Convert Ampere-hour to Coulomb
Use this free converter to change ampere-hours (Ah) into coulombs (C). Ampere-hour and coulomb both measure electric charge. As a quick reference, 1 Ah equals 3600 C, and 1 C equals 0.00027777778 Ah.
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Coulomb (C)
3600
1 Ah = 3600 C
Electric Charge conversion table
| Ampere-hour | Coulomb |
|---|---|
| 0.01 | 36 |
| 0.1 | 360 |
| 0.5 | 1800 |
| 1 | 3600 |
| 2 | 7200 |
| 3 | 10800 |
| 5 | 18000 |
| 10 | 36000 |
| 20 | 72000 |
| 25 | 90000 |
| 50 | 180000 |
| 100 | 360000 |
| 1,000 | 3600000 |
How to convert Ampere-hour to Coulomb
Multiply the ampere-hour value by 3600 to get coulombs.
- Enter the number of ampere-hours you want to convert.
- The converter instantly shows the equivalent value in coulombs.
- Worked example: 15 Ah × 3600 = 54000 C.
- Use the swap button to reverse the conversion (coulomb to ampere-hour).
About these units
Ampere-hour (Ah)
- Definition
- An ampere-hour (Ah) is a unit of electric charge equal to 3,600 coulombs — the charge transferred by one ampere flowing for one hour.
- History
- It came into widespread use with the commercialisation of lead-acid batteries in the late 19th century.
- Current use
- Ampere-hours rate battery capacity in electric vehicles, uninterruptible power supplies, and solar storage systems.
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.
Frequently asked questions
How many coulombs are in a ampere-hour?
There are 3600 C in 1 Ah. To convert, multiply the number of ampere-hours by 3600.
How do I convert ampere-hours to coulombs?
Multiply the ampere-hour value by 3600 to get coulombs. For example, 10 Ah = 36000 C.
Is this ampere-hour-to-coulomb 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 Ampere-hour to other electric charge units
| Unit | 1 Ampere-hour equals |
|---|---|
| Coulomb (C) | 3600 C |
| Millicoulomb (mC) | 3600000 mC |
| Microcoulomb (µC) | 3600000000 µC |
| Nanocoulomb (nC) | 3.6000e+12 nC |
| Milliampere-hour (mAh) | 1000 mAh |