Milliampere-hours to coulombs
Type a value in milliampere-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 milliampere-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 = mAh × 3.6
Multiply the value in milliampere-hours by 3.6 to get coulombs.
Example
To convert 25 mAh to coulombs: 25 × 3.6 = 90 C.
Conversion table
| Milliampere-hours (mAh) | Coulombs (C) |
|---|---|
| 1 | 3.6 |
| 2 | 7.2 |
| 3 | 10.8 |
| 5 | 18 |
| 10 | 36 |
| 20 | 72 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
| 250 | 900 |
| 500 | 1,800 |
| 1,000 | 3,600 |
About the units
- Milliampere-hour
- One thousandth of an ampere-hour, exactly 3.6 coulombs, the figure printed on phone batteries and power banks.
- 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 milliampere-hour?
1 mAh = 3.6 C exactly.
How do I convert milliampere-hours to coulombs?
Use C = mAh × 3.6. For example, 25 mAh = 90 C.
How many milliampere-hours are in one coulomb?
1 C = 0.277778 mAh.
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.