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.
Quick Reference
V = I × R • I = V / R • R = V / I
P = V × I • P = I² × R • P = V² / R
V = I × R • I = V / R • R = V / I
P = V × I • P = I² × R • P = V² / R
For reference only. Verify all results with the current NEC and local amendments. See Terms of Use.