About the Coulomb's Law Calculator
Solves F = kq₁q₂/r² for any missing quantity.
What it is
Enter any three of force, charge q₁, charge q₂, and distance r, and the calculator solves for the fourth using Coulomb's law, classifying the resulting force as attractive or repulsive.
Features
Solve for any variable
Force, either charge, or distance.
Attractive/repulsive
Classified from the signs of both charges.
Unit support
Charge in C, mC, µC, nC; distance in m, cm, mm.
Step-by-step working
Formula shown with full substitution.