Convert Amperes to Milliamperes

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

Results in Milliamperes:
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1 A = 1,000 mA

How to Convert Amperes to Milliamperes

conversion scale showing amperes and equivalent milliamperes electric current values

To convert a ampere measurement to a milliampere measurement, multiply the electric current by the conversion ratio. One ampere is equal to 1,000 milliamperes, so use this simple formula to convert:

milliamperes = amperes × 1,000

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

For example, here's how to convert 5 amperes to milliamperes using the formula above.
5 A = (5 × 1,000) = 5,000 mA

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


The ampere, commonly referred to as just "amp," is the electrical current constant equal to the flow of one coulomb per second. According to an SI brochure, the ampere is a constant current that when passsed 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.

The ampere is the SI base unit for electric current in the metric system. A 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.

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.


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


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 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.

Ampere Measurements and Equivalent Milliampere Conversions

Common ampere values converted to the equivalent milliampere value
Amperes Milliamperes
1 A 1,000 mA
2 A 2,000 mA
3 A 3,000 mA
4 A 4,000 mA
5 A 5,000 mA
6 A 6,000 mA
7 A 7,000 mA
8 A 8,000 mA
9 A 9,000 mA
10 A 10,000 mA
11 A 11,000 mA
12 A 12,000 mA
13 A 13,000 mA
14 A 14,000 mA
15 A 15,000 mA
16 A 16,000 mA
17 A 17,000 mA
18 A 18,000 mA
19 A 19,000 mA
20 A 20,000 mA
21 A 21,000 mA
22 A 22,000 mA
23 A 23,000 mA
24 A 24,000 mA
25 A 25,000 mA
26 A 26,000 mA
27 A 27,000 mA
28 A 28,000 mA
29 A 29,000 mA
30 A 30,000 mA
31 A 31,000 mA
32 A 32,000 mA
33 A 33,000 mA
34 A 34,000 mA
35 A 35,000 mA
36 A 36,000 mA
37 A 37,000 mA
38 A 38,000 mA
39 A 39,000 mA
40 A 40,000 mA

More Ampere Electric Current Conversions

SI Units
Convert to Kiloamperes
1 A is equal to 0.001 kiloamperes
Convert to Megaamperes
1 A is equal to 1.0E-6 megaamperes
Centimetre–Gram–Second Units
Convert to Biots
1 A is equal to 0.1 biots
Convert to Abamperes
1 A is equal to 0.1 abamperes
Convert to Statamperes
1 A is equal to 299,792,453.7 statamperes
Other Units
Convert to Coulombs Per Second
1 A is equal to 1 coulombs per second