About the Coulomb's Law Calculator
Electrostatic force between two point charges, with the electric field at that distance.
Also known as: electrostatic force, charge force calculator, coulomb force.
How to use this calculator
- Enter charge 1, charge 2, distance.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
F = k·q₁·q₂ / r², k = 8.99 × 10⁹ N·m²/C²
Worked example
Using the values pre-filled in the calculator above:
- Charge 1 = 0.000001 C
- Charge 2 = 0.000002 C
- Distance = 0.1 m
the calculator returns:
- Force: 1.79751 N
- Type: Repulsive (like charges)
- Electric field from charge 1: 898,755.1792 N/C
- Force at double distance: 0.449378 N