Electrical
AtomA
Convert amperes (A) to milliamperes (mA).
Factor1 A = 1000 mA
Converter
A
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mA
Rendered to 6 significant figures.
Formula
Formula
mA = A × 1000
Multiply any value in amperes by 1000 to obtain the value in milliamperes.
Worked example
Convert 1 A to mA.
- 01Start with 1 A.
- 02Multiply by the conversion factor: 1 × 1000 = 1000 mA.
Result1 A = 1000 mA
Conversion table
| A | mA |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 50 | 50000 |
| 100 | 1.0000e+5 |
| 200 | 2.0000e+5 |
| 500 | 5.0000e+5 |
| 1000 | 1.0000e+6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from A to mA?
1 A equals 1000 mA. To convert, multiply the value in amperes by 1000.
How do I convert 1 A to mA?
1 A = 1000 mA. For any value, multiply by 1000.
How do I convert mA back to A?
Divide by the same factor — or equivalently, multiply by 0.001. So 1 mA = 0.001 A.
When would I need to convert ampere to milliampere?
Current conversions between A and mA appear in motor and cable sizing, instrumentation loop design (4–20 mA), battery characterisation and electronics. Amperes are standard for power circuits; milliamperes and microamperes are the working units for signal conditioning and sensor outputs.
Is the conversion exact?
Yes. Both A and mA are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).