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Electric Power Dissipation P = I²R = V²/R Calculator

Heat dissipated by an ohmic resistor at steady state.

Compute the steady-state power dissipated by an ohmic resistor — choose to feed in current and resistance (P = I²R), voltage and resistance (P = V²/R), or voltage and current (P = V·I). Reports the corresponding heat rate in watts and BTU/h.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

A
Ω
V

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

P = I²·R = V²/R = V·I (Joule heating).

In depth

Compute the steady-state power dissipated by an ohmic resistor — choose to feed in current and resistance (P = I²R), voltage and resistance (P = V²/R), or voltage and current (P = V·I). Reports the corresponding heat rate in watts and BTU/h.