Convert Micrograms to Carats
Convert Micrograms (µg) to Carats (ct) instantly and accurately.
Conversion Formula
ct = µg × 5.000000000e-6
About Micrograms
A microgram (µg or mcg) is one millionth of a gram (10⁻⁶ g). It is the standard dosing unit for potent medications and micronutrients: vitamin B12 recommended daily intake is 2.4 µg, folic acid supplements are 400 µg, and levothyroxine (thyroid medication) doses are typically 25-200 µg. Air quality standards measure fine particulate matter (PM2.5) in micrograms per cubic meter - the WHO guideline is 15 µg/m³ annual mean. A grain of sand weighs about 50-100 micrograms, and a single snowflake approximately 3 micrograms.
About Carats
A metric carat (ct or CD) is exactly 200 milligrams (0.2 g), the universal standard for weighing gemstones. Established internationally in 1907, it replaced fractionally different regional carat weights previously used in different countries. The total weight of a diamond or colored gemstone is always expressed in carats: a 1.00 ct diamond of excellent cut and color can command over $5,000. The Cullinan diamond, the largest gem-quality rough diamond ever found, weighed 3,106.75 carats.
Quick Reference Table
| Micrograms (µg) | Carats (ct) |
|---|---|
| 1 µg | 5 × 10-6 ct |
| 2 µg | 1 × 10-5 ct |
| 5 µg | 2.5 × 10-5 ct |
| 10 µg | 5 × 10-5 ct |
| 25 µg | 0.000125 ct |
| 50 µg | 0.00025 ct |
| 100 µg | 0.0005 ct |