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Coulomb's law calculator
Enter two charges in microcoulombs and the distance between them to estimate the ideal electrostatic force.
Ideal model for point charges in a vacuum.
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Frequently asked questions
What is Coulomb's formula?
F = k|q₁q₂|/r².
What value do you use for k?
Approximately 8.9875517923 × 10⁹ N·m²/C².
How does it know if the force is attractive or repulsive?
Like charges repel and opposite charges attract.
What model does it use?
Ideal point charges in a vacuum.