Ohm's Law Calculator

Solve for voltage, current, resistance, or power — enter any two values and calculate the rest with formula visualization.

Ohm's Law Solver

Select mode and enter values

V
A
Ω
W
Voltage
V
Current
A
Resistance
Ω
Power
W

Select a mode above, enter the known values, and tap Calculate to solve.

Formula Wheel
OHM'S LAW V I × R P / I √(P×R) I V / R P / V √(P/R) R V / I V² / P P / I² P V × I I² × R V² / R
Step-by-step Solution
Simple Circuit
V R (Ω) → I (Current flow)