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True Trade Path

Ohm's Law Calculator

Solve for volts, amps, ohms or watts from any two known values.

Circuit type
V
A
Ω
W

Enter any two values. The rest are calculated.

Waiting for inputs

Enter any two values above and the remaining two are solved instantly.

What this assumes

  • Direct current, or alternating current at unity power factor.
  • Resistance is treated as constant and purely resistive.
  • For AC circuits with motors or electronics, apply the power factor separately.

Important

Circuit calculations do not replace a design review. Installed work must comply with the National Electrical Code as adopted and amended by your jurisdiction.