Convert coulombs to ah
1 coulomb equals 0.00027777778 ampere-hours. Enter a value below to convert instantly.
Multiply the number of coulombs by 0.000277777777778 to get ampere-hours. How this is calculated
Need the other direction? Convert ampere-hour to coulomb →
Formula
Multiply the number of coulombs by 0.000277777777778 to get ampere-hours.
Step by step
- Start with 1 C.
- Multiply by the conversion factor 0.000277777777778.
- 1 × 0.000277777777778 = 0.00027777778 A·h.
Coulombs to Ampere-hours conversion table
| Coulombs (C) | Ampere-hours (A·h) |
|---|---|
| 1 | 0.00027777778 |
| 2 | 0.00055555556 |
| 5 | 0.0013888889 |
| 10 | 0.0027777778 |
| 20 | 0.0055555556 |
| 50 | 0.013888889 |
| 100 | 0.027777778 |
| 500 | 0.13888889 |
Convert Coulomb to other electric charge units
1 C expressed in every other electric charge unit on this site.
- Coulomb C 1
- Megacoulomb MC 0.000001
- Kilocoulomb kC 0.001
- Millicoulomb mC 1,000
- Microcoulomb µC 1,000,000
- Nanocoulomb nC 1,000,000,000
- Picocoulomb pC 1,000,000,000,000
- Ampere-hour A·h 0.00027777778
- Milliampere-hour mA·h 0.27777778
- Ampere-minute A·min 0.016666667
- Ampere-second A·s 1
- Abcoulomb abC 0.1
- Statcoulomb statC 2,997,924,500
- Faraday F 0.00001036427
- Elementary Charge e 6.2415091e+18
About the coulomb
The coulomb (C) is a SI unit of electric charge.
About the ampere-hour
The ampere-hour (A·h) is a Other unit of electric charge. Battery capacity: one ampere delivered for one hour.
Where this conversion is used
Converting coulombs to ampere-hours comes up when battery capacity, capacitor sizing, and electrochemistry. A milliampere-hour is a charge, not an energy — comparing batteries at different voltages needs watt-hours instead.
Related conversions
Frequently asked questions
How many ampere-hours are in a coulomb?
One coulomb equals 0.00027777778 ampere-hours.
How do you convert coulombs to ampere-hours?
Multiply the number of coulombs by 0.000277777777778 to get ampere-hours.
What is 1 ampere-hour in coulombs?
One ampere-hour equals 3,600 coulombs.
When would I convert coulombs to ampere-hours?
This conversion is common when battery capacity, capacitor sizing, and electrochemistry.
Conversion factors are based on internationally agreed unit definitions. See our methodology and sources for details on how these values are verified.