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Coulomb to Milliampere-hour

Convert Coulomb to Milliampere-hour and get the exact value instantly.

1 C = 0.2777777778 mAh

About this conversion

To convert Coulomb to Milliampere-hour, multiply the number of Coulomb by 0.2777777778.

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)Milliampere-hour (mAh)
1 C0.2777777778 mAh
2 C0.5555555556 mAh
5 C1.388888889 mAh
10 C2.777777778 mAh
100 C27.77777778 mAh

How to use this converter

  1. Enter your Coulomb value

    Type any number into the Coulomb field. It starts at 1 so you can read the rate straight away.

  2. Read the Milliampere-hour result

    The amount in Milliampere-hour updates as you type, so there is no button to press and nothing to wait for.

  3. 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 Milliampere-hour are in one Coulomb?
One Coulomb equals 0.2777777778 mAh. 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 Milliampere-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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