Convert Carats to Micrograms
1 carat (ct) equals 200000 micrograms (µg).
1 ct = 200000 µg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk carat to microgram converter to paste a column from Excel.
How to Convert Carat to Microgram
- 1 ct = 200000 µg
- 1 µg = 0.000005 ct
- Example: convert 15 ct to µg: 15 ct = 15 × 200000 µg = 3000000 µg
Formula
µg = ct × 200000
Derivation from SI units:
- 1 ct = 200 mg (metric carat, exact)
- 1 µg = 10⁻⁹ kg = 10⁻³ mg
- 1 ct = 0.0002 kg ÷ 1 × 10⁻⁹ kg per µg = 200000 µg
Both units are defined exactly, so the factor is exact. Carat definition: carat; Microgram definition: microgram.
Worked examples
- A reading of 0.75 ct converts to 150000 µg.
0.75 ct × 200000 = 150000 µg - A value of 3 ct is 600000 µg.
3 ct × 200000 = 600000 µg
Carat to Microgram conversion table
| Carats (ct) | Micrograms (µg) |
|---|---|
| 0.1 ct | 20000 µg |
| 0.25 ct | 50000 µg |
| 0.5 ct | 100000 µg |
| 0.75 ct | 150000 µg |
| 1 ct | 200000 µg |
| 1.5 ct | 300000 µg |
| 2 ct | 400000 µg |
| 3 ct | 600000 µg |
| 5 ct | 1000000 µg |
| 10 ct | 2000000 µg |
| 100 ct | 20000000 µg |
Where it's used
Carats are used for diamonds and gemstones, while micrograms appear in vitamins and trace nutrients (vitamin D, B12, folate). Both measure mass (commonly called weight), so the conversion is a fixed factor.
Carat to other weight and mass units
| Conversion | 1 ct equals |
|---|---|
| carat to kilogram | 0.0002 kg |
| carat to gram | 0.2 g |
| carat to milligram | 200 mg |
| carat to microgram | 200000 µg |
| carat to metric ton | 2 × 10⁻⁷ t |
| carat to pound | 0.0004409245244 lb |
| carat to ounce | 0.00705479239 oz |
| carat to stone | 0.00003149460888 st |
| carat to short ton | 2.204622622 × 10⁻⁷ ton (US) |
| carat to long ton | 1.968413055 × 10⁻⁷ ton (UK) |
| carat to grain | 3.086471671 gr |
| carat to troy ounce | 0.006430149314 oz t |
Frequently asked questions
How many micrograms are in 1 carat?
1 ct = 200000 µg.
How do I convert carats to micrograms?
Multiply the value in ct by 200000. For example, 15 ct × 200000 = 3000000 µg.
Is the ct to µg conversion exact?
Yes. Both units are defined exactly, and 1 ct is exactly 200000 µg.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "carat, metric".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Carats to Micrograms. Retrieved October 17, 2026, from https://scientificconverters.com/mass/carats-to-micrograms/
IEEE
Scientific Converters, "Convert Carats to Micrograms," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/carats-to-micrograms/