basic

Electric Field from a Point Charge Calculator

E = k · |Q| / r² at distance r from a point charge.

Compute the magnitude of the electric field a distance r from a point charge Q, using Coulomb's constant k = 8.988 × 10⁹ N·m²/C²: E = k · |Q| / r². Reports the force on a 1-coulomb test charge.

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

Inputs

µC
m

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 = k · |Q| / r², k = 8.988 × 10⁹ N·m²/C².

In depth

Compute the magnitude of the electric field a distance r from a point charge Q, using Coulomb's constant k = 8.988 × 10⁹ N·m²/C²: E = k · |Q| / r². Reports the force on a 1-coulomb test charge.