Convert Coulombs to Kiloampere-hours
Convert Coulombs (C) to Kiloampere-hours (kAh) instantly and accurately.
Conversion Formula
kAh = C × 2.777777778e-7
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.
About Kiloampere-hours
The kiloampere-hour (kAh) equals 3.6 × 10⁶ C = 3.6 MC, the practical unit for grid-scale battery storage and large industrial electrolysis. A 100 MW·h utility-scale lithium-ion installation delivers roughly 27 kAh at typical operating voltages; aluminium Hall-Heroult cells consume approximately 13 500 kAh per tonne of aluminium. 1 kAh = 10³ Ah = 3.6 MC.
Quick Reference Table
| Coulombs (C) | Kiloampere-hours (kAh) |
|---|---|
| 1 C | 2.778 × 10-7 kAh |
| 2 C | 5.556 × 10-7 kAh |
| 5 C | 1.389 × 10-6 kAh |
| 10 C | 2.778 × 10-6 kAh |
| 25 C | 6.944 × 10-6 kAh |
| 50 C | 1.389 × 10-5 kAh |
| 100 C | 2.778 × 10-5 kAh |