Convert Micrograms to Carats
1 microgram (µg) equals 0.000005 carats (ct).
1 µg = 0.000005 ct
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk microgram to carat converter to paste a column from Excel.
How to Convert Microgram to Carat
- 1 µg = 0.000005 ct
- 1 ct = 200000 µg
- Example: convert 15 µg to ct: 15 µg = 15 × 0.000005 ct = 0.000075 ct
Formula
ct = µg ÷ 200000
Derivation from SI units:
- 1 µg = 10⁻⁹ kg = 10⁻³ mg
- 1 ct = 200 mg (metric carat, exact)
- 1 µg = 1 × 10⁻⁹ kg ÷ 0.0002 kg per ct = 0.000005 ct
Both units are defined exactly, so the factor is exact. Microgram definition: microgram; Carat definition: carat.
Worked examples
- A reading of 50 µg converts to 0.00025 ct.
50 µg × 0.000005 = 0.00025 ct - A value of 250 µg is 0.00125 ct.
250 µg × 0.000005 = 0.00125 ct
Microgram to Carat conversion table
| Micrograms (µg) | Carats (ct) |
|---|---|
| 0.1 µg | 5 × 10⁻⁷ ct |
| 1 µg | 0.000005 ct |
| 5 µg | 0.000025 ct |
| 10 µg | 0.00005 ct |
| 25 µg | 0.000125 ct |
| 50 µg | 0.00025 ct |
| 100 µg | 0.0005 ct |
| 125 µg | 0.000625 ct |
| 150 µg | 0.00075 ct |
| 200 µg | 0.001 ct |
| 250 µg | 0.00125 ct |
| 400 µg | 0.002 ct |
| 500 µg | 0.0025 ct |
| 1000 µg | 0.005 ct |
| 5000 µg | 0.025 ct |
Where it's used
Micrograms are used for vitamins and trace nutrients (vitamin D, B12, folate), while carats appear in diamonds and gemstones. Both measure mass (commonly called weight), so the conversion is a fixed factor.
Microgram to other weight and mass units
| Conversion | 1 µg equals |
|---|---|
| microgram to kilogram | 1 × 10⁻⁹ kg |
| microgram to gram | 0.000001 g |
| microgram to milligram | 0.001 mg |
| microgram to metric ton | 1 × 10⁻¹² t |
| microgram to pound | 2.204622622 × 10⁻⁹ lb |
| microgram to ounce | 3.527396195 × 10⁻⁸ oz |
| microgram to stone | 1.574730444 × 10⁻¹⁰ st |
| microgram to short ton | 1.102311311 × 10⁻¹² ton (US) |
| microgram to long ton | 9.842065276 × 10⁻¹³ ton (UK) |
| microgram to grain | 0.00001543235835 gr |
| microgram to troy ounce | 3.215074657 × 10⁻⁸ oz t |
| microgram to carat | 0.000005 ct |
Frequently asked questions
How many carats are in 1 microgram?
1 µg = 0.000005 ct.
How do I convert micrograms to carats?
Multiply the value in µg by 0.000005, or divide it by 200000. For example, 15 µg × 0.000005 = 0.000075 ct.
Is the µg to ct conversion exact?
Yes. Both units are defined exactly, and 1 µg is exactly 0.000005 ct.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- 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".
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 Micrograms to Carats. Retrieved October 17, 2026, from https://scientificconverters.com/mass/micrograms-to-carats/
IEEE
Scientific Converters, "Convert Micrograms to Carats," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/micrograms-to-carats/