Grams (g) to Carats (ct) Converter
Enter a value to instantly convert between weight units.
1 Gram = 5 Carat
Key Formulas
Kilogram → Pound
lb = kg × 2.20462Pound → Kilogram
kg = lb × 0.453592Gram → Ounce
oz = g × 0.035274Ounce → Gram
g = oz × 28.3495Formula
ct = g × (0.001 / 0.0002)Multiply grams by 5 to get carats, because one metric mass carat is 0.2 g by the definition in NIST Appendix B.8. A gram is 0.001 kg under the BIPM SI prefixes. A 2 g stone is 10 ct. The FTC covers gold karat purity, which has no link to carat weight.
Source: NIST exact and named mass definitions (definition-derived arithmetic)
Reviewed by the Convert Calc editorial team · Last reviewed: · see our methodology
Frequently Asked Questions
Real-World Examples
A 1 g loose stone read from a small jeweler's scale.
1 g = 5 ct
A half-gram stone in a jewelry listing.
0.5 g = 2.5 ct
A 10 g strand of beads weighed in grams.
10 g = 50 ct
A 2 g pendant stone.
2 g = 10 ct