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LED Bulb Retrofit Payback Period Calculator

Payback = upgrade cost / annual electricity savings.

Estimates the simple payback period in months for replacing incandescent or CFL bulbs with LED bulbs from wattage difference, usage hours, and electricity rate.

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Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

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

Annual savings = (W_old − W_led) × hours/day × 365 × $/kWh / 1000

In depth

Estimates the simple payback period in months for replacing incandescent or CFL bulbs with LED bulbs from wattage difference, usage hours, and electricity rate.