Weight Converter
Carat to Ratti Converter
Instantly convert gemstone weight between Carat, Ratti, Gram and Milligram — type into any field and the rest update as you go.
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Convert Gemstone Weight
Type into any field — the other three update as you go.
Enter a weight to see the equivalents.
Conversion Factors
1 Carat = 0.200 g · 1 Ratti = 0.182 g
Understanding Carat and Ratti
Carat is the internationally standardised unit of weight for gemstones and pearls, fixed at exactly 200 milligrams (0.2 grams). Ratti is the older unit traditionally used across the Indian subcontinent, historically based on the weight of a dried Gunja (Abrus precatorius) seed and taken as roughly 0.182 grams in the modern gem trade.
Why Accurate Conversion Matters
Gemstone prices are quoted per carat or per ratti depending on the market, and even a small rounding error compounds quickly on a high-value stone. Converting precisely protects both buyer and seller — it's the difference between a fair price and an overpayment or an underpriced sale.
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