Convert Coulombs to Ah
Convert coulombs to ampere-hours by entering a value below.
How to Convert Coulombs to Ampere-hours
The coulomb and ampere-hour are both units of electric charge. By definition, 1 ampere-hour equals exactly 3600 coulombs. This means to convert coulombs to ampere-hours, you divide by 3600.
Formula
Step-by-Step Example
Convert 5 C to ampere-hours:
We need to convert coulombs to ampere-hours
Since 1 Ah = 3600 C, divide by 3600
5 ÷ 3600 = 0.0013888889
5 C = 0.0013888889 Ah
Coulomb to Ampere-hour Conversion Table
Quick reference table for common coulomb to ampere-hour conversions. Click any value for detailed calculation.
| Coulombs (C) | Ampere-hours (Ah) |
|---|---|
| 0.1 C | 2.7777777778e-5 Ah |
| 0.5 C | 0.0001388889 Ah |
| 1 C | 0.0002777778 Ah |
| 2 C | 0.0005555556 Ah |
| 5 C | 0.0013888889 Ah |
| 10 C | 0.0027777778 Ah |
| 25 C | 0.0069444444 Ah |
| 50 C | 0.0138888889 Ah |
| 100 C | 0.0277777778 Ah |
About These Units
Coulomb (C)
The coulomb (C) is the SI unit of electric charge, defined as the charge transferred by 1 ampere flowing for 1 second. One coulomb equals 6.242×10¹⁸ elementary charges (electrons or protons). Named after physicist Charles-Augustin de Coulomb. Formula: Q = I × t (charge = current × time).
Ampere-hour (Ah)
An ampere-hour (Ah) equals 3,600 coulombs—the charge delivered by 1 ampere flowing for 1 hour. Standard battery capacity unit: car batteries 50-100 Ah, deep-cycle batteries 100-400 Ah, EV batteries measured in kWh (Ah × voltage). One Ah = 1000 mAh.
Frequently Asked Questions
How do I convert coulombs to ampere-hours?
To convert coulombs to ampere-hours, divide the value by 3600. For example, 10 C = 0.0027777778 Ah.
How many ampere-hours are in 1 coulomb?
1 coulomb equals 0.0002777778 ampere-hours.
What is the formula for coulombs to ampere-hours?
The formula is: Ah = C ÷ 3600.