LED Savings Calculator
Calculate how much money you save by switching from incandescent or CFL bulbs to LEDs.
Running a 100W appliance 4 hours/day costs approximately $2/month at $0.13/kWh.
Why This Calculation Matters
The LED Savings Calculator helps you screen a energy efficiency investment before spending serious money on a formal quote. It captures the core economics; to finalize a decision, combine these numbers with installer-specific proposals, tax credits, and utility rate plans.
How to Use This Calculator
- Enter your values in the input fields, each one has a label and help text explaining what to type.
- Results appear instantly as you type; there's no "calculate" button to press.
- Change any input to compare scenarios side by side.
All math happens in your browser. Nothing you type is sent to a server, saved, or shared.
Beyond the Calculator
Real-world performance depends on local climate, shading, equipment efficiency, and rate structure. Use this number as a screen, then get 2-3 installer quotes for the definitive answer.
LED vs. Incandescent
A 10W LED replaces a 60W incandescent, using 83% less energy.
Cost Comparison (per bulb, 3 hrs/day for 10 years)
- Incandescent (60W): ~$79 in electricity + $15 in bulbs = $94
- CFL (13W): ~$17 in electricity + $6 in bulbs = $23
- LED (10W): ~$13 in electricity + $5 in bulbs = $18
Switching 20 bulbs saves about $1,500 over 10 years.
When to Use This Calculator
- Screen a solar, battery, or EV investment for payback period.
- Model what-if scenarios as utility rates, tax credits, or panel costs change.
- Compare vendor proposals on a consistent basis.
Limitations & Common Mistakes
- Actual system output depends on shading, panel orientation, local weather, and equipment losses.
- Tax credits and utility rate plans change, verify with your installer and utility provider.
- Payback calculations ignore financing costs and opportunity cost of capital.
Frequently Asked Questions
Does this include tax credits and rebates?
Use the input fields for any incentives that apply to you. Federal, state, and utility incentives change often, verify current programs with your installer and local utility.
Is this calculator free to use?
Yes. The LED Savings Calculator is free, requires no signup, and runs entirely in your browser, your inputs are never sent to a server.
How often is this calculator updated?
Formulas are reviewed against authoritative sources, and any rate or price data is refreshed on an automated schedule. Check the "as of" date on any live data panel for the most recent refresh.
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