How many coulombs are in one ampere-hour?

One ampere-hour equals exactly 3600 coulombs. This comes from the definition: 1 Ah = 1 A × 3600 s = 3600 C (since 1 coulomb = 1 ampere × 1 second and there are 3600 seconds in one hour).

What is an ampere-hour used for?

Ampere-hours measure the total electric charge a battery can deliver. A 100 Ah battery can supply 100 A for one hour, or 10 A for ten hours. It is the standard unit on battery labels for cars, phones, and energy storage systems.

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

How do I convert coulombs back to ampere-hours?

Divide the coulomb value by 3600. For example, 18000 C ÷ 3600 = 5 Ah. Use the swap button in this tool to perform the reverse conversion automatically.

Can I convert milliampere-hours (mAh) using this tool?

Yes. Enter the mAh value divided by 1000 to get Ah first (e.g. 2000 mAh = 2 Ah), then convert. The result will be in coulombs. For example, 2000 mAh = 2 Ah = 7200 C.

Ampere Hours to Coulombs Converter

Name: Ampere Hours to Coulombs Converter
Availability: InStock
Author: Nham Vu

Enter a charge value in ampere-hours (Ah) and instantly get the equivalent in coulombs (C); 1 Ah = 3600 C.

Electric Charge Conversion

Value in Ampere-hours (Ah)

Result in Coulombs (C)

Formula

Coulombs = Ampere-hours × 3600

1 Ah = 1 A × 3600 s = 3600 C

Quick Reference

Ah	Coulombs (C)
0.001 Ah	3.6 C
0.01 Ah	36 C
0.1 Ah	360 C
1 Ah	3,600 C
5 Ah	18,000 C
10 Ah	36,000 C
100 Ah	360,000 C
200 Ah	720,000 C

Summary