Discover exactly how much switching to LED bulbs saves on electricity, replacements, and CO₂ — with a full 10-year projection and home-by-room breakdown.
Quick Bulb Presets
Usage & Electricity
LED Bulb Settings
Incandescent Settings
Annual Savings
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Enter your details to calculate
Energy Saved = (Inc − LED) W/1000 × hrs × 365 × rateBulb Savings = Inc replacements/yr × $1.50 − LED replacements × costPayback = LED Upfront ÷ Annual Savings
kWh Saved / Year
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Energy Cost Saved
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Bulb Cost Saved
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Total Annual Savings
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Payback Period
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10-Year Net Savings
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Annual
Rate Scenarios
How your savings change at low, average, and high electricity rates.
Bulb Type Comparison (60W Equivalent)
Per-bulb annual costs at your electricity rate and 5 hrs/day usage.
Bulb Type
Watts
Lifespan
Annual Energy
Annual Bulb
Total / yr
vs LED
Annual Savings Sensitivity Matrix
Annual savings at different bulb counts and daily usage hours. Your current inputs are highlighted.
Bulbs \ Hours
2 hrs
3 hrs
5 hrs
8 hrs
12 hrs
Whole-Home Savings Planner
Edit bulb counts and hours per room. Totals update instantly. Uses your electricity rate from Tab 1.
Room
Bulbs
Hrs/Day
Annual LED Cost
Annual Inc. Cost
Annual Savings
Total Home Annual Savings
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How to Use This Calculator
1
Pick a Bulb Preset
Select the wattage equivalent you're replacing (40W, 60W, 75W, or 100W) or choose Custom to enter any wattage. All LED settings auto-fill.
2
Set Usage & Rate
Enter how many bulbs you're switching, daily hours of use, and your electricity rate. Find your rate on your utility bill (US avg: $0.16/kWh).
3
Explore Your Savings
See annual savings, payback period, and 10-year ROI instantly. Use Scenario Analysis for rate comparisons and Home Planner for room-by-room totals.
Formula & Methodology
Annual Energy Cost
Annual Cost = (Watts ÷ 1,000) × Hours per Day × 365 × Electricity Rate ($/kWh)
Converts watts to kilowatt-hours, then multiplies by annual hours and utility cost. Example: a 60W bulb at 5 hrs/day at $0.14/kWh costs $15.33/year.
Calculates how many bulbs you burn through per year times the cost each. An incandescent lasting 1,000 hours at 5 hrs/day burns out every 200 days — roughly 1.83 per year.
Payback Period
Payback = LED Upfront Cost ÷ Total Annual Savings
Divides the upfront LED investment by total annual savings (energy + bulb replacement). At current prices, most households see payback within 3–6 months.
*Annual cost at $0.14/kWh, 5 hrs/day, includes prorated bulb replacement cost.
The Complete Guide to Switching to LED Lighting
Why LED Bulbs Are Worth Every Penny
LED bulbs use 75–80% less energy than incandescent bulbs and last 25 times longer. A single LED that replaces a 60W incandescent saves approximately $130 in electricity over its lifetime at average US rates. The Department of Energy estimates that widespread LED adoption saves about 569 TWh of electricity annually — equivalent to the output of ~92 power plants.
Choosing the Right LED
Match lumens (not watts) when replacing bulbs: 800 lumens replaces 60W incandescent, 1,100 lumens replaces 75W, 1,600 lumens replaces 100W. Choose color temperature based on room use: 2,700K–3,000K for bedrooms and living rooms (warm, relaxing), 3,500K–4,100K for kitchens and bathrooms (neutral, task-friendly), 5,000K+ for garages and workshops. Look for ENERGY STAR certification and CRI 90+ for best quality.
Smart LEDs: Worth the Premium?
Smart LED bulbs (Philips Hue, LIFX, Kasa) cost $15–40 each but add scheduling, dimming, and color control. The energy savings from automated scheduling — turning off lights when rooms are empty, dimming based on time of day — can cut lighting electricity use by an additional 20–40%. For frequently occupied rooms with existing smart home systems, smart LEDs deliver both convenience and real energy savings that help offset the premium within 2–3 years.
Frequently Asked Questions
How much energy do LEDs really save vs incandescent?
LEDs use roughly 75–80% less energy than incandescent bulbs to produce the same light. A standard 60W incandescent equivalent uses only 8–10W as an LED. For a household running 20 bulbs 5 hours a day, that typically saves $100–$200 per year in electricity alone, depending on your utility rate.
Why is LED lifespan so much longer than incandescent?
Incandescent bulbs work by heating a tungsten filament until it glows, which gradually burns out after about 1,000 hours. LEDs produce light through electroluminescence with no filament, generating far less heat. Quality LEDs last 15,000–25,000 hours — 15 to 25 times longer — meaning far fewer replacements and less landfill waste.
Is the upfront cost of LEDs worth it?
Almost always yes. While LEDs cost more upfront ($3–8 vs ~$1 for incandescent), they typically pay back in under 1 year on energy savings alone for bulbs used 5+ hours daily. Over 10 years, a single LED saves $15–$30 vs an incandescent, even after accounting for the higher purchase price. Payback is typically 3–6 months for frequently used bulbs.
Are incandescent bulbs still available?
Traditional incandescent bulbs (40W, 60W, 75W, 100W A-type) were phased out in the U.S. as of August 2023 under DOE efficiency standards. Specialty incandescents (3-way, appliance, colored) may still be sold. If you still have incandescents, replacing them with LEDs is one of the fastest-payback home upgrades available.
Do LEDs save money even for lights used only 1–2 hours a day?
Yes, but payback takes longer. For a bulb used 1 hour/day at $0.14/kWh, switching 60W to 9W LED saves about $2.60/year in energy. The $4 LED pays back in ~18 months. The longer payback still makes sense — LEDs will last 40+ years at that usage rate, far exceeding the replacement cost many times over.