Amps to Milliamps Converter
Convert amperes (A) to milliamperes (mA) as you type — 1 A = 1,000 mA. Switch units, change the precision or copy the result.
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How to use this tool
Steps for using the Unit Converter.
- Enter a value in From — amperes are already selected.
- The result in milliamperes appears instantly. Change either unit to convert to anything else in current.
- Use the swap button for the reverse conversion, and set the decimal places you need.
- Turn on Show formula to see the calculation, then copy or share the result.
Example
1 A to mA
1 AmA = 1 × 1000 = 1,000 mACommon use cases
- LED and microcontroller currents in mA.
- Battery life estimates.
- Fuse and cable ratings in A.
Amps to Milliamps conversion table
| Ampere (A) | Milliampere (mA) |
|---|---|
| 0.1 A | 100 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 |
| 10 A | 10,000 mA |
| 15 A | 15,000 mA |
| Ampere (A) | Milliampere (mA) |
|---|---|
| 20 A | 20,000 mA |
| 25 A | 25,000 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 |
Values rounded to 6 decimal places.
Related conversions
The units
- Ampere (A)
- SI base unit of electric current. Part of the SI system.
- Milliampere (mA)
- 1/1000 A. Part of the Metric system.
How to convert amperes to milliamperes
Microcontroller pins, LEDs and USB ports are rated in milliamps; an LED typically draws about 20 mA.
To convert amperes to milliamperes, use mA = A × 1000. One ampere equals 1,000 milliamperes, and one milliampere equals 0.001 amperes.
Ampere (A): SI base unit of electric current. Milliampere (mA): 1/1000 A.
For the opposite direction, use the Milliamps to amps converter. All electric current units are on the current converter.
Limitations
- Results are rounded to the decimal places you choose; the calculation itself keeps full precision.
Frequently asked questions
How many milliamperes are in a ampere?
1 A = 1,000 mA. Multiply amperes by 1000 (or use mA = A × 1000).
How do I convert amperes to milliamperes?
Use mA = A × 1000. For example, 1 A = 1,000 mA and 10 A = 10,000 mA.
How many milliamps are in an amp?
1,000 mA.
How do I estimate battery life from mA?
Divide capacity in mAh by current in mA: a 2,000 mAh battery at 100 mA lasts about 20 hours (in practice less).