basic

Electric Field from a Point Charge at a Given Distance Calculator

E = kq / r²; k = 8.99×10⁹ N·m²·C⁻².

Compute the magnitude of the electric field E due to a point charge q at distance r: E = kq/r², with k = 8.98755×10⁹ N·m²/C² (Coulomb constant). Also reports the electrostatic force on a test charge q₀ placed at that point: F = qE.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

C
m
C

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

E = kq / r²; F = q₀E.

In depth

Compute the magnitude of the electric field E due to a point charge q at distance r: E = kq/r², with k = 8.98755×10⁹ N·m²/C² (Coulomb constant). Also reports the electrostatic force on a test charge q₀ placed at that point: F = qE.