Convert Amperes to Milliamperes
Convert Amperes (A) to Milliamperes (mA) instantly and accurately.
Conversion Formula
mA = A × 1000
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.
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.
Quick Reference Table
| Amperes (A) | Milliamperes (mA) |
|---|---|
| 1 A | 1000 mA |
| 2 A | 2000 mA |
| 5 A | 5000 mA |
| 10 A | 10000 mA |
| 25 A | 25000 mA |
| 50 A | 50000 mA |
| 100 A | 100000 mA |