Lighting, LEDs & Electrical Fixtures calculator

LED Retrofit Payback Period Calculator

LED retrofit payback tells you how many years it takes for the combined energy and maintenance savings of a lighting upgrade to repay the project cost. Energy managers, facilities directors, and ESCO project developers use it as the first gate on any retrofit proposal and to compare it against rebate-driven alternatives. Because LED projects save on both the meter and the maintenance ladder — fewer relamps, fewer ballast swaps — leaving maintenance savings out understates the return. The five-year net value alongside the payback period shows whether the project actually creates value within a typical budget horizon.

What this calculator does

  • Calculate the simple payback period for an LED retrofit project by comparing total upfront investment against net annual savings from energy reduction and maintenance cost avoidance. Also shows 5-year net value.
  • Use this when preparing a lighting retrofit proposal, justifying the capital cost of an LED upgrade to facility management or finance, comparing different LED product options by payback, or responding to a customer asking how long before the investment pays for itself.
  • It computes the simple payback period and five-year net value of a lighting retrofit from its cost and combined annual savings.

Formula used

  • Net annual savings = annual energy savings + annual maintenance savings
  • Payback period = total investment / net annual savings
  • 5-year net value = (net annual savings x 5) - total investment

Inputs explained

  • Total retrofit investment:
  • Annual energy savings:
  • Annual maintenance cost savings:

How to use the result

  • Use it to screen a retrofit proposal, compare projects competing for capital, or build the savings case for a rebate application.
  • Simple payback ignores the time value of money, rate escalation, and LED degradation, so use it as a screen, not a final financial model for long-horizon projects.

Current U.S. benchmarks

  • The producer price index for copper and brass mill shapes stands at 559.593 (BLS, May 2026), up 76.8% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,484 per tonne (IMF via FRED, May 2026).
  • Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.
  • The U.S. has 5,397 electrical equipment and appliances establishments employing about 369,437 workers (Census County Business Patterns, 2023).

Common questions

  • How do you calculate LED retrofit payback? Add annual energy and maintenance savings, then divide the total investment by that sum. With $18,000 invested and $3,100/yr saved, payback is 5.81 years.
  • What is a good payback period for an LED retrofit? Most facilities target under 3 years; under 2 with utility rebates. At 5.81 years, this project is slow — worth revisiting the rate, run hours, or rebate eligibility before approving.
  • Why is the five-year net value negative here? Because payback exceeds five years. $3,100/yr over five years is $15,500, which is $2,500 short of the $18,000 investment, so the project hasn't broken even by year five.
  • Should maintenance savings be included in payback? Yes. Avoided relamps, ballast replacements, and lift truck labor are real savings. Omitting them can stretch a 3-year payback to 5 years and kill a viable project on paper.
  • Simple payback vs. ROI — which should I use? Simple payback is fastest for screening. For capital approval on a long-lived LED system, follow up with NPV or IRR that account for rate escalation and the time value of money.

Last reviewed 2026-05-12.