Amperes to milliamperes
Type a value in amperes to see it in milliamperes straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the amperes box.
- Read the result in milliamperes as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
mA = A × 1,000
Multiply the value in amperes by 1,000 to get milliamperes.
Example
To convert 25 A to milliamperes: 25 × 1,000 = 25,000 mA.
Conversion table
| Amperes (A) | Milliamperes (mA) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
About the units
- Ampere
- The SI base unit of current, equal to one coulomb of charge passing per second. Since 2019 it is defined by fixing the elementary charge at 1.602176634 × 10^-19 C.
- Milliampere
- A milliampere is exactly one thousandth of an ampere, used for small electronics, sensors and device charging currents.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many milliamperes are in one ampere?
1 A = 1,000 mA exactly.
How do I convert amperes to milliamperes?
Use mA = A × 1,000. For example, 25 A = 25,000 mA.
How many amperes are in one milliampere?
1 mA = 0.001 A.
How many milliamperes are in one ampere?
One ampere is exactly 1000 milliamperes, so a charger rated 2 A delivers up to 2000 mA.
Can I convert amps to watts?
Not directly, because power in watts is current times voltage. A current of 2 A at 5 V gives 10 W.