About This Tool
The LED Savings Calculator shows how much money you can save by switching from incandescent or CFL bulbs to energy-efficient LEDs. Lighting accounts for about 10-15% of a typical home's electricity bill, and LEDs use up to 80% less energy while lasting 15-25 times longer. This tool compares the cost of running your current bulbs versus LED replacements, factoring in wattage, hours of use, bulb count, and electricity rate. It's great for homeowners planning a full lighting upgrade, renters looking to lower bills, or businesses retrofitting offices. You'll see both annual savings and long-term savings over the LED's lifespan. Many users are surprised how quickly the switch pays for itself.
How It Works
The calculator uses the formula: Savings = (Old bulb wattage - New bulb wattage) / 1000 × Hours used per year × Cost per kWh × Number of bulbs. For example, replacing a 60 W incandescent with a 10 W LED (50 W saved), used 5 hours/day (1,825 hours/year) at $0.12/kWh: (50/1000) × 1,825 × 0.12 = $10.95 per bulb per year. For 10 bulbs, annual savings = $109.50.
Examples
- Example 1: Replacing 15 incandescent bulbs (60 W each) with 9 W LEDs, used 4 hours/day. Annual savings per bulb: (51/1000) × 1,460 × $0.13 = $9.68. Total for 15 bulbs: $145.20/year.
- Example 2: Replacing 5 CFL bulbs (14 W each) with 7 W LEDs, used 6 hours/day. Annual savings per bulb: (7/1000) × 2,190 × $0.11 = $1.69. Total for 5 bulbs: $8.45/year.
Pro Tips
- Match lumens (brightness) not wattage: a 10 W LED (800 lumens) equals a 60 W incandescent—use the same lumen output for a fair comparison.
- Include bulb replacement costs: LEDs last 25,000+ hours, while incandescents last 1,000 hours, so factor in buying fewer bulbs over time.
- Consider dimmable or smart LEDs if you use dimmers—they save additional energy when dimmed, unlike old bulbs.