Convert Milliamperes to Amperes
Convert Milliamperes (mA) to Amperes (A) instantly and accurately.
Conversion Formula
A = mA × 0.001
About Milliamperes
The milliampere (mA) equals 10⁻³ A, the everyday unit in consumer electronics and safety standards. Standard LEDs operate at 5-30 mA; USB 2.0 ports supply up to 500 mA; USB-C fast-charging delivers 3 000-5 000 mA. The milliampere is also the clinically important range for electric shock - ventricular fibrillation threshold is around 100 mA, and 1 mA is the threshold of perception. 1 mA = 10⁻³ A = 10³ µA.
About Amperes
The ampere (A) is the SI base unit of electric current, defined since 2019 by fixing the elementary charge e = 1.602 176 634 × 10⁻¹⁹ C. One ampere corresponds to approximately 6.241 × 10¹⁸ electrons passing a cross-section per second. Common benchmarks: a 60 W incandescent lamp draws 0.5 A at 120 V; household circuit breakers protect at 10-30 A; a car starter motor draws 100-200 A on cranking.
Quick Reference Table
| Milliamperes (mA) | Amperes (A) |
|---|---|
| 1 mA | 0.001 A |
| 2 mA | 0.002 A |
| 5 mA | 0.005 A |
| 10 mA | 0.01 A |
| 25 mA | 0.025 A |
| 50 mA | 0.05 A |
| 100 mA | 0.1 A |