Light Bulb Savings Calculator
Calculate how much money you save by switching from incandescent or CFL bulbs to LED, based on wattage, usage, and electricity rate.
Annual Savings
Light bulb savings are calculated by comparing energy consumption between old and new bulbs.
Annual kWh = Watts x Hours/Day x 365 / 1000
Annual Cost = Annual kWh x Electricity Rate
Savings = Old Bulb Cost - New Bulb Cost
Common equivalents (lumens):
| Incandescent | CFL | LED | Lumens |
|---|---|---|---|
| 40W | 9W | 6W | ~450 |
| 60W | 13W | 8W | ~800 |
| 75W | 18W | 11W | ~1,100 |
| 100W | 23W | 14W | ~1,600 |
LED advantages:
- Use 75-80% less energy than incandescent
- Last 15,000-25,000 hours vs 1,000 hours
- Pay for themselves in 3-6 months