Convert amperes to milliamperes and milliamperes to amperes instantly. Bidirectional current converter with formula and common values.
To convert amperes to milliamperes, multiply by 1,000. The milliampere is the standard unit for measuring small currents in electronic circuits and devices.
| Amperes (A) | Milliamperes (mA) |
|---|---|
| 0.001 | 1 |
| 0.02 | 20 |
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1,000 |
| 3.7 | 3,700 |
| 15 | 15,000 |
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One ampere equals exactly 1,000 milliamperes (mA). The milli- prefix represents one-thousandth.
Milliamperes are used for LED forward currents (typically 5-20 mA), microcontroller pin currents, sensor power consumption, and battery drain measurements in portable devices.
Multiply the ampere value by 1,000. For example, 3.7 A × 1,000 = 3,700 mA.
Currents as low as 1 mA can be felt, 10-20 mA causes involuntary muscle contraction, and currents above 75-100 mA through the heart can be fatal.
Milliampere-hours measure battery capacity. A 2,000 mAh battery can theoretically deliver 2,000 mA for one hour, or 500 mA for four hours.