Karat Purity Calculator (Tola, Masha, Ratti) — 24K, 22K, 21K, 18K
The tola-based karat purity calculator computes pure gold content for jewellery weighed in South Asian units. 1 tola = 11.664 grams, 1 masha = 0.972 g, and 1 ratti = 0.1215 g. The calculator takes any mixture of tola/masha/ratti, totals it in grams, then applies the karat ratio to return pure gold mass + money value at live local rates.
It is the standard reckoning used in Pakistani, Indian, Bangladeshi and Nepali bazaars — particularly at Sarafa Bazar (Karachi/Lahore), Zaveri Bazaar (Mumbai), and Tanti Bazar (Dhaka) — where bullion and jewellery are quoted per-tola but stamped with 916, 875 or 750 hallmark codes for purity.
How the calculation works
Pure gold (tola) = Total weight (tola) × (Karat ÷ 24). For a 2 tola 4 masha ring at 22K: 2.333 tola × (22 ÷ 24) = 2.139 tola of pure gold. Convert to grams: 2.139 × 11.664 = 24.95 g pure. Money value = pure mass × live XAU/PKR (or INR / BDT / NPR) tola rate.
Sample conversions
| Input | Result |
|---|---|
| 1 tola of 24K (999) | 1.0000 tola = 11.664 g pure gold |
| 1 tola of 22K (916) | 0.9167 tola = 10.692 g pure gold |
| 1 tola of 21K (875) | 0.8750 tola = 10.206 g pure gold |
| 1 tola of 18K (750) | 0.7500 tola = 8.748 g pure gold |
| 12 masha of 22K | 11.00 masha pure = 10.692 g |
When to use this calculator
- Sarafa Bazar valuation — read the daily tola rate sheet then back-calculate the value of a mixed-karat piece.
- Wedding jewellery audit — check the hallmark + gross weight against the invoice purity claim.
- Karachi/Lahore/Dhaka shop reconciliation — match buy-side and sell-side ledgers in pure-gold equivalent.
- Family-heirloom division — split mixed-karat pieces by pure-gold content rather than by gross tola.
Frequently asked questions
How do I convert masha and ratti to a single karat-purity number?
Add up the masha and ratti to your tola figure first (1 tola = 12 masha = 96 ratti), then apply karat × (k ÷ 24). The calculator does this automatically — you enter tola, masha and ratti separately and it normalises to a single mass before the purity math runs.
Why does my Pakistani 22K ring weigh slightly less in pure gold than my Indian 22K ring of the same gross tola?
Both are 91.67% pure by mass, so the pure-gold weight per tola is identical. Differences come from refining loss, hallmark tolerance (916 actually permits 91.5-92%), and shopkeepers occasionally selling 22K stamped as 916 that is closer to 21.5K. The calculator assumes the stamped karat is accurate.