Coulombs to Milliampere-hours Converter
Enter the electric charge in coulombs below to convert it to milliampere-hours.
Convert Coulombs to Milliampere-hours
Enter a value in coulombs (C) to convert to milliampere-hours (mAh).
Coulomb to Milliampere-hour Conversion Table
Table showing various coulomb measurements converted to milliampere-hours. Click any preset value or arrow to load it into the converter.
| Coulombs (C) | Milliampere-hours (mAh) |
|---|---|
| 1 C | 0.2777778 mAh |
| 2 C | 0.5555556 mAh |
| 2.5 C | 0.6944444 mAh |
| 5 C | 1.3888889 mAh |
| 10 C | 2.7777778 mAh |
| 15 C | 4.1666667 mAh |
| 20 C | 5.5555556 mAh |
| 25 C | 6.9444444 mAh |
| 30 C | 8.3333333 mAh |
| 50 C | 13.8888889 mAh |
How to Convert Coulombs to Milliampere-hours
To convert coulombs to milliampere-hours, multiply the electric charge by the following conversion ratio: 0.2777778 milliampere-hours/coulomb.
Since one coulomb is equal to 0.2777778 milliampere-hours, you can use this simple formula to convert:
The electric charge in milliampere-hours is equal to the electric charge in coulombs multiplied by 0.2777778.
For example, here's how to convert 5 coulombs to milliampere-hours using the formula above.
How Many Milliampere-hours Are in a Coulomb?
There are 0.2777778 milliampere-hours in a coulomb, which is why we use this value in the formula above.
Our coulomb to milliampere-hour calculator automatically converts your electric charge measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Coulombs and milliampere-hours are both units used to measure electric charge. Keep reading to learn more about each unit.
What Is a Coulomb?
SI unit of electric charge (1 A·s). It serves as a primary reference unit for measuring electric charge across scientific and practical applications. [1]
The coulomb is classified as an International System of Units (SI) unit of electric charge. Coulombs can be abbreviated as C; for example, 1 coulomb can be written as 1 C.
As the primary coherent reference unit for electric charge in this category, all other electric charge units are mathematically anchored to the coulomb (C).
In practice, coulombs (C) are widely used across standard electric charge applications within International System of Units (SI) 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 coulombs (C) and milliampere-hours (mAh), keep full floating-point precision (1 C = 0.2777778 mAh; 1 mAh = 3.6 C) during intermediate calculations and round only the final milliampere-hour figure to match your instrument tolerance.
More Coulomb & Milliampere-hour Conversions
Need to calculate in the opposite direction? Use our milliampere-hours to coulombs converter (mAh to C) to switch your starting unit immediately. You can also explore related tools such as converting ampere-hours to milliampere-hours, converting microcoulombs to coulombs, or converting nanocoulombs to coulombs.
Convert from Coulombs
Frequently Asked Questions
References
- [1]NIST CUU StandardNIST CUU (Derived SI Unit: Coulomb (C))·Electric Charge Metrology Standard — Coulombs (C) to Milliampere-hours (mAh)
- [2]NIST OWM SpecificationNIST OWM (SI Units — Electric Current)·Unit Specifications: Coulomb (C) & 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 (C to mAh)