How to convert amperes to milliamperes
mA = A × 1,000Multiply the value in amperes by 1,000. To go the other way, multiply by 0.001 (or divide by 1,000).
An ampere is larger than a milliampere: one ampere contains 1,000 milliamperes.
Worked examples
- 1 ampere1 A × 1,000 = 1,000 mA
- 5 amperes5 A × 1,000 = 5,000 mA
- 10 amperes10 A × 1,000 = 10,000 mA
- 20 amperes20 A × 1,000 = 20,000 mA
- 100 amperes100 A × 1,000 = 100,000 mA
Amperes to milliamperes conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Amperes (A) | Milliamperes (mA) |
|---|---|
| 0.1 A | 100 mA |
| 0.25 A | 250 mA |
| 0.5 A | 500 mA |
| 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 |
| Amperes (A) | Milliamperes (mA) |
|---|---|
| 12 A | 12,000 mA |
| 15 A | 15,000 mA |
| 20 A | 20,000 mA |
| 25 A | 25,000 mA |
| 30 A | 30,000 mA |
| 40 A | 40,000 mA |
| 50 A | 50,000 mA |
| 75 A | 75,000 mA |
| 100 A | 100,000 mA |
| 250 A | 250,000 mA |
| 500 A | 500,000 mA |
| 1,000 A | 1,000,000 mA |
About the units
Ampere (A)
The SI base unit of current: 1/(1.602176634 × 10⁻¹⁹) elementary charges per second.
Milliampere (mA)
The milliampere (mA) is a unit of electric current in the International System of Units (SI). One milliampere equals 0.001 amperes (A).
Frequently asked questions
How many milliamperes are in one ampere?
There are 1,000 milliamperes in one ampere, and this value is exact by definition.
How do I convert amperes to milliamperes?
Multiply the number of amperes by 1,000. For example, 10 A × 1,000 = 10,000 mA.
How many amperes are in one milliampere?
One milliampere equals 0.001 amperes. That is the reverse factor, 1 ÷ 1,000.
What is 10 amperes in milliamperes?
10 A = 10,000 mA.
Is this A to mA converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.