The ampere (A) is the SI unit of electric current, measuring the rate of flow of electric charge.
Amperes to Milliamperes
Convert Ampere (A) to Milliampere (mA) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Electrical calculator
Electricity Converter
Convert amperes (A) to milliamperes (mA) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A milliampere (mA) equals one-thousandth of an ampere and is the everyday scale for small electronics and batteries.
mA = A × 1000
Results update instantly for Amperes to Milliamperes conversions.
Reserved above the conversion cards and below the converter.
Formula
mA = A × 1000
A = mA × 0.001
Conversion table
| 1 A | 1000 mA |
| 5 A | 5000 mA |
| 10 A | 10000 mA |
| 20 A | 20000 mA |
| 50 A | 50000 mA |
| 100 A | 100000 mA |
| 500 A | 500000 mA |
| 1000 A | 1.000000e+06 mA |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both ampere and milliampere measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in amperes by 1000 to get milliamperes. To reverse the conversion, multiply a milliampere value by 0.001 to get back to amperes.
Frequently asked questions
What is Ampere (A)?
The ampere (A) is the SI unit of electric current, measuring the rate of flow of electric charge.
What is Milliampere (mA)?
A milliampere (mA) equals one-thousandth of an ampere and is the everyday scale for small electronics and batteries.
How do I convert amperes to milliamperes?
Multiply the ampere value by 1000 to get the equivalent in milliamperes. For example, 5 A × 1000 = 5000 mA.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1000 is an exact, non-rounded value.
Can I convert milliamperes back to amperes?
Yes. Divide the milliampere value by 1000, or multiply it by 0.001, to get amperes.
Reserved between the FAQ and the article so the page stays balanced.
About converting amperes to milliamperes
The ampere (A) is the SI unit of electric current, measuring the rate of flow of electric charge. A milliampere (mA) equals one-thousandth of an ampere and is the everyday scale for small electronics and batteries.
Use this calculator to move between amperes and milliamperes accurately for homework, engineering, billing, or everyday electricity calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.