Ohm's Law Calculator
Enter any two known electrical values and calculate the remaining values.
Voltage
—
V
Current
—
A
Resistance
—
Ω
Power
—
W
V = I × R |
I = V ÷ R |
R = V ÷ I |
P = V × I
Motor Current Calculator
Estimate single-phase or three-phase motor operating current.
Estimated Current
—
A
Mechanical Output
—
kW
Estimated Input Power
—
kW
Three-phase current:
I = P ÷ (√3 × V × PF × Efficiency)
Note: This calculator provides an estimated operating current
based on electrical relationships. Motor nameplate current and NEC full-load
current values should be used where required for conductor, overload,
short-circuit, and overcurrent protection calculations.