Calculators
LED Retrofit Savings Calculator
Calculate annual energy and cost savings, payback period, ROI and carbon reduction from replacing fixtures with LEDs.
- Runs in your browser
- Nothing uploaded
The tool
Enter your numbers below. Results update as you type, and nothing leaves your browser.
Everything you enter stays on your own machine. Nothing is sent to us or to anyone else, which you can confirm in your browser network tab.
What people use it for
- Building a business case for lighting upgrades
- Comparing LED products
- Applying for utility rebates
- Sustainability reporting
About this tool
What the LED Retrofit Savings Calculator does
An LED retrofit saves the difference in wattage between old and new fixtures for every hour they run, plus maintenance savings because LEDs last much longer. Dividing the net project cost by the annual saving gives the payback period, which is often short for lights that run long hours.
Formula
- kWh saved = fixtures × (old watts − new watts) × hours ÷ 1,000
- Annual saving = kWh × price + maintenance saving
- Payback = (cost − rebates) ÷ annual saving
Worked example
Using the starting values in the calculator above:
| Input | Value |
|---|---|
| Fixtures | 200 |
| Existing watts per fixture | 64 |
| LED watts per fixture | 30 |
| Operating hours per year | 4,000 |
| Electricity price per kWh | $0.14 |
| Product and installation per fixture | $110 |
| Rebate per fixture | $15.00 |
| Annual maintenance saving | $400 |
| Grid emissions per kWh | 0.39 kg CO₂ |
| Result | Value |
|---|---|
| Annual saving | $4,208 |
| Payback period | 4.5 years |
| Energy saved per year | 27,200 |
| Net project cost | $19,000 |
| Simple annual return | 22.1% |
| CO₂ avoided per year | 10.6 |
How to read the result
Adding occupancy sensors or daylight dimming to the new fixtures reduces operating hours as well as wattage, often adding substantial extra savings.
Many utilities offer per-fixture rebates for commercial LED upgrades; apply before buying, as some require pre-approval.
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Questions
Questions about this tool
The things clients actually want to know — costs, timelines, ownership and what happens after launch.
Often 50% or more of lighting energy compared with fluorescent or halogen fixtures, plus lower maintenance.
Frequently one to three years for lights that run long hours in commercial buildings.
Your utility or national energy agency publishes average emission factors.
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