Convert Micrograms to Kilograms
1 microgram (µg) equals 1 × 10⁻⁹ kilograms (kg).
1 µg = 1e-9 kg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk microgram to kilogram converter to paste a column from Excel.
How to Convert Microgram to Kilogram
- 1 µg = 1 × 10⁻⁹ kg
- 1 kg = 1000000000 µg
- Example: convert 15 µg to kg: 15 µg = 15 × 1 × 10⁻⁹ kg = 1.5 × 10⁻⁸ kg
Formula
kg = µg ÷ 1000000000
Derivation from SI units:
- 1 µg = 10⁻⁹ kg = 10⁻³ mg
- SI base unit, fixed by the Planck constant h = 6.626 070 15 × 10⁻³⁴ J·s
Both units are defined exactly, so the factor is exact. Microgram definition: microgram; Kilogram definition: kilogram.
Worked examples
- A reading of 50 µg converts to 5 × 10⁻⁸ kg.
50 µg × 1 × 10⁻⁹ = 5 × 10⁻⁸ kg - A value of 250 µg is 2.5 × 10⁻⁷ kg.
250 µg × 1 × 10⁻⁹ = 2.5 × 10⁻⁷ kg
Microgram to Kilogram conversion table
| Micrograms (µg) | Kilograms (kg) |
|---|---|
| 0.1 µg | 1 × 10⁻¹⁰ kg |
| 1 µg | 1 × 10⁻⁹ kg |
| 5 µg | 5 × 10⁻⁹ kg |
| 10 µg | 1 × 10⁻⁸ kg |
| 25 µg | 2.5 × 10⁻⁸ kg |
| 50 µg | 5 × 10⁻⁸ kg |
| 100 µg | 1 × 10⁻⁷ kg |
| 125 µg | 1.25 × 10⁻⁷ kg |
| 150 µg | 1.5 × 10⁻⁷ kg |
| 200 µg | 2 × 10⁻⁷ kg |
| 250 µg | 2.5 × 10⁻⁷ kg |
| 400 µg | 4 × 10⁻⁷ kg |
| 500 µg | 5 × 10⁻⁷ kg |
| 1000 µg | 0.000001 kg |
| 5000 µg | 0.000005 kg |
Where it's used
Micrograms are used for vitamins and trace nutrients (vitamin D, B12, folate), while kilograms appear in body weight and food packaging. 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 kilograms are in 1 microgram?
1 µg = 1 × 10⁻⁹ kg.
How do I convert micrograms to kilograms?
Multiply the value in µg by 1 × 10⁻⁹, or divide it by 1000000000. For example, 15 µg × 1 × 10⁻⁹ = 1.5 × 10⁻⁸ kg.
Is the µg to kg conversion exact?
Yes. Both units are defined exactly, and 1 µg is exactly 1 × 10⁻⁹ kg.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Section 2.3.1, base unit definitions.
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 Kilograms. Retrieved October 17, 2026, from https://scientificconverters.com/mass/micrograms-to-kilograms/
IEEE
Scientific Converters, "Convert Micrograms to Kilograms," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/micrograms-to-kilograms/