Elementary Charge to Coulombs Converter
Convert elementary charge to coulomb instantly. 1 e = 1.602177e-19 C, worked steps and a full reference table.
How to use it
- Type the value in elementary charge — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 e | 1.602177e-19 C |
| 5 e | 8.010883e-19 C |
| 10 e | 1.602177e-18 C |
| 100 e | 1.602177e-17 C |
One elementary charge equals 1.6022e-19 coulombs (C). To convert elementary charges to coulombs, multiply by 1.6022e-19; to go back the other way, multiply by 6.2415e+18 instead.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
What elementary charges and coulombs actually measure
Elementary charge (e) — The elementary charge is the charge on a single proton, 1.602 × 10⁻¹⁹ coulombs. Atomic physics and semiconductor theory.
Coulomb (C) — The coulomb is the SI unit of charge — one amp flowing for one second. Physics and electrical theory.
Elementary Charge to Coulombs conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| e | C |
|---|---|
| 1 e | 1.6022e-19 C |
| 2 e | 3.2044e-19 C |
| 5 e | 8.0109e-19 C |
| 10 e | 1.6022e-18 C |
| 25 e | 4.0054e-18 C |
| 50 e | 8.0109e-18 C |
| 100 e | 1.6022e-17 C |
How to convert elementary charges to coulombs by hand
Multiply the number of elementary charges by 1.6022e-19.
For example, 25 e × 1.6022e-19 = 4.0054e-18 C.
Going the other way, divide by 1.6022e-19 — or multiply by 6.2415e+18, which is the same thing and easier to do in your head.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many C are in 1 e?
1 e equals exactly 1.602177e-19 C. Multiply any value in elementary charge by 1.602177e-19 to get coulomb.
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026