Charge Converter
Coulomb (C)
Definition: The coulomb (symbol: C) is the SI unit of electric charge. It is the charge transported by a constant current of one ampere in one second.
History/origin: Named after the French physicist Charles-Augustin de Coulomb, who developed Coulomb's law to describe the force between electrical charges in the 18th century.
Current use: The coulomb is the fundamental unit used in physics and electrical engineering to calculate electrical force and capacitance.
Milliampere-hour (mAh)
Definition: A milliampere-hour is one-thousandth of an ampere-hour. It measures the amount of electric charge a small battery can deliver.
History/origin: With the rise of portable consumer electronics like walkmans and later smartphones, mAh became the consumer-friendly way to describe battery life.
Current use: It is the most common unit used to specify the capacity of smartphone, tablet, and power bank batteries.
Coulomb (C) to Milliampere-hour (mAh) Conversion Table
| Coulomb (C) [c] | Milliampere-hour (mAh) [mah] |
|---|---|
| 0.01 c | 0.00277778 mah |
| 0.1 c | 0.02777778 mah |
| 1 c | 0.27777778 mah |
| 2 c | 0.55555556 mah |
| 3 c | 0.83333333 mah |
| 5 c | 1.38888889 mah |
| 10 c | 2.77777778 mah |
| 20 c | 5.55555556 mah |
| 50 c | 13.88888889 mah |
| 100 c | 27.77777778 mah |
| 1000 c | 277.77777778 mah |
How to Convert Coulomb (C) to Milliampere-hour (mAh)
1 c = 0.27777778 mah
1 mah = 3.6 c
Example: convert 15 c to mah:
15 c = 15 × 0.27777778 mah = 4.16666667 mah
Did You Know?
- Did you know? One Coulomb (C) is equivalent to the charge of approximately 6.242 quintillion (6.242 x 10¹⁸) electrons! It is named after Charles-Augustin de Coulomb.
- Smartphone batteries are usually rated in Milliampere-hours (mAh). If your phone has a 5,000 mAh battery, it can theoretically provide 5,000 milliamps of current for one hour.