Ampere-hours to coulombs
Type a value in ampere-hours to see it in coulombs straight away, or type in the second box to convert back.
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How to use it
- Type the value in the ampere-hours box.
- Read the result in coulombs as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
C = Ah × 3,600
Multiply the value in ampere-hours by 3,600 to get coulombs.
Example
To convert 25 Ah to coulombs: 25 × 3,600 = 90,000 C.
Conversion table
| Ampere-hours (Ah) | Coulombs (C) |
|---|---|
| 1 | 3,600 |
| 2 | 7,200 |
| 3 | 10,800 |
| 5 | 18,000 |
| 10 | 36,000 |
| 20 | 72,000 |
| 25 | 90,000 |
| 50 | 180,000 |
| 100 | 360,000 |
| 250 | 900,000 |
| 500 | 1,800,000 |
| 1,000 | 3,600,000 |
About the units
- Ampere-hour
- The charge moved by one ampere flowing for one hour, exactly 3600 coulombs, used for car and solar battery capacity.
- Coulomb
- The SI unit of charge: the charge carried by a current of one ampere in one second, so 1 C = 1 A·s.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many coulombs are in one ampere-hour?
1 Ah = 3,600 C exactly.
How do I convert ampere-hours to coulombs?
Use C = Ah × 3,600. For example, 25 Ah = 90,000 C.
How many ampere-hours are in one coulomb?
1 C = 0.000277778 Ah.
How do I convert battery mAh to watt-hours?
You need the battery voltage: Wh equals mAh times volts divided by 1000. A 5000 mAh battery at 3.7 V holds 18.5 Wh.
How many coulombs are in an ampere-hour?
Exactly 3600 coulombs, because an ampere-hour is one ampere flowing for 3600 seconds.