Coulombs to Milliampere-hours Converter C → mAh
1 coulomb (C) = 0.2777777778 milliampere-hours (mAh). Type a value below — the conversion happens instantly, entirely on your device.
1 C = 0.2777777778 mAh
1 coulombs = 0.27777778 milliampere-hours
1 × 0.277778 = 0.27777778
1 C equals 0.277778 mAh, so multiplying by 0.277778 converts the value. The result describes the exact same quantity — only the measuring stick changes.
How to convert coulombs to milliampere-hours
milliampere-hours = coulombs × 0.2777777778 — multiply the coulomb value by 0.277778.
Example: 10 C = 2.77778 mAh.
To convert the other way: coulombs = milliampere-hours ÷ 0.2777777778 — or use the dedicated mAh to C converter .
Coulombs to Milliampere-hours conversion table
| Coulombs (C) | Milliampere-hours (mAh) |
|---|---|
| 0.1 | 0.027777778 |
| 0.25 | 0.069444444 |
| 0.5 | 0.13888889 |
| 1 | 0.27777778 |
| 2 | 0.55555556 |
| 3 | 0.83333333 |
| 4 | 1.1111111 |
| 5 | 1.3888889 |
| 6 | 1.6666667 |
| 7 | 1.9444444 |
| 8 | 2.2222222 |
| 9 | 2.5 |
| 10 | 2.7777778 |
| 15 | 4.1666667 |
| 20 | 5.5555556 |
| 25 | 6.9444444 |
| 30 | 8.3333333 |
| 40 | 11.111111 |
| 50 | 13.888889 |
| 75 | 20.833333 |
| 100 | 27.777778 |
| 250 | 69.444444 |
| 500 | 138.88889 |
| 1000 | 277.77778 |
About the units
What is a coulomb?
The SI unit of electric charge — the charge carried by a one-ampere current in one second. It equals about 6.24×10¹⁸ elementary charges.
What is a milliampere-hour?
One-thousandth of an ampere-hour (3.6 C). The standard rating for phone, laptop and small-battery capacity — a phone battery is around 3,000–5,000 mAh.
Frequently asked questions
How many milliampere-hours are in 1 coulomb?
1 coulomb (C) = 0.2777777778 milliampere-hours (mAh).
What is the formula to convert coulombs to milliampere-hours?
milliampere-hours = coulombs × 0.2777777778 — multiply the coulomb value by 0.277778.
How do I convert C to mAh without a calculator?
Multiply by 0.278 for a close estimate. Exact factor: 1 C = 0.2777777778 mAh.
Is this C-to-mAh converter accurate and private?
Yes. It uses the exact internationally defined conversion factors and computes results locally in your browser — your input is never sent to a server, and the page keeps working offline.