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Coulomb to Ampere-hour
Convert Coulomb to Ampere-hour and get the exact value instantly.
About this conversion
To convert Coulomb to Ampere-hour, multiply the number of Coulomb by 0.0002777777778.
Electric charge is the coulomb in SI, yet battery capacity is quoted in ampere-hours and milliampere-hours, so converting between them tells you how long a cell will last.
Conversion table
| Coulomb (C) | Ampere-hour (Ah) |
|---|---|
| 1 C | 0.0002777777778 Ah |
| 2 C | 0.0005555555556 Ah |
| 5 C | 0.001388888889 Ah |
| 10 C | 0.002777777778 Ah |
| 100 C | 0.02777777778 Ah |
How to use this converter
- Enter your Coulomb value
Type any number into the Coulomb field. It starts at 1 so you can read the rate straight away.
- Read the Ampere-hour result
The amount in Ampere-hour updates as you type, so there is no button to press and nothing to wait for.
- Swap or keep exploring
Use the swap control to flip the direction, or pick a related conversion from the list below.
Frequently asked
- How many Ampere-hour are in one Coulomb?
- One Coulomb equals 0.0002777777778 Ah. Enter any amount above to get an exact figure for your own value.
- Is this converter accurate?
- Yes. It uses the exact international definition of each unit and computes on your device, so the only rounding is for display.
- Do you upload the numbers I enter?
- No. The Coulomb to Ampere-hour conversion runs entirely in your browser tab, and nothing you type is sent to a server.
- Does it work on my phone?
- Yes. It runs in any modern mobile browser and keeps working offline once the page has loaded.
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