Electric Field Strength Calculator
Enter charge in coulombs, distance in metres, and an optional relative permittivity to calculate E = kQ/(εr²).
A QUICK WALKTHROUGH
How to use this tool
- Enter a point charge and positive distance.
- Enter relative permittivity for the medium.
- Review the field magnitude in newtons per coulomb.
Point-charge scope
This is the ideal electrostatic point-charge equation. It does not model charge distributions, superposition, time-varying fields, or electrical safety and design requirements.
GOOD TO KNOW
Common questions
Can I enter a negative charge?
Yes. The signed result indicates field direction relative to the chosen radial convention.
Does it support multiple charges?
No. Use one point charge at a time.