Convert Milliampere-hours to Coulombs
Convert Milliampere-hours (mAh) to Coulombs (C) instantly and accurately.
Conversion Formula
C = mAh × 3.6
About Milliampere-hours
The milliampere-hour (mAh) equals exactly 3.6 C and is the universal capacity unit for portable-electronics batteries. Smartphone batteries range from 3 000-5 000 mAh; AA alkaline cells deliver ≈2 500 mAh; small lithium coin cells for RTC modules are rated 35-225 mAh. 1 mAh = 3.6 C = 10⁻³ Ah.
About Coulombs
The coulomb (C) is the SI derived unit of electric charge, equal to the charge transported by a current of 1 A in 1 s. In the 2019 SI revision it is fixed exactly via the elementary charge: 1 C = 1 / (1.602 176 634 × 10⁻¹⁹) e ≈ 6.241 × 10¹⁸ e. Practical benchmarks: a 1 Ah battery stores 3 600 C; a lightning bolt transfers 1-20 C.
Quick Reference Table
| Milliampere-hours (mAh) | Coulombs (C) |
|---|---|
| 1 mAh | 3.6 C |
| 2 mAh | 7.2 C |
| 5 mAh | 18 C |
| 10 mAh | 36 C |
| 25 mAh | 90 C |
| 50 mAh | 180 C |
| 100 mAh | 360 C |