Coulombs to Ampere-hours (C to A·h)
Free online coulomb to ampere-hour converter. Type a value, get an instant exact result — plus the formula, a ready-made conversion table, and reverse conversion.
ELECTRIC CHARGE CONVERTER — INSTANT RESULT
Formula: multiply the coulomb value by 0.00027777778 — i.e. A·h = C × 0.00027777778
Quick check: 1 C = 0.00027777778 A·h
Quick check: 1 C = 0.00027777778 A·h
Coulombs to Ampere-hours conversion table
| Coulombs (C) | Ampere-hours (A·h) |
|---|---|
| 1 C | 0.00027777778 A·h |
| 2 C | 0.00055555556 A·h |
| 3 C | 0.00083333333 A·h |
| 4 C | 0.0011111111 A·h |
| 5 C | 0.0013888889 A·h |
| 6 C | 0.0016666667 A·h |
| 7 C | 0.0019444444 A·h |
| 8 C | 0.0022222222 A·h |
| 9 C | 0.0025 A·h |
| 10 C | 0.0027777778 A·h |
| 15 C | 0.0041666667 A·h |
| 20 C | 0.0055555556 A·h |
| 25 C | 0.0069444444 A·h |
| 30 C | 0.0083333333 A·h |
| 40 C | 0.011111111 A·h |
| 50 C | 0.013888889 A·h |
| 75 C | 0.020833333 A·h |
| 100 C | 0.027777778 A·h |
| 250 C | 0.069444444 A·h |
| 500 C | 0.13888889 A·h |
| 1,000 C | 0.27777778 A·h |
How to convert coulombs to ampere-hours
To convert coulombs to ampere-hours, multiply the amount in coulombs by 0.00027777778. For example, 10 C = 0.0027777778 A·h. To convert in the other direction, divide by the same factor, or use the ⇄ swap button above.
Convert electric charge between coulombs, ampere-hours and faradays. One ampere-hour is 3600 coulombs; one faraday is the charge of one mole of electrons.
Frequently asked questions
How many ampere-hours are in one coulomb?
One coulomb is exactly 0.00027777778 ampere-hours.
How do I convert C to A·h?
Multiply the C value by 0.00027777778 to get A·h. The converter at the top of this page does this automatically and works in both directions.
How much is 100 coulombs in ampere-hours?
100 coulombs equals 0.027777778 ampere-hours.