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Electrical

CtomA·h

Convert coulombs (C) to milliampere-hours (mA·h).

Factor1 C = 0.2777778 mA·h

Converter

C

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

Result
1mA·h

Rendered to 6 significant figures.

Formula

Formula
mA·h = C × 0.2777778

Multiply any value in coulombs by 0.2777778 to obtain the value in milliampere-hours.

Worked example

Convert 3.6 C to mA·h.

  1. 01Start with 3.6 C.
  2. 02Multiply by the conversion factor: 3.6 × 0.2777778 = 1 mA·h.
Result3.6 C = 1 mA·h

Conversion table

CmA·h
10.27778
20.55556
51.3889
102.7778
205.5556
5013.889
10027.778
20055.556
500138.89
1000277.78

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from C to mA·h?
1 C equals 0.2777778 mA·h. To convert, multiply the value in coulombs by 0.2777778.
How do I convert 1 C to mA·h?
1 C = 0.277778 mA·h. For any value, multiply by 0.2777778.
How do I convert mA·h back to C?
Divide by the same factor — or equivalently, multiply by 3.6. So 1 mA·h = 3.6 C.
When would I need to convert coulomb to milliampere-hour?
Electric-charge conversions between C and mA·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 mA·h are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).

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