Convert Micrograms to Kilograms
Convert Micrograms to Kilograms instantly. 1 Microgram (µg) equals 0.000000001 Kilograms (kg).
Micrograms to Kilograms conversion table
| Micrograms (µg) | Kilograms (kg) |
|---|---|
| 1 µg | 0.000000001 kg |
| 2 µg | 0.000000002 kg |
| 3 µg | 0.000000003 kg |
| 5 µg | 0.000000005 kg |
| 10 µg | 0.00000001 kg |
| 20 µg | 0.00000002 kg |
| 50 µg | 0.00000005 kg |
| 100 µg | 0.0000001 kg |
| 500 µg | 0.0000005 kg |
| 1,000 µg | 0.000001 kg |
1 Microgram = 0.000000001 Kilograms · multiply Micrograms by 0.000000001
About converting Micrograms to Kilograms
Micrograms (µg) and Kilograms (kg) are both units of weight & mass, so converting between them is a single multiplication: multiply your Micrograms figure by 0.000000001. Ten Micrograms comes to 0.00000001 Kilograms, and a hundred works out at 0.0000001 Kilograms.
Rule of thumb: going from Micrograms to Kilograms divides, so the figure always shrinks — it takes about 1,000,000,000 Micrograms to make a single Kilogram. If your answer came out bigger, you have the conversion the wrong way round.
What is a Microgram?
A microgram is one millionth of a gram, and in medicine it is a genuinely dangerous unit. Several important drugs — levothyroxine for the thyroid, fentanyl, digoxin — are dosed in micrograms while others are dosed in milligrams, and a prescription misread across that thousandfold gap is a well-documented category of medication error. Because a handwritten Greek µ can be mistaken for an m, hospital safety guidance often requires the abbreviation to be spelled out as "mcg" instead. Outside the clinic, micrograms measure vitamins and airborne pollutants.
What is a Kilogram?
The kilogram was the last SI unit still defined by a physical object — the International Prototype Kilogram, a platinum-iridium cylinder kept in a vault near Paris since 1889. The problem was that it drifted. Careful comparisons against its official copies showed the masses diverging by tens of micrograms, and because the prototype simply was the kilogram by definition, there was no way to say which side had changed. In 2019 it was redefined in terms of the Planck constant, so any properly equipped lab can now realise a kilogram from physics rather than from an artefact.
To put both in perspective: a single grain of table salt weighs a few dozen micrograms, while a liter of water weighs about a kilogram.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Kilograms to Micrograms converter, or browse all Weight & Mass converters.
Frequently asked questions
How many Kilograms are in one Microgram?
There are 0.000000001 Kilograms in one Microgram.
How do I convert Micrograms to Kilograms?
Multiply the number of Micrograms by 0.000000001. For example, 10 Micrograms = 0.00000001 Kilograms.
What is 100 Micrograms in Kilograms?
100 Micrograms is equal to 0.0000001 Kilograms.
How do I convert Kilograms to Micrograms?
Multiply the Kilograms value by 1,000,000,000 (or divide by 0.000000001).
Is this Micrograms to Kilograms conversion exact?
The definition is exact — Micrograms and Kilograms are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is a Microgram?
A microgram is one millionth of a gram, and in medicine it is a genuinely dangerous unit. Several important drugs — levothyroxine for the thyroid, fentanyl, digoxin — are dosed in micrograms while others are dosed in milligrams, and a prescription misread across that thousandfold gap is a well-documented category of medication error. Because a handwritten Greek µ can be mistaken for an m, hospital safety guidance often requires the abbreviation to be spelled out as "mcg" instead. Outside the clinic, micrograms measure vitamins and airborne pollutants.
What is a Kilogram?
The kilogram was the last SI unit still defined by a physical object — the International Prototype Kilogram, a platinum-iridium cylinder kept in a vault near Paris since 1889. The problem was that it drifted. Careful comparisons against its official copies showed the masses diverging by tens of micrograms, and because the prototype simply was the kilogram by definition, there was no way to say which side had changed. In 2019 it was redefined in terms of the Planck constant, so any properly equipped lab can now realise a kilogram from physics rather than from an artefact.