Ohm's Law calculator

Calculate any electrical variable with Ohm's Law (V=IR).

What do you want to calculate?

Current (Amperes)

Resistance (Ohms)

What is Ohm's Law?

Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R): V = I × R. It also allows calculating power: P = V × I. It's fundamental in electronics and electrical engineering. Derived formulas: I = V/R and R = V/I.