Convert Coulomb to Ampere-hour
Live bidirectional calculator for Coulombs (C) and Ampere-hours (Ah) with verified formula and conversion charts.
Electric Charge8 units
How the Calculation Works (Linear Scaling)
Since 1 Ampere-hour = 3600 Coulombs, divide the value in Coulombs by 3600.
Coulomb to Ampere-hour Conversion Table
Precomputed values for quick reference and printing.
| Coulomb | Ampere-hour |
|---|---|
| 1 C | 0.0003 Ah |
| 2 C | 0.0006 Ah |
| 3 C | 0.0008 Ah |
| 4 C | 0.0011 Ah |
| 5 C | 0.0014 Ah |
| 6 C | 0.0017 Ah |
| 7 C | 0.0019 Ah |
| 8 C | 0.0022 Ah |
| 9 C | 0.0025 Ah |
| 10 C | 0.0028 Ah |
| 15 C | 0.0042 Ah |
| 20 C | 0.0056 Ah |
| 25 C | 0.0069 Ah |
| 30 C | 0.0083 Ah |
| 40 C | 0.0111 Ah |
| 50 C | 0.0139 Ah |
| 75 C | 0.0208 Ah |
| 100 C | 0.0278 Ah |
| Ampere-hour | Coulomb |
|---|---|
| 1 Ah | 3600 C |
| 2 Ah | 7200 C |
| 3 Ah | 10800 C |
| 4 Ah | 14400 C |
| 5 Ah | 18000 C |
| 6 Ah | 21600 C |
| 7 Ah | 25200 C |
| 8 Ah | 28800 C |
| 9 Ah | 32400 C |
| 10 Ah | 36000 C |
| 15 Ah | 54000 C |
| 20 Ah | 72000 C |
| 25 Ah | 90000 C |
| 30 Ah | 108000 C |
| 40 Ah | 144000 C |
| 50 Ah | 180000 C |
| 75 Ah | 270000 C |
| 100 Ah | 360000 C |
๐ Standard Benchmark Reference Values
Standard battery capacity definition (1 ampere continuously for 3,600 seconds).
Exact RatioAbout Coulomb (C)
The SI base unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere (1 C = 1 Aยทs).
History: Named after French physicist Charles-Augustin de Coulomb who formulated Coulombโs law of electrostatic force in 1785.
Common Uses: Standard measure of electrostatic charge, capacitor stored charge (Q = CV), and chemical electroplating.
About Ampere-hour (Ah)
Unit of electric charge equal to the charge transferred by a steady current of one ampere flowing for one hour (3,600 C).
History: Long-standing international electrical industry standard for electrochemical battery energy storage capacity.
Common Uses: Automotive lead-acid battery capacity, deep-cycle solar storage, and marine battery ratings.
โ Frequently Asked Questions
How many Ampere-hours are in 1 Coulomb?
There are exactly 0.000278 Ampere-hours in 1 Coulomb (1 C = 0.000278 Ah).
What is the formula to convert Coulomb to Ampere-hour?
The formula is: Ampere-hour = Coulomb / 3600. Since 1 Ampere-hour = 3600 Coulombs, divide the value in Coulombs by 3600.
How do I convert 1 C to Ah manually?
To convert 1 C to Ah: apply the formula Ampere-hour = Coulomb / 3600. Substituting gives: 1 / 3600 = 0.0003 Ah.