Electric Field Calculator

Compute the electric field from a point charge using Coulomb's law

Inputs

Coulomb's law: E = k · |q| / r². Use SI units for the most accurate result. Distances must be in meters.

Charge Magnitude

Distance from Charge

Coulomb Constant k (N·m²/C²)

Default: 8.987551787 × 10⁹

Charge Sign

Distance is measured from the charge center to the evaluation point.
The direction arrow indicates whether the field radiates outward (positive charge) or inward (negative charge).
Use meters and coulombs when possible to avoid rounding issues.