Amperes to Milliamperes Converter

Enter the electric current in amperes below to get the value converted to milliamperes.


Result in Milliamperes:

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1 A = 1,000 mA

Do you want to convert milliamperes to amperes?

How to Convert Amperes to Milliamperes

To convert a measurement in amperes to a measurement in milliamperes, multiply the electric current by the following conversion ratio: 1,000 milliamperes/ampere.

Since one ampere is equal to 1,000 milliamperes, you can use this simple formula to convert:

milliamperes = amperes × 1,000

The electric current in milliamperes is equal to the electric current in amperes multiplied by 1,000.

For example, here's how to convert 5 amperes to milliamperes using the formula above.
milliamperes = (5 A × 1,000) = 5,000 mA
conversion scale showing amperes and equivalent milliamperes electric current values

How Many Milliamperes Are in an Ampere?

There are 1,000 milliamperes in an ampere, which is why we use this value in the formula above.

1 A = 1,000 mA

Amperes and milliamperes are both units used to measure electric current. Keep reading to learn more about each unit of measure.

What Is an Ampere?

The ampere, commonly referred to as an "amp," is the electrical current constant equal to the flow of one coulomb per second.

The ampere was previously defined as a constant current that when passed through two straight and parallel conductors that are spaced one meter apart, will produce a force equal to 0.0000002 newtons per meter of length.

In 2019, the ampere was redefined as the electric current corresponding to the flow of 1/(1.602 176 634 × 10-19) elementary charges per second.[1]

The ampere is the SI base unit for electric current in the metric system. An ampere is sometimes also referred to as an amp. Amperes can be abbreviated as A; for example, 1 ampere can be written as 1 A.

Amperage and Ohm's Law

Ohm's Law states the current between two points on a conductor is proportional to the voltage and inversely proportional to the resistance. Using Ohm's Law, it's possible to express the current in amperes as an expression using resistance and voltage.

IA = VV / R

The current in amperes is equal to the potential difference in volts divided by the resistance in ohms.

Learn more about amperes.

What Is a Milliampere?

One milliampere is equal to 1/1,000 of an ampere, which is the electrical current equal to the flow of one coulomb per second.

The milliampere is a multiple of the ampere, which is the SI base unit for electric current. In the metric system, "milli" is the prefix for thousandths, or 10-3. A milliampere is sometimes also referred to as a milliamp. Milliamperes can be abbreviated as mA; for example, 1 milliampere can be written as 1 mA.

Learn more about milliamperes.

Ampere to Milliampere Conversion Table

Table showing various ampere measurements converted to milliamperes.
Amperes Milliamperes
0.001 A 1 mA
0.002 A 2 mA
0.003 A 3 mA
0.004 A 4 mA
0.005 A 5 mA
0.006 A 6 mA
0.007 A 7 mA
0.008 A 8 mA
0.009 A 9 mA
0.01 A 10 mA
0.02 A 20 mA
0.03 A 30 mA
0.04 A 40 mA
0.05 A 50 mA
0.06 A 60 mA
0.07 A 70 mA
0.08 A 80 mA
0.09 A 90 mA
0.1 A 100 mA
0.2 A 200 mA
0.3 A 300 mA
0.4 A 400 mA
0.5 A 500 mA
0.6 A 600 mA
0.7 A 700 mA
0.8 A 800 mA
0.9 A 900 mA
1 A 1,000 mA


  1. International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019,

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