Current Converter

Convert µA, mA, A and kA for circuit design, battery runtimes, fuses and power supplies.

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Enter a Value

Type a number and choose the units to convert between

Fromamperes

Tomilliamperes

1,000

Choose a Category

27 kinds of units — each opens its own converter

Current Result

The converted value updates as you type — copy, share or save it

Convert amperes to3 units

Result

From

ampere (A)

1,000

milliamperes (mA)

1 A = 1,000 mA1 mA = 0.001 A

Decimal places

Show formula

mA = A × 1000

Results are rounded to the decimal places you choose for display only; the calculation keeps full precision.

Amps to milliamps page Milliamps to amps converter

Common current conversions

Recent conversions

Conversions you save, copy as a link or share appear here. They’re stored only in this browser.

1 A in every current unit

Quick convertPopular conversions with one click

How to use this tool

Type a number into From — amperes are preselected. Commas and scientific notation such as 2.5e3 are accepted.
Pick the units to convert between; the result in milliamperes (or whichever unit you choose) updates as you type. Use the swap button to reverse the conversion.
Set the decimal places, turn on Show formula to see the calculation, and copy or share the result.
Below the converter, the table lists every electric current unit with its exact definition, and the links open dedicated pages for the most common pairs.

Example

0.5 amperes to milliamperes

Value

0.5 A

Result

500 mA

Formula: mA = A × 1000

Common use cases

LED and microcontroller currents in mA.
Battery life estimates.
Fuse and cable ratings in A.

Current unit table

Current units with their symbols and definitions
Unit	Symbol	System	Definition	In amperes
Microampere	µA	Metric	10⁻⁶ A	0.000001
Milliampere	mA	Metric	1/1000 A	0.001
Ampere	A	SI	SI base unit of electric current	1
Kiloampere	kA	Metric	1,000 A	1,000

Popular current conversions

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About electric current units

The ampere is the SI base unit of electric current — one coulomb of charge per second. Small electronic currents are measured in milliamps (1/1,000 A) and microamps (1/1,000,000 A).

Datasheets often mix units: a microcontroller might draw 15 mA running and 2 µA asleep, while its USB supply is rated 0.5 A.

Limitations

Results are rounded for display only; the calculation keeps full precision (15 significant digits).

Frequently asked questions

How many milliamps are in an amp?

1,000 mA.

How do I estimate battery life from mA?

Divide capacity in mAh by current in mA: a 2,000 mAh battery at 100 mA lasts about 20 hours (in practice less).

Is amp the same as ampere?

Yes, “amp” is the everyday short form.

Are these electric current conversions exact?

Each unit is defined from its official definition (for example 1 inch = 2.54 cm exactly). Results are calculated in double precision and only rounded to the decimal places you choose when shown.