Coulombs to elementary charges

Type a value in coulombs to see it in elementary charges straight away, or type in the second box to convert back.

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How to use it

Type the value in the coulombs box.
Read the result in elementary charges as you type, and pick the precision you need.
Swap the direction to convert back, or copy the result.

e = C × 6.241509074e+18

Multiply the value in coulombs by 6.241509074e+18 to get elementary charges.

To convert 25 C to elementary charges: 25 × 6.241509074e+18 = 1.56038e+20 e.

Coulomb: The SI unit of charge: the charge carried by a current of one ampere in one second, so 1 C = 1 A·s.
Elementary charge: The magnitude of the charge on one proton, or one electron with a negative sign, exactly 1.602176634 × 10^-19 C since the 2019 SI definition.

Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
Both unit factors are exact by their official definitions.

How many elementary charges are in one coulomb?

1 C = 6.24151e+18 e exactly.

How do I convert coulombs to elementary charges?

Use e = C × 6.241509074e+18. For example, 25 C = 1.56038e+20 e.

How many coulombs are in one elementary charge?

1 e = 1.60218e-19 C.

How do I convert battery mAh to watt-hours?

You need the battery voltage: Wh equals mAh times volts divided by 1000. A 5000 mAh battery at 3.7 V holds 18.5 Wh.

How many coulombs are in an ampere-hour?

Exactly 3600 coulombs, because an ampere-hour is one ampere flowing for 3600 seconds.