Coulombs to Ampere-hours
Type a value in Coulombs and get the result in Ampere-hours, calculated exactly.
3,000 Coulombs ≈ 0.8333333333 Ampere-hours
Precision
Exact factorRounded for display to about 10 significant digits.
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Formula
Ah = C ÷ 3,600
To convert Coulombs to Ampere-hours, divide the value by 3,600.
Worked examples
- 1 C ÷ 3,600 ≈ 0.000277777778 Ah
- 3,000 C ÷ 3,600 ≈ 0.8333333333 Ah
- 100 C ÷ 3,600 ≈ 0.02777777778 Ah
This factor is exact by definition.
Conversion table
| Coulombs (C) | Ampere-hours (Ah) |
|---|---|
| 1 | ≈ 0.0002777778 |
| 2 | ≈ 0.0005555556 |
| 3 | ≈ 0.0008333333 |
| 4 | ≈ 0.001111111 |
| 5 | ≈ 0.001388889 |
| 6 | ≈ 0.001666667 |
| 7 | ≈ 0.001944444 |
| 8 | ≈ 0.002222222 |
| 9 | 0.0025 |
| 10 | ≈ 0.002777778 |
| 15 | ≈ 0.004166667 |
| 20 | ≈ 0.005555556 |
| 25 | ≈ 0.006944444 |
| 30 | ≈ 0.008333333 |
| 40 | ≈ 0.01111111 |
| 50 | ≈ 0.01388889 |
| 60 | ≈ 0.01666667 |
| 70 | ≈ 0.01944444 |
| 75 | ≈ 0.02083333 |
| 80 | ≈ 0.02222222 |
| 90 | 0.025 |
| 100 | ≈ 0.02777778 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Ampere-hours to Coulombs
| Ampere-hours (Ah) | Coulombs (C) |
|---|---|
| 1 | 3,600 |
| 2 | 7,200 |
| 3 | 10,800 |
| 4 | 14,400 |
| 5 | 18,000 |
| 6 | 21,600 |
| 7 | 25,200 |
| 8 | 28,800 |
| 9 | 32,400 |
| 10 | 36,000 |
| 15 | 54,000 |
| 20 | 72,000 |
| 25 | 90,000 |
| 30 | 108,000 |
| 40 | 144,000 |
| 50 | 180,000 |
| 60 | 216,000 |
| 70 | 252,000 |
| 75 | 270,000 |
| 80 | 288,000 |
| 90 | 324,000 |
| 100 | 360,000 |
Unit definitions
- Coulombs C
- The SI unit of charge: one ampere for one second.
- Ampere-hours Ah
- One ampere for one hour: exactly 3600 coulombs.
Questions people ask
Coulombs to Ampere-hours: what is the conversion factor?
One C is ≈ 0.000277777778 Ah.
How do I convert Coulombs to Ampere-hours?
Use the formula above. For example, 3,000 C = ≈ 0.8333333333 Ah.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.