Convert weight and mass units — kilograms, pounds, grams, ounces, tons, carats and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 μg | 1.000e-12 kg | |
| 0.01 μg | 1.000e-11 kg | |
| 0.1 μg | 1.000e-10 kg | |
| 1 μg | 1.000e-09 kg | |
| 5 μg | 5e-09 kg | |
| 10 μg | 1e-08 kg | |
| 50 μg | 5e-08 kg | |
| 100 μg | 1e-07 kg | |
| 1000 μg | 1e-06 kg |
The Milligram (mg) and the Gram (g) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 μg = 1.000000e-9 kg
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Microgram (μg) | Kilogram (kg) | Real-world context |
|---|---|---|
| 1 μg | 1.0000e-09 kg | speck of dust |
| 1000 μg | 1.0000e-06 kg | 1 milligram |
| 1,000,000 μg | 0.001 kg | |
| 1.0000e+09 μg | 1 kg | |
| 1.0000e+12 μg | 1000 kg |
1 microgram (μg) equals exactly 1.0000e-09 kilograms (kg). Use the formula: μg × 1.0000e-09 = kg.
To convert micrograms to kilograms, multiply your value in micrograms by 1.0000e-09. For example, 5 μg × 1.0000e-09 = 5.0000e-09 kg.
100 micrograms = 1.0000e-07 kilograms. Calculation: 100 × 1.0000e-09 = 1.0000e-07.
To convert kilograms back to micrograms, divide by 1.0000e-09 (or multiply by 1.0000e+09). Example: 10 kg ÷ 1.0000e-09 = 1.0000e+10 μg.
Yes. This converter uses the internationally recognised exact conversion factor: 1 μg = 1.0000e-09 kg. All calculations are performed in your browser with no rounding until display.
10 micrograms = 1.0000e-08 kilograms. Simply multiply by 1.0000e-09.
Converting micrograms to kilograms is commonly needed for medical dosing, laboratory measurements, pharmaceutical calculations, and quality control testing where one system uses μg and another uses kg.
The microgram (μg, or mcg in medical writing) is a unit of mass equal to one-millionth of a gram (10⁻⁶ g) or one-billionth of a kilogram (10⁻⁹ kg). The symbol "μ" is the Greek letter mu, representing the SI micro- prefix. In clinical settings "mcg" is preferred over "μg" to avoid handwriting confusion between μ and m.
The kilogram (kg) is the SI base unit of mass — one of seven fundamental units in the International System. Equal to exactly 1,000 grams, it is the foundation of weight measurement in science, medicine, engineering, and commerce worldwide. Uniquely among SI base units, the kilogram is named with a metric prefix ("kilo-" = 1,000).
The microgram became essential in the 20th century as analytical chemistry techniques — mass spectrometry, HPLC, immunoassay — allowed measurement and manipulation at sub-milligram scales. Vitamins, hormones, and pharmaceuticals are often active at microgram levels. The discovery that iodine deficiency (corrected by just a few hundred micrograms daily) causes goitre and intellectual disability was a landmark 20th-century public health finding.
Interesting fact: The human daily requirement for vitamin B12 is only 2.4 μg, yet deficiency causes irreversible neurological damage. Vitamin D3 requirement is approximately 15 μg per day.
Defined in 1795 by the French Revolutionary government as the mass of one cubic decimetre of distilled water at 4 °C. A platinum prototype (the Kilogramme des Archives) was created in 1799. From 1889 until 2019, the world's mass standard was the International Prototype Kilogram — a platinum-iridium cylinder stored in Sèvres, France. In 2019, the kilogram was redefined in terms of Planck's constant (h = 6.626 070 15 × 10⁻³⁴ J·s), eliminating the need for a physical artifact.
Interesting fact: The IPK and its official copies drifted apart by up to 50 micrograms over 130 years, motivating the 2019 redefinition. The kilogram is the only SI unit whose name starts with a prefix.