CalcKit
Electric Charge Converter
Electric charge (Q) is the property that makes particles attract or repel each other. Its SI unit is the coulomb (C), the charge a current of one ampere carries in one second: Q = I * t. That is why charge is also given in ampere-seconds and, for batteries, ampere-hours.
One coulomb is about 6.24 × 10¹⁸ elementary charges, the charge of one proton or electron.
How to convert charge units
Type a value into any field, and every other unit is calculated at once. For example, a phone battery rated 4,000 mAh, which is 4 A·h:
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In coulombs: multiply by 3,600, the seconds in an hour.
4 × 3,600 = 14,400 C -
In ampere-minutes: multiply by 60.
4 × 60 = 240 A·min
A battery's charge in A·h times its voltage gives its energy in watt-hours: 4 A·h at 3.85 V is about 15.4 Wh.
Common conversions
| Value | Equals |
|---|---|
| 1 A•h | 3,600 C |
| 1 C | 0.000277778 A•h |
| 1 A•min | 60 C |
| 1 mC | 1,000 µC |
| 1 C | 6.24151 × 10¹⁸ e |
| 1 e | 1.60218 × 10⁻¹⁹ C |
| 1 statC | 3.33564 × 10⁻¹⁰ C |
Electric charge units
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Coulomb (C): The coulomb is the SI unit of electric charge and is defined as the amount of charge transferred by a current of one ampere in one second.
Conversion Factor: 1 C = 1 C (Base Unit) -
Kilocoulomb (kC): One kilocoulomb is equal to one thousand coulombs.
Conversion Factor: 1 kC = 1,000 C -
Megacoulomb (MC): One megacoulomb is equal to one million coulombs.
Conversion Factor: 1 MC = 1,000,000 C -
Millicoulomb (mC): One millicoulomb is equal to one-thousandth of a coulomb.
Conversion Factor: 1 mC = 0.001 C -
Microcoulomb (μC): One microcoulomb is equal to one-millionth of a coulomb.
Conversion Factor: 1 μC = 0.000001 C -
Ampere-second (A•s): An ampere-second is the product of current in amperes and time in seconds. It is equivalent to coulomb and represents the quantity of charge flowing through a circuit in one second.
Conversion Factor: 1 A•s = 1 C -
Ampere-minute (A•min): An ampere-minute is the product of current in amperes and time in minutes.
Conversion Factor: 1 A•min = 60 A•s = 60 C -
Ampere-hour (A•h): An ampere-hour is the product of current in amperes and time in hours.
Conversion Factor: 1 A•h = 60 A•min = 3,600 A•s = 3,600 C -
Abcoulomb (abC): The abcoulomb or electromagnetic unit of charge (emu of charge) is the derived physical unit of electric charge in the cgs-emu system of units. One abcoulomb is equal to ten coulombs. It is the charge flowing in 1 second given a current of 1 abampere.
Conversion Factor: 1 abC = 10 C -
EMU of charge (EMU): Electromagnetic unit of charge is another name for the abcoulomb.
Conversion Factor: 1 EMU = 1 abC = 10 C -
ESU of charge (ESU): Electrostatic unit of charge, also known as the statcoulomb, is the charge unit in the cgs (centimeter-gram-second) electrostatic units variant and Gaussian systems of units. It is equal to the quantity of charge transferred in one second across a conductor in which there is a constant current of one statampere.
Conversion Factor: 1 ESU ≈ 3.33564 * 10^-10 C -
Statcoulomb (statC): The statcoulomb is another name for the electrostatic unit of charge.
Conversion Factor: 1 statC = 1 ESU ≈ 3.33564 * 10^-10 C -
Franklin (Fr): The franklin is another name for the statcoulomb.
Conversion Factor: 1 Fr = 1 statC ≈ 3.33564 * 10^-10 C -
Elementary charge (e): The elementary charge is the electric charge carried by a single proton or, equivalently, the magnitude of the negative electric charge carried by a single electron, which has charge −1 e. This elementary charge is a fundamental physical constant.
Conversion Factor: 1 e = 1.60217663 * 10^-19 C