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Ohm's Law Calculator
Enter any two values — the remaining voltage, current, resistance and power update instantly.
Formula
V = I·R | I = V/R | R = V/I | P = V·I = I²·R = V²/R
Example
230 V across a 115 Ω heater: I = 2 A, P = 460 W.
FAQ
What does the calculator do with three inputs?
It takes any two and computes the rest — editing a third value recalculates the pair you did not type.
Does Ohm's law always apply?
Only for ohmic (linear) components. Diodes, transistors and filaments (resistance changes with temperature) deviate from it.