Milliamperes to Amperes Converter
Enter the electric current in milliamperes below to convert it to amperes.
Convert Milliamperes to Amperes
Enter a value in milliamperes (mA) to convert to amperes (A).
Milliampere to Ampere Conversion Table
Table showing various milliampere measurements converted to amperes. Click any preset value or arrow to load it into the converter.
How to Convert Milliamperes to Amperes
To convert milliamperes to amperes, multiply the electric current by the following conversion ratio: 0.001 amperes/milliampere.
Since one milliampere is equal to 0.001 amperes, you can use this simple formula to convert:
The electric current in amperes is equal to the electric current in milliamperes multiplied by 0.001.
For example, here's how to convert 500 milliamperes to amperes using the formula above.
How Many Amperes Are in a Milliampere?
There are 0.001 amperes in a milliampere, which is why we use this value in the formula above.
Our milliampere to ampere calculator automatically converts your electric current measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milliamperes and amperes are both units used to measure electric current. Keep reading to learn more about each unit.
What Is a Milliampere?
A milliampere is a unit of electric current equal to 1/1,000 of an ampere (0.001 A). One-thousandth of an Ampere (0.001 A). [1]
The milliampere is classified as a metric and SI-compatible unit of electric current. Milliamperes can be abbreviated as mA; for example, 1 milliampere can be written as 1 mA.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milliampere (mA) a convenient decimal multiple of the ampere (A).
In practice, milliamperes (mA) are widely used across fine-tolerance laboratory, analytical, and micro-scale electric current measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is an Ampere?
Base SI unit of electric current. It serves as a primary reference unit for measuring electric current across scientific and practical applications. [2]
The ampere is classified as an International System of Units (SI) unit of electric current. Amperes can be abbreviated as A; for example, 1 ampere can be written as 1 A.
As the primary coherent reference unit for electric current in this category, all other electric current units are mathematically anchored to the ampere (A).
In practice, amperes (A) are widely used across standard electric current applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting electric current between milliamperes (mA) and amperes (A), keep full floating-point precision (1 mA = 0.001 A; 1 A = 1,000 mA) during intermediate calculations and round only the final ampere figure to match your instrument tolerance.
More Milliampere & Ampere Conversions
Need to calculate in the opposite direction? Use our amperes to milliamperes converter (A to mA) to switch your starting unit immediately. You can also explore related tools such as converting kiloamperes to amperes, or converting microamperes to milliamperes.
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Electric Current)·Electric Current Metrology Standard — Milliamperes (mA) to Amperes (A)
- [2]BIPM SpecificationBIPM (SI Base Unit: Ampere (A))·Unit Specifications: Milliampere (mA) & Ampere (A)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9 (Electricity & Magnetism))·Conversion Factors & Mathematical Basis (mA to A)