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Electrical

CtoA·h

Convert coulombs (C) to ampere-hours (A·h).

Factor1 C = 0.0002777778 A·h

Converter

C

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1A·h

Rendered to 6 significant figures.

Formula

Formula
A·h = C × 0.0002777778

Multiply any value in coulombs by 0.0002777778 to obtain the value in ampere-hours.

Worked example

Convert 3600 C to A·h.

  1. 01Start with 3600 C.
  2. 02Multiply by the conversion factor: 3600 × 0.0002777778 = 1 A·h.
Result3600 C = 1 A·h

Conversion table

CA·h
10.00027778
20.00055556
50.0013889
100.0027778
200.0055556
500.013889
1000.027778
2000.055556
5000.13889
10000.27778

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from C to A·h?
1 C equals 0.0002777778 A·h. To convert, multiply the value in coulombs by 0.0002777778.
How do I convert 1 C to A·h?
1 C = 0.000277778 A·h. For any value, multiply by 0.0002777778.
How do I convert A·h back to C?
Divide by the same factor — or equivalently, multiply by 3600. So 1 A·h = 3600 C.
When would I need to convert coulomb to ampere-hour?
Electric-charge conversions between C and A·h appear in battery capacity specification (A·h, mA·h), electroplating and electrochemistry (coulombs of charge transferred), and capacitor energy calculations. 1 A·h is exactly 3600 C — the conversion is a linear factor and does not depend on voltage, current profile or chemistry.
Is the conversion exact?
Yes. Both C and A·h are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).

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