Coulomb to Ampere-hour Converter
1 coulomb is about 0.0002777777778 ampere-hours. Convert coulombs (C) to ampere-hours (Ah) below: type a value and the result updates as you type.
C to Ah calculator
Result
Coulomb to Ampere-hour conversion
1 C ≈ 0.0002777777778 Ahone coulomb in ampere-hours
1 Ah = 3600 Cone ampere-hour in coulombs
Coulomb (C): SI unit of electric charge: the charge carried by a current of one ampere in one second.
Ampere-hour (Ah): The charge of one ampere flowing for one hour: exactly 3600 C. Car and storage batteries are rated in Ah.
Source:SI Brochure, 9th edition (BIPM, 2019)
How to convert coulombs to ampere-hours
To convert coulombs to ampere-hours, divide the number of coulombs by 3600.
Formula
Ah = C ÷ 3600
Examples
- 5 C = 5 ÷ 3600 ≈ 0.001388888889 Ah
- 25 C = 25 ÷ 3600 ≈ 0.006944444444 Ah
- 100 C = 100 ÷ 3600 ≈ 0.02777777778 Ah
Coulomb to Ampere-hour conversion table
| Coulomb (C) | Ampere-hour (Ah) |
|---|---|
| 0.1 C | 0.00002777777778 Ah |
| 0.5 C | 0.0001388888889 Ah |
| 1 C | 0.0002777777778 Ah |
| 2 C | 0.0005555555556 Ah |
| 3 C | 0.0008333333333 Ah |
| 5 C | 0.001388888889 Ah |
| 10 C | 0.002777777778 Ah |
| 20 C | 0.005555555556 Ah |
| 25 C | 0.006944444444 Ah |
| 50 C | 0.01388888889 Ah |
| 100 C | 0.02777777778 Ah |
| 250 C | 0.06944444444 Ah |
| 500 C | 0.1388888889 Ah |
| 1000 C | 0.2777777778 Ah |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many ampere-hours are in one coulomb?
- One coulomb is about 0.0002777777778 ampere-hours.
- How do I convert ampere-hours to coulombs?
- To convert ampere-hours to coulombs, multiply the number of ampere-hours by 3600. The formula is C = Ah × 3600.
- Is this conversion exact?
- Yes. Both units have exact definitions and the factor 3600 is exact. Displayed results are only rounded when they have many decimal places.
- Which is larger, a coulomb or a ampere-hour?
- A ampere-hour is 3600 times larger than a coulomb. In other words, a coulomb is exactly 1/3600 of a ampere-hour.