Ampere-hours to Coulombs
1 ampere-hour = 3,600 coulombs · 1 C = 0.00027778 A·h
1 ampere-hour = 3,600 coulombs
How it’s calculated
C = A·h × 3600
- Multiply the value in ampere-hours by 3600.
- To go back, divide by 3600 (or multiply by 0.0002777777778).
- 1 A·h = 3,600 C · 1 C = 0.0002777777778 A·h
Show worked solutionFactor, unit cancellation and rounding, step by step
Find the conversion factor
By definition 1 A·h = 3600 C. Source: NIST SP 811 / Handbook 44; BIPM SI Brochure (9th ed.).
Multiply by the factor written as a fraction
Put A·h in the denominator so it cancels, leaving C.
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 3600 C
1 A·h in other units
Batch convert A·h → C
- 1 A·h = 3600 C
- 5 A·h = 18000 C
- 10 A·h = 36000 C
- 25 A·h = 90000 C
Quick examples
- 1 ampere-hour = 3,600 coulombs
- 5 ampere-hours = 18,000 coulombs
- 10 ampere-hours = 36,000 coulombs
- 25 ampere-hours = 90,000 coulombs
- 100 ampere-hours = 360,000 coulombs
About these units
Ampere-hour (A·h)
other
Exactly 3 600 C. Battery capacity unit.
1 A·h = 3600 C
Source: NIST SP 811 / Handbook 44
Coulomb (C)
SI (metric)
SI unit of electric charge: 1 A·s.
Base unit
Source: BIPM SI Brochure (9th ed.)
Ampere-hours to coulombs conversion table
| Ampere-hours (A·h) | Coulombs (C) |
|---|---|
| 100 A·h | 360,000 C |
| 500 A·h | 1,800,000 C |
| 1,000 A·h | 3,600,000 C |
| 1,500 A·h | 5,400,000 C |
| 2,000 A·h | 7,200,000 C |
| 2,500 A·h | 9,000,000 C |
| 3,000 A·h | 10,800,000 C |
| 3,500 A·h | 12,600,000 C |
| 4,000 A·h | 14,400,000 C |
| 4,500 A·h | 16,200,000 C |
| 5,000 A·h | 18,000,000 C |
| 10,000 A·h | 36,000,000 C |
| 20,000 A·h | 72,000,000 C |
Related conversions
Frequently asked questions
How do I convert ampere-hours to coulombs?
Use C = A·h × 3600. Multiply the value in ampere-hours by 3600.
How many coulombs are in 1 ampere-hour?
1 ampere-hour (A·h) equals 3,600 coulombs (C).
How many ampere-hours are in 1 coulomb?
1 coulomb (C) equals 0.00027778 ampere-hours (A·h); more precisely 0.0002777777778.
What is 100 A·h in C?
100 ampere-hours = 360,000 coulombs.
What is a ampere-hour?
Exactly 3 600 C. Battery capacity unit.
What is a coulomb?
SI unit of electric charge: 1 A·s.
Formula: C = A·h × 3600. Factors last reviewed 2026-10-27.