Online Tool Store
Electric Field Strength Calculator
Enter a point charge and distance to calculate the electric field strength at that point, using the standard Coulomb's law field formula. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example
Electric Field Strength Calculator
Sample: 5 μC charge, 0.2 m distance
Example shown — replace it with your own charge and distance.
Charge
5 μC
Distance
0.2 m
Result
How it works
- Enter the point charge's magnitude.
- Enter the distance from the charge.
- Get the electric field strength at that distance.
The method
Field strength is calculated with the standard point-charge formula, E = kQ/r², using Coulomb's constant.
FAQ
What formula does this use?
The point charge electric field formula, E = kQ/r², where k is Coulomb's constant, Q is the charge, and r is the distance from the charge.
What units should I use?
Enter charge in coulombs (or microcoulombs) and distance in meters — the result is given in newtons per coulomb (N/C), the standard unit for electric field strength.
Does this work for multiple charges?
This calculates the field from a single point charge; for multiple charges you'd need to vector-sum each charge's individual field contribution.
How we compare
| Feature | Online Tool Store | Physics textbook formula by hand | Simulation software |
|---|---|---|---|
| No software install | Yes | Yes | No |
| Quick to start | Yes | Slow | Setup required |
| Free to use | Yes | Free | Often paid |
For a quick homework or reference check without setting up simulation software, this gets you an instant number.