Carats (ct) to Grams (g) Converter
Enter a value to instantly convert between weight units.
1 Carat = 0.2 Gram
Key Formulas
Kilogram → Pound
lb = kg × 2.20462Pound → Kilogram
kg = lb × 0.453592Gram → Ounce
oz = g × 0.035274Ounce → Gram
g = oz × 28.3495Formula
g = ct × 0.2The carat is defined as exactly 0.2 grams, making conversions to and from grams straightforward. This unit dates to ancient times when carob seeds were used as weight references — they happened to be surprisingly uniform. Today, the metric carat is universal, and gemologists convert between carats and grams constantly: for pricing, inventory, and grading reports.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A jeweler setting a 5-carat center stone knows the gemstone weighs 1 gram — important for the prong design.
5 ct = 1 g
A jewelry manufacturer ordering 100 carats of small accent stones receives 20 grams of material.
100 ct = 20 g
A customer asking about a 1-carat diamond learns it weighs 0.2 grams — about the weight of a small paperclip.
1 ct = 0.2 g
A diamond grading report lists 50 carats total weight — 10 grams for the documentation.
50 ct = 10 g