Microgram (µg)
The microgram (µg, often written mcg on labels) is one millionth of a gram.
Symbol: µg (ASCII: ug)
Quantity: mass (commonly called weight)
SI relation: 1 µg = 1 × 10⁻⁹ kg (exact)
Derivation: 1 µg = 10⁻⁹ kg = 10⁻³ mg
Exact: yes, by definition
Typical uses
- Vitamins and trace nutrients (vitamin D, B12, folate)
- Hormone and potent drug doses
- Air pollution concentrations (µg/m³)
Convert micrograms to other units
| Conversion | 1 µg equals | Reverse |
|---|---|---|
| microgram to kilogram | 1 × 10⁻⁹ kg | kilogram to microgram |
| microgram to gram | 0.000001 g | gram to microgram |
| microgram to milligram | 0.001 mg | milligram to microgram |
| microgram to pound | 2.204622622 × 10⁻⁹ lb | pound to microgram |
| microgram to ounce | 3.527396195 × 10⁻⁸ oz | ounce to microgram |
| microgram to metric ton | 1 × 10⁻¹² t | metric ton to microgram |
| microgram to stone | 1.574730444 × 10⁻¹⁰ st | stone to microgram |
| microgram to short ton | 1.102311311 × 10⁻¹² ton (US) | short ton to microgram |
| microgram to troy ounce | 3.215074657 × 10⁻⁸ oz t | troy ounce to microgram |
| microgram to long ton | 9.842065276 × 10⁻¹³ ton (UK) | long ton to microgram |
| microgram to grain | 0.00001543235835 gr | grain to microgram |
| microgram to carat | 0.000005 ct | carat to microgram |
Open the Weight and Mass Converter to convert any value between all units.
Sources
- 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). Microgram (µg). Retrieved October 17, 2026, from https://scientificconverters.com/units/microgram/
IEEE
Scientific Converters, "Microgram (µg)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/microgram/