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Ohm's Law Calculator
Enter any two values to calculate the other two instantly.
Voltage (V)
Current (A)
Resistance (Ω)
Power (W)
Enter any 2 of the 4 values above
Calculated values — Calculated from:
V+I
Voltage
240
V
Current
15
A
Resistance
16
Ω
Power
3600
W
Key Formulas
V = I × R
I = V / R
R = V / I
P = V × I
P = I² × R
P = V² / R