Ampere-hours to Milliampere-hours Converter
Enter the electric charge in ampere-hours below to convert it to milliampere-hours.
Convert Ampere-hours to Milliampere-hours
Enter a value in ampere-hours (Ah) to convert to milliampere-hours (mAh).
Ampere-hour to Milliampere-hour Conversion Table
Table showing various ampere-hour measurements converted to milliampere-hours. Click any preset value or arrow to load it into the converter.
| Ampere-hours (Ah) | Milliampere-hours (mAh) |
|---|---|
| 1 Ah | 1,000 mAh |
| 2 Ah | 2,000 mAh |
| 5 Ah | 5,000 mAh |
| 10 Ah | 10,000 mAh |
| 15 Ah | 15,000 mAh |
| 20 Ah | 20,000 mAh |
| 25 Ah | 25,000 mAh |
| 30 Ah | 30,000 mAh |
| 40 Ah | 40,000 mAh |
| 50 Ah | 50,000 mAh |
How to Convert Ampere-hours to Milliampere-hours
To convert ampere-hours to milliampere-hours, multiply the electric charge by the following conversion ratio: 1,000 milliampere-hours/ampere-hour.
Since one ampere-hour is equal to 1,000 milliampere-hours, you can use this simple formula to convert:
The electric charge in milliampere-hours is equal to the electric charge in ampere-hours multiplied by 1,000.
For example, here's how to convert 20 ampere-hours to milliampere-hours using the formula above.
How Many Milliampere-hours Are in an Ampere-hour?
There are 1,000 milliampere-hours in an ampere-hour, which is why we use this value in the formula above.
Our ampere-hour to milliampere-hour calculator automatically converts your electric charge measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Ampere-hours and milliampere-hours are both units used to measure electric charge. Keep reading to learn more about each unit.
What Is an Ampere-hour?
An ampere-hour is a unit of electric charge equal to 3,600 coulombs (C), the base unit for electric charge. Battery charge capacity unit equal to 3,600 Coulombs (1,000 mAh). [1]
The ampere-hour is classified as a standard unit of electric charge. Ampere-hours can be abbreviated as Ah; for example, 1 ampere-hour can be written as 1 Ah.
When working with ampere-hours (Ah) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, ampere-hours (Ah) are widely used across large-scale industrial, bulk, and macro-level electric charge specifications within international standard workflows, engineering documentation, and technical data sheets.
What Is a Milliampere-hour?
A milliampere-hour is a unit of electric charge equal to 3.6 coulombs (C), the base unit for electric charge. Battery capacity unit equal to 0.001 Ah or 3.6 Coulombs. [2]
The milliampere-hour is classified as a standard unit of electric charge. Milliampere-hours can be abbreviated as mAh; for example, 1 milliampere-hour can be written as 1 mAh.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milliampere-hour (mAh) a convenient decimal multiple of the coulomb (C).
In practice, milliampere-hours (mAh) are widely used across standard electric charge applications within international standard workflows, engineering documentation, and technical data sheets.
When converting electric charge between ampere-hours (Ah) and milliampere-hours (mAh), keep full floating-point precision (1 Ah = 1,000 mAh; 1 mAh = 0.001 Ah) during intermediate calculations and round only the final milliampere-hour figure to match your instrument tolerance.
More Ampere-hour & Milliampere-hour Conversions
Need to calculate in the opposite direction? Use our milliampere-hours to ampere-hours converter (mAh to Ah) to switch your starting unit immediately. You can also explore related tools such as converting ampere-hours to kilowatt-hours, converting ampere-hours to watt-hours, or converting microcoulombs to coulombs.
Convert from Ampere-hours
Frequently Asked Questions
References
- [1]NIST CUU StandardNIST CUU (Derived SI Unit: Coulomb (C))·Electric Charge Metrology Standard — Ampere-hours (Ah) to Milliampere-hours (mAh)
- [2]NIST OWM SpecificationNIST OWM (SI Units — Electric Current)·Unit Specifications: Ampere-hour (Ah) & Milliampere-hour (mAh)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9 (1 Ah = 3,600 C))·Conversion Factors & Mathematical Basis (Ah to mAh)