Convert between amperes, milliamperes, kiloamperes, and microamperes.
Enter a value and click Convert to see all conversions.
An ampere (amp) is the base unit of electric current. One ampere represents one coulomb of charge passing a point per second.
1 ampere = 1000 milliamperes. Conversely, 1 milliampere = 0.001 amperes.
Milliamperes (mA) are used to measure small currents in electronics, LEDs, sensors, and medical devices. Most smartphone chargers output 1000-3000 mA.
Divide amperes by 1000 to get kiloamperes. For example, 5000 A = 5 kA.
Microamperes (µA) measure extremely small currents in biomedical sensors, CMOS circuits, and standby power consumption of electronic devices.
Use Ohm's Law: I = P/V. For a 100 W device at 120 V, current = 100/120 = 0.833 A or 833 mA.
Standard household circuits in the US are rated for 15 or 20 amperes at 120 V. In Europe, circuits typically handle 16 A at 230 V.