LED Light Bulb Savings Calculator
Compare existing bulbs with LED replacements and estimate annual electricity and payback savings.
Calculate LED upgrade savings
How this calculator works
LED savings come from reducing watts while providing a similar useful light output. Compare lumens, color temperature, dimmer compatibility, and fixture restrictions—not wattage alone—when selecting replacements.
Simple payback divides purchase cost by annual electricity savings. It excludes replacement labor, bulb life, cooling effects, rebates, and financing.
Replacing twelve 60-watt bulbs with 9-watt LEDs used four hours daily saves about 894 kWh and $161 per year at $0.18/kWh.
How to get a more accurate estimate
- Match lumens and light quality before comparing watts.
- Prioritize bulbs with the longest daily runtime.
- Check enclosed-fixture and dimmer compatibility to protect bulb life.
Frequently asked questions
Should I replace working LEDs?
Usually no. This calculator is most useful for incandescent, halogen, or inefficient specialty bulbs.
Why compare lumens?
Lumens measure light output; wattage measures electrical input. Similar lumens make the savings comparison more meaningful.
Does the payback include bulb life?
No. It is electricity-only simple payback, so longer life can be an additional benefit.
Results use the values you enter and the formula shown above. Real bills can include taxes, minimum charges, tiers, time-of-use pricing, cycling losses, and other adjustments. Use a recent bill or a plug-in energy meter when accuracy matters.