electrical calculator
Ohm's Law Calculator
Solve for voltage, current, resistance, or power — enter any two values and the other two are calculated.
How it works
V = I x R and P = V x I. Enter any two of the four; the remaining two are solved.
Worked example
120 V across 60 ohms: I = 120 / 60 = 2 A, P = 120 x 2 = 240 W.
When to use it
- Enter exactly two of the four fields; the calculator fills in the rest.
- P = I squared x R = V squared / R are equivalent power forms.