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.

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You can do the reverse unit conversion from milliampere to ampere, or enter any two units below:

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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