How many coulombs are in one milliampere-hour?

One milliampere-hour equals exactly 3.6 coulombs. A milliampere is one-thousandth of an ampere, so 1 mAh = 0.001 A × 3600 s = 3.6 C.

What is a milliampere-hour (mAh)?

The milliampere-hour is a unit of electric charge commonly used to rate the capacity of small batteries such as those in smartphones, earbuds, and portable power banks. A 3000 mAh battery can supply 3000 mA (3 A) for one hour, or 300 mA for ten hours.

The coulomb (C) is the SI base unit of electric charge. One coulomb is the amount of charge transported by one ampere of current in one second. It appears in formulas involving capacitors, electrochemistry, and electric field calculations.

How do I convert coulombs back to mAh?

Divide the coulomb value by 3.6. For example, 18 C ÷ 3.6 = 5 mAh. The swap button in this tool performs the reverse conversion automatically.

How does mAh relate to ampere-hours (Ah)?

1000 mAh = 1 Ah. So 1 mAh = 0.001 Ah, and since 1 Ah = 3600 C, 1 mAh = 3.6 C. For large batteries rated in Ah, multiply by 3600 instead.

mAh to Coulombs Converter

Name: mAh to Coulombs Converter
Availability: InStock
Author: Nham Vu

Enter a charge value in milliampere-hours (mAh) and instantly get the equivalent in coulombs (C); 1 mAh = 3.6 C.

Electric Charge Conversion

Value in Milliampere-hours (mAh)

Result in Coulombs (C)

Formula

Coulombs = mAh × 3.6

1 mAh = 0.001 A × 3600 s = 3.6 C

Quick Reference

mAh	Coulombs (C)
100 mAh	360 C
500 mAh	1,800 C
1,000 mAh	3,600 C
2,000 mAh	7,200 C
3,000 mAh	10,800 C
5,000 mAh	18,000 C
10,000 mAh	36,000 C
20,000 mAh	72,000 C

Summary