โกCoulomb's Law Calculator
Find the electrostatic force between two point charges, or solve for charge or distance.
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Free Coulomb's Law Calculator
Working through an electrostatics problem? Our free Coulomb's law calculator finds the force between two point charges instantly. Enter both charges and the distance between them, and it calculates the electrostatic force โ telling you clearly whether it's attractive or repulsive based on the charge signs, not just a number.
Charges are often tiny, so the calculator supports microcoulombs, nanocoulombs, and scientific notation without losing precision. Every result comes with the formula shown, including Coulomb's constant, and the full substitution with your actual values, so you can follow the working or check your own answer.
Whether you're studying electrostatics for a physics class or verifying a circuit-adjacent calculation, this tool gives accurate results with clear reasoning. No sign-up, no downloads, no limits โ just fast, correct answers. See the About page or the FAQ for more.