Electric Field Calculator

An electric field is a region around a charged particle where another charge experiences a force. Described by Coulomb's Law, the field strength E at distance r from a point charge Q is E = kQ/r²

The calculator uses the standard published formula for electric field is a region around a charged particle where another charge experiences a force. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches, square metres. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: E = kQ / r² where k = 8.99 × 10⁹ N⋅m²/C² (Coulomb's constant). Each step in the calculation is shown so you can verify the result manually.