Coulomb (C)
SI unit of electric charge: the charge carried by a current of one ampere in one second.
What is a coulomb?
- Symbol
- C
- Quantity
- Electric Charge
- Unit system
- SI
- Definition
- SI unit of electric charge: the charge carried by a current of one ampere in one second.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
The SI unit of electric charge. Used throughout physics, electrochemistry and electrical engineering.
Coulomb in other electric charge units
- 1 C = 1000 mCMillicoulomb
- 1 C = 1000000 µCMicrocoulomb
- 1 C = 1000000000 nCNanocoulomb
- 1 C ≈ 0.0002777777778 AhCoulomb to Ampere-hour converter
- 1 C ≈ 0.2777777778 mAhCoulomb to Milliampere-hour converter
- 1 C ≈ 6.241509074e+18 eElementary charge
- 1 C ≈ 0.00001036426966 F (charge)Faraday (charge)
- 1 C = 0.1 abCAbcoulomb
- 1 C = 2997924580 statCStatcoulomb
Coulomb quick reference
| Coulomb | Ampere-hour | Milliampere-hour | Millicoulomb |
|---|---|---|---|
| 1 C | ≈ 0.0002777777778 Ah | ≈ 0.2777777778 mAh | = 1000 mC |
| 10 C | ≈ 0.002777777778 Ah | ≈ 2.777777778 mAh | = 10000 mC |
| 100 C | ≈ 0.02777777778 Ah | ≈ 27.77777778 mAh | = 100000 mC |
| 1000 C | ≈ 0.2777777778 Ah | ≈ 277.7777778 mAh | = 1000000 mC |
Where the coulomb fits
The next smaller electric charge unit is the millicoulomb (mC). 1 C = 1000 mC, and 1 mC = 0.001 C.
The next larger electric charge unit is the milliampere-hour (mAh). 1 C ≈ 0.2777777778 mAh, and 1 mAh = 3.6 C.
Frequently asked questions
- How many ampere-hours are in one coulomb?
- One coulomb ≈ 0.0002777777778 Ah (ampere-hours).
- How many milliampere-hours are in one coulomb?
- One coulomb ≈ 0.2777777778 mAh (milliampere-hours).
- How many millicoulombs are in one coulomb?
- One coulomb = 1000 mC (millicoulombs).