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 works right here on your device — nothing gets sent out.
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.