Karat Purity Calculator (By Ratti, Grams Output) — Sarafa Bazar Tool
This variant of the karat purity calculator takes the input weight in ratti (the smallest South Asian gold weight, 1 ratti = 0.1215 g) and returns the pure gold content + alloy mass in grams. It is the reckoning used in Karachi and Lahore Sarafa Bazar when weighing small pieces, stone-set jewellery and gold scrap.
Use this when you have a ratti-denominated weight slip from a jeweller (typical for ornaments under 1 tola) and need the international gram-equivalent for valuation, customs, or refining intake.
When to use this calculator
- Small jewellery weighed in ratti — earrings, nose pins, small chains.
- Stone-set ornaments — net weight after deducting stone weight is often ratti-denominated.
- Old family jewellery — pre-decimal weights typically recorded in masha/ratti.
Ratti-Input Karat Purity: Small-Piece Gold Valuation
Many small gold pieces — earrings, nose pins, thin chains — are weighed and quoted in ratti at South Asian jewellery counters. 1 ratti = 0.1215 g, making it the smallest practical unit in Sarafa Bazar trade. Calculating karat purity from a ratti weight requires converting to grams first (ratti × 0.1215), then applying the karat ratio — this calculator automates both steps and returns the result in grams.
The ratti-to-grams direction is appropriate when the downstream valuation, customs declaration or refiner intake form requires metric gram weights. The equivalent calculation returning output in tola/masha/ratti is available via the ratti-input tola-output karat purity calculator.
For small pieces under 1 ratti (0.1215 g), milligrams are the more practical unit. For pieces above 12 masha (1 tola), the standard tola karat purity calculator is the natural starting point.
Ratti → grams pure gold
Pure gold (g) = (Ratti × 0.1215) × (Karat ÷ 24). Example: 8 ratti at 22K = 8 × 0.1215 × (22/24) = 0.972 × 0.9167 = 0.891 g pure gold.
Step-by-step calculation
Example: 16 ratti of 22K gold
- 1
Convert ratti to grams
grams = ratti × 0.1215
16 × 0.1215 = 1.944 g
- 2
Find the karat ratio
ratio = karat ÷ 24
22 ÷ 24 = 0.9167
- 3
Pure gold mass
pure (g) = grams × ratio
1.944 × 0.9167 = 1.782 g pure
- 4
Alloy mass
alloy = gross − pure
1.944 − 1.782 = 0.162 g alloy
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Sample conversions
| Input | Result |
|---|---|
| 8 ratti at 24K | 0.972 g pure (= 1 masha) |
| 8 ratti at 22K | 0.891 g pure gold |
| 96 ratti (1 tola) at 22K | 10.692 g pure gold |
| 20 ratti at 18K | 1.822 g pure gold |
Quick Reference — Ratti Input to Pure Gold (Grams)
| Ratti Weight | At 24K |
|---|---|
| 1 ratti | 0.1215 g pure |
| 4 ratti | 0.486 g pure |
| 8 ratti (1 masha) | 0.972 g pure |
| 16 ratti (2 masha) | 1.944 g pure |
| 48 ratti (6 masha) | 5.832 g pure |
| 96 ratti (1 tola) | 11.664 g pure |
1 ratti = 0.1215 g. Pure gold = ratti × 0.1215 × (karat ÷ 24).
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Frequently asked questions
How many ratti in 1 tola?
96 ratti = 1 tola = 11.664 g. So 1 ratti = 11.664 ÷ 96 = 0.1215 g. Within the hierarchy: 8 ratti = 1 masha, 12 masha = 1 tola.
Why is purity calculated in grams when I weighed in ratti?
International gold pricing is gram-denominated. The calculator converts ratti to grams internally before applying the karat ratio, ensuring consistency with global standards and enabling live XAU/USD money-value output.
What is the money value of 8 ratti of 22K gold?
8 ratti = 0.972 g (1 masha). At 22K, pure gold = 0.972 × (22/24) = 0.891 g. At $4,500/oz spot, that is approximately $4,500 ÷ 31.1035 × 0.891 ≈ $129 USD. The calculator gives a live figure in your local currency.
Is ratti used in any other precious-metal trade besides gold?
Historically, ratti was used for silver and gemstones as well in South Asian bazaars. In gemology, the "ratti" is sometimes used for semi-precious stones in Indian markets (where 1 ratti ≈ 0.91 carats). For gold, the 0.1215 g standard applies; for stones, the carat (0.2 g) is the modern international unit.
How do I convert a ratti weight to grams without a calculator?
Multiply ratti by 0.1215. Quick approximation: 8 ratti ≈ 1 g (actual is 8 × 0.1215 = 0.972 g, about 3% under 1 g). For exact bookkeeping always use 0.1215 g/ratti.
Why do some jewellers weigh small pieces in ratti instead of masha?
Ratti gives finer granularity for small pieces under 1 masha (0.972 g) — earrings, nose pins, thin chains. Quoting "6 ratti" is more precise than "0.75 masha" for a customer-facing receipt and avoids fractional masha notation.
Related calculators
These tools cover neighbouring steps in the same workflow — pair them with this one for a complete calculation.