Micrograms (μg) to Carats (ct) Converter
Enter a value to instantly convert between weight units.
1 Microgram = 0 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 = μg × 0.000005A carat is exactly 200,000 micrograms (200 mg × 1000). This is a fundamental conversion in the gemstone industry — jewelers work with both units, converting between them constantly: a 500,000 μg diamond is 2.5 carats, and a 100 μg gold granule is 0.0005 carats.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A gemologist weighing a 200,000 μg diamond knows it's exactly 1 carat — useful for quick reference.
200000 μg = 1 ct
A jewelry designer measuring 500,000 μg of a gemstone notes it as 2.5 carats for the spec.
500000 μg = 2.5 ct
A diamond grading report showing 100,000 μg weight records 0.5 carats — a half-carat stone.
100000 μg = 0.5 ct
A jewelry manufacturer weighing 1 gram (1,000,000 μg) of melee diamonds reports 5 carats for inventory.
1000000 μg = 5 ct