Convert Coulomb to Milliampere-hour
Use this free converter to change coulombs (C) into milliampere-hours (mAh). Coulomb and milliampere-hour both measure electric charge. As a quick reference, 1 C equals 0.27777778 mAh, and 1 mAh equals 3.6 C.
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Milliampere-hour (mAh)
0.27777778
1 C = 0.27777778 mAh
Electric Charge conversion table
| Coulomb | Milliampere-hour |
|---|---|
| 0.01 | 0.0027777778 |
| 0.1 | 0.027777778 |
| 0.5 | 0.13888889 |
| 1 | 0.27777778 |
| 2 | 0.55555556 |
| 3 | 0.83333333 |
| 5 | 1.3888889 |
| 10 | 2.7777778 |
| 20 | 5.5555556 |
| 25 | 6.9444444 |
| 50 | 13.888889 |
| 100 | 27.777778 |
| 1,000 | 277.77778 |
How to convert Coulomb to Milliampere-hour
Multiply the coulomb value by 0.27777778 to get milliampere-hours.
- Enter the number of coulombs you want to convert.
- The converter instantly shows the equivalent value in milliampere-hours.
- Worked example: 15 C × 0.27777778 = 4.1666667 mAh.
- Use the swap button to reverse the conversion (milliampere-hour to coulomb).
About these units
Coulomb (C)
- Definition
- The coulomb (C) is the SI unit of electric charge, defined as the charge transported by one ampere of current in one second.
- History
- Named after French physicist Charles-Augustin de Coulomb, it was formalised with the SI system and redefined in 2019 in terms of the elementary charge.
- Current use
- Coulombs are used in electrochemistry, capacitor ratings, and electrostatics calculations.
Milliampere-hour (mAh)
- Definition
- A milliampere-hour (mAh) is one thousandth of an ampere-hour, equal to 3.6 coulombs.
- History
- It became the standard consumer electronics capacity unit as portable devices shrank.
- Current use
- Battery capacity of smartphones, earbuds, and wearables is universally quoted in mAh.
Frequently asked questions
How many milliampere-hours are in a coulomb?
There are 0.27777778 mAh in 1 C. To convert, multiply the number of coulombs by 0.27777778.
How do I convert coulombs to milliampere-hours?
Multiply the coulomb value by 0.27777778 to get milliampere-hours. For example, 10 C = 2.7777778 mAh.
Is this coulomb-to-milliampere-hour converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Coulomb to other electric charge units
| Unit | 1 Coulomb equals |
|---|---|
| Millicoulomb (mC) | 1000 mC |
| Microcoulomb (µC) | 1000000 µC |
| Nanocoulomb (nC) | 1000000000 nC |
| Ampere-hour (Ah) | 0.00027777778 Ah |
| Milliampere-hour (mAh) | 0.27777778 mAh |