Tools › Ohm's Law
Ohm's Law Calculator V • I • R • P
Enter any two known values. Leave the other two blank and hit Apply.
By clicking Apply, you acknowledge that results are for reference only and must be verified by a qualified electrician.
How to use
Enter any two known values and leave the others blank. The wheel shows all 12 formulas — the calculator picks the right one automatically.
Enter any two known values and leave the others blank. The wheel shows all 12 formulas — the calculator picks the right one automatically.
For reference only. Verify all results with the current NEC and local amendments. See Terms of Use.