Coulomb's Law Calculator
Electrostatic force between two point charges and the electric field of the first charge.
How to use the Coulomb's Law Calculator
- Enter or select: Charge q₁, Charge q₂, Distance r, Relative permittivity εr.
- The results (Force magnitude, Type, Field of q₁ at r) are calculated instantly as you type.
- Use “Copy link” to share the calculation with the same input values.
Formula
- F = k·q₁q₂/r², k = 1/(4πε₀εr) ≈ 8.988 × 10⁹ N·m²/C²