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Ampere Converters

Convert amperes to milliamperes, microamperes, kiloamperes, megaamperes and other electric current units.

What this tool does

Convert amperes to milliamperes, microamperes, kiloamperes, megaamperes and other electric current units. Type an amount in amperes, choose the units, and the tool converts it to milliamperes. It offers 10 electric current units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 10 options, including Megaampere, Kiloampere, Ampere, Milliampere, Microampere, Nanoampere. Starts as Ampere.
  • To: Choose one of the same 10 units as "From". Starts as Milliampere.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from amperes to milliamperes:

  • 1 A = 1,000 mA
  • 5 A = 5,000 mA
  • 10 A = 10,000 mA
  • 50 A = 50,000 mA
  • 100 A = 100,000 mA

Multiply the number of amperes by 1,000 to get milliamperes. Both units are exact definitions, so 1,000 is the exact factor: 1 A = 1,000 mA.

Sources: Ampere: SI Brochure, 9th edition (2019). Milliampere: SI Brochure, 9th edition (2019, updated 2022), Table 7 (SI prefixes).

Limitations

  • Converts the unit of an electric current only. It does not work out current from power, voltage or resistance.
  • Abampere and statampere are historical CGS units, listed for completeness.

FAQs

Q: How many milliamperes are in one ampere?
A: One ampere is 1000 milliamperes, and one milliampere is 0.001 ampere.
Q: How many microamperes are in one ampere?
A: One ampere is 1,000,000 microamperes (one million).
Q: What are abamperes and statamperes?
A: They are the electromagnetic and electrostatic CGS units of current. One abampere is exactly 10 amperes. One statampere is about 3.3356 × 10⁻¹⁰ amperes.

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