How many mg in 1 mcg? The answer is 0.001.

We assume you are converting between **milligram** and **microgram**.

You can view more details on each measurement unit:

mg or mcg

The SI base unit for **mass** is the kilogram.

1 kilogram is equal to 1000000 mg, or mcg.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between milligrams and micrograms.

Type in your own numbers in the form to convert the units!

The SI prefix "milli" represents a factor of 10-3, or in exponential notation, 1E-3.

So 1 milligram = 10-3 grams-force.

The SI prefix "micro" represents a factor of 10-6, or in exponential notation, 1E-6.

So 1 microgram = 10-6 grams-force.

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