How many ampere in 1 milliampere?
The answer is 0.001.

We assume you are converting between **ampere** and **milliampere**.

You can view more details on each measurement unit:

ampere or
milliampere

The SI base unit for **electric current** is the ampere.

1 ampere is equal to 1 ampere, or 1000 milliampere.

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

Use this page to learn how to convert between amperes and milliamperes.

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

In physics, the ampere (symbol: A, often informally abbreviated to amp) is the SI base unit used to measure electrical currents. The present definition, adopted by the 9th CGPM in 1948 is: "one ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed one metre apart in vacuum, would produce between these conductors a force equal to 2 × 10^{-7} newton per metre of length".

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

So 1 milliampere = 10^{-3} ampere.

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