basic

LED vs Incandescent Bulb Annual Savings Calculator

Δkwh = (W_inc − W_led) · hrs · days / 1000; savings = Δkwh × rate.

Compute the yearly energy and dollar savings from replacing an incandescent bulb with an equivalent-output LED. Inputs: incandescent watts, LED watts, daily hours of use, days of use per year, and electricity rate.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

W
W
h
$ / kWh

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

kWh saved = (W_inc − W_led) · hours · days / 1000; $ saved = kWh · rate.

In depth

Compute the yearly energy and dollar savings from replacing an incandescent bulb with an equivalent-output LED. Inputs: incandescent watts, LED watts, daily hours of use, days of use per year, and electricity rate.