Electric Current Converter
Convert between ampere, milliamp, microamp, and kiloamp instantly.
Enter any value and the others auto-update.
Includes a current unit quick-reference table.
Type in any field and the others update instantly.
Electric current measures the flow of electric charge past a point, counted in amperes (A). One ampere is one coulomb of charge per second, roughly 6.24 billion billion electrons streaming by. The ampere is one of the seven SI base units, so every other electrical unit is built on top of it. All conversions here use the ampere as the base.
Metric prefixes:
- 1 A = 1,000 mA (milliamps)
- 1 A = 1,000,000 µA (microamps)
- 1 kA = 1,000 A (kiloamps)
Most of the time you’re converting because a datasheet, a fuse rating, or a power-supply spec uses a different prefix than the one you’re working in. Small electronics live in the milliamp and microamp world; household and industrial wiring lives in amps and kiloamps.
Quick reference: what draws what
| Current | In amps | What it is |
|---|---|---|
| 1 µA | 0.000001 A | leakage through a good capacitor |
| 1 mA | 0.001 A | the threshold where you can feel it |
| 10 mA | 0.01 A | muscles lock up, you cannot let go |
| 20 mA | 0.02 A | a single indicator LED |
| 100 mA | 0.1 A | potentially fatal across the chest |
| 500 mA | 0.5 A | a common small fuse rating |
| 2 A | 2 A | a fast phone charger |
| 13 A | 13 A | a hair dryer or a UK plug fuse |
| 20 A | 20 A | a household circuit breaker |
| 150 A | 150 A | a car starter motor, briefly |
| 20 kA | 20,000 A | a lightning stroke, for microseconds |
Where people slip is mixing mA and A by a factor of 1,000. A 500 mA fuse is half an amp, not 500 amps, and a misplaced decimal means either a blown part or a fuse that never trips.
Current is also the part of electricity that actually hurts you. As little as 10 mA across the body can lock up muscles, and 100 mA can be fatal. Voltage gets the fear, but current does the damage. Those two thresholds are why the panel below flags any value in that range: the numbers are small enough that a decimal slip lands you there without noticing.
How we build and check this converter
This converter runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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