Kilograms (kg) to Carats (ct) Converter
Enter a value to instantly convert between weight units.
1 Kilogram = 5000 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 = kg × 5000000A carat is a unit of weight used specifically for gemstones, originally defined by the weight of a carob seed (which was surprisingly consistent). Today, one carat equals exactly 0.2 grams (200 milligrams). Since a kilogram is 1000 grams, that means 1 kg = 5,000,000 carats. Diamond prices increase exponentially with carat weight — a 2-carat diamond costs more than twice a 1-carat diamond of the same quality.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A gemologist working with a 1 gram sample needs to express it as 5000 carats for the grading report.
0.001 kg = 5000 ct
A small diamond weighing 500 mg (0.0005 kg) is 2500 carats — useful for the certificate documentation.
0.0005 kg = 2500 ct
A jewelry manufacturer ordering 2 grams of melee diamonds (small accent stones) needs 10,000 carats.
0.002 kg = 10000 ct
A diamond's certified weight of 0.01 kg (10 grams) converts to 50,000 carats for the inventory system.
0.01 kg = 50000 ct