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 in 2024).
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.
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Frequently Asked Questions
Advanced 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.
Advanced 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.
Advanced 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.
Advanced 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.
Advanced 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 $4 LED pays back in ~18 months. The longer payback still makes sense — LEDs will last 40+ years at that usage rate, far exceeding the replacement cost many times over.
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Formula & Methodology
Annual Energy Cost
Annual Cost = (Watts ÷ 1,000) × Hours per Day × 365 × Electricity Rate ($/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.
Watt (W)A unit of electrical power. Lower wattage means less energy consumed. A 9W LED produces the same light as a 60W incandescent — 85% less energy.
Lumen (lm)The unit of visible light output (brightness). LEDs achieve 80–100 lumens per watt vs 10–17 for incandescents. Match lumens, not watts, when shopping.
kWh (Kilowatt-hour)The billing unit for electricity. Running a 1,000W appliance for 1 hour uses 1 kWh. US average cost: ~$0.16/kWh (2024).
CRI (Color Rendering Index)Measures how accurately a light source renders colors vs. natural sunlight (0–100 scale). 90+ is excellent for home use; look for 80+ minimum.
Color Temperature (Kelvin)2,700K = warm white (like incandescent). 3,000K–3,500K = neutral white. 4,000K+ = cool/daylight (task areas, garages).
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Real-World Examples
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Replacing 10 Living Room Bulbs
10 × 60W → 10 × 9W LED at $4 each. 5 hrs/day, $0.14/kWh. Old annual energy cost: $153.30. LED annual: $22.99.
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.
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Bulb Type Comparison (60W Equivalent)
Bulb Type
Watts
Lumens
Annual Cost*
Lifespan
Annual Savings vs Inc.
Incandescent
60W
800 lm
$26.28
1,000 hrs
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Halogen
43W
800 lm
$18.85
2,000 hrs
$7.43
CFL
14W
800 lm
$6.13
8,000 hrs
$20.15
LED
9W
800 lm
$3.94
25,000 hrs
$22.34
*Annual cost at $0.14/kWh, 5 hrs/day, includes prorated bulb replacement cost.