How many mAh are in one coulomb?

One coulomb equals 1000/3600 mAh, which is approximately 0.27778 mAh. This comes from 1 C = 1 A·s, and 1 mAh = 0.001 A × 3600 s = 3.6 C, so 1 C = 1/3.6 mAh ≈ 0.27778 mAh.

The coulomb (C) is the SI base unit of electric charge. One coulomb is the charge transported by one ampere of current flowing for one second. It is used in physics equations, capacitor specs, and electrochemistry.

What is a milliampere-hour (mAh)?

A milliampere-hour (mAh) is a unit of electric charge equal to one-thousandth of an ampere-hour. It is the standard capacity unit on phone batteries, power banks, and small rechargeable cells.

How do I convert mAh back to coulombs?

Multiply the mAh value by 3.6. For example, 1000 mAh × 3.6 = 3600 C. Use the swap button in this tool to perform the reverse conversion automatically.

Is 1 coulomb a large or small charge for a battery?

For consumer batteries it is tiny. A typical smartphone battery holds around 15,000–18,000 C (roughly 4,000–5,000 mAh). One coulomb represents less than a second of use at normal smartphone drain rates.

Coulombs to mAh Converter

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

Enter a charge in coulombs and instantly get the equivalent in milliampere-hours (mAh); 1 C = 1000/3600 mAh ≈ 0.27778 mAh.

Electric Charge Conversion

Value in Coulombs (C)

Result in Milliampere-hours (mAh)

Formula

mAh = C × 1000 ÷ 3600

1 C ≈ 0.27778 mAh | 1 mAh = 3.6 C

Quick Reference

Coulombs (C)	mAh
1 C	0.2778 mAh
10 C	2.778 mAh
100 C	27.78 mAh
360 C	100 mAh
3,600 C	1,000 mAh (1 Ah)
18,000 C	5,000 mAh
36,000 C	10,000 mAh
72,000 C	20,000 mAh

Summary