloy value.