Elementary charges to coulombs
Type a value in elementary charges to see it in coulombs straight away, or type in the second box to convert back.
Loading the tool…
Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the elementary charges box.
- Read the result in coulombs as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
C = e × 1.602176634e-19
Multiply the value in elementary charges by 1.602176634e-19 to get coulombs.
Example
To convert 25 e to coulombs: 25 × 1.602176634e-19 = 4.00544e-18 C.
Conversion table
| Elementary charges (e) | Coulombs (C) |
|---|---|
| 1 | 1.60218e-19 |
| 2 | 3.20435e-19 |
| 3 | 4.80653e-19 |
| 5 | 8.01088e-19 |
| 10 | 1.60218e-18 |
| 20 | 3.20435e-18 |
| 25 | 4.00544e-18 |
| 50 | 8.01088e-18 |
| 100 | 1.60218e-17 |
| 250 | 4.00544e-17 |
| 500 | 8.01088e-17 |
| 1,000 | 1.60218e-16 |
About the units
- 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.
- Coulomb
- The SI unit of charge: the charge carried by a current of one ampere in one second, so 1 C = 1 A·s.
Limits and caveats
- 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.
Questions about this tool
How many coulombs are in one elementary charge?
1 e = 1.60218e-19 C exactly.
How do I convert elementary charges to coulombs?
Use C = e × 1.602176634e-19. For example, 25 e = 4.00544e-18 C.
How many elementary charges are in one coulomb?
1 C = 6.24151e+18 e.
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.