Ampere-hour (Ah)
The charge of one ampere flowing for one hour: exactly 3600 C. Car and storage batteries are rated in Ah.
What is an ampere-hour?
- Symbol
- Ah
- Quantity
- Electric Charge
- Unit system
- SI-accepted
- Definition
- The charge of one ampere flowing for one hour: exactly 3600 C. Car and storage batteries are rated in Ah.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used to rate car, truck, solar and other storage batteries. It measures charge, not energy.
Ampere-hour in other electric charge units
- 1 Ah = 3600 CAmpere-hour to Coulomb converter
- 1 Ah = 3600000 mCMillicoulomb
- 1 Ah = 3600000000 µCMicrocoulomb
- 1 Ah = 3600000000000 nCNanocoulomb
- 1 Ah = 1000 mAhAmpere-hour to Milliampere-hour converter
- 1 Ah ≈ 2.246943267e+22 eElementary charge
- 1 Ah ≈ 0.03731137076 F (charge)Faraday (charge)
- 1 Ah = 360 abCAbcoulomb
- 1 Ah = 10792528488000 statCStatcoulomb
Ampere-hour quick reference
| Ampere-hour | Coulomb | Milliampere-hour | Millicoulomb |
|---|---|---|---|
| 1 Ah | = 3600 C | = 1000 mAh | = 3600000 mC |
| 10 Ah | = 36000 C | = 10000 mAh | = 36000000 mC |
| 100 Ah | = 360000 C | = 100000 mAh | = 360000000 mC |
| 1000 Ah | = 3600000 C | = 1000000 mAh | = 3600000000 mC |
Where the ampere-hour fits
The next smaller electric charge unit is the abcoulomb (abC). 1 Ah = 360 abC, and 1 abC ≈ 0.002777777778 Ah.
The next larger electric charge unit is the faraday (F (charge)). 1 Ah ≈ 0.03731137076 F (charge), and 1 F (charge) = 26.801481145363894 Ah.
Frequently asked questions
- How many coulombs are in one ampere-hour?
- One ampere-hour = 3600 C (coulombs).
- How many milliampere-hours are in one ampere-hour?
- One ampere-hour = 1000 mAh (milliampere-hours).
- How many millicoulombs are in one ampere-hour?
- One ampere-hour = 3600000 mC (millicoulombs).