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Ω Ohm's Law Calculator

Enter any two values to solve for Voltage, Current, Resistance & Power

V = I × R V = P / I I = V / R R = V / I P = V × I P = I² × R OHM

Enter any 2 known values (leave others blank)

Volts (V)
Amperes (A)
Ohms (Ω)
Watts (W)
Enter any two values above — the other two will be solved automatically

📐 Formula Reference

V = I × R | I = V / R | R = V / I

P = V × I | P = I² × R | P = V² / R

Use mA for milliamps (e.g. 0.02 A = 20 mA). Power is always in Watts.