LED Savings Calculator
Find out how much money you'll save by switching to LED bulbs. Enter your current bulbs and see your annual savings, payback period, and 10-year total savings, including bulb replacement costs.
Your Current Bulbs
Typical LED bulbs cost $2-5 each.
Your LED Savings
Annual Savings
$417.27
28 bulbs · 2608 kWh saved/year
Old Cost/yr
$491
LED Cost/yr
$73
You Save
$417/yr
Payback Period
$70.00 for 28 bulbs
2.0 mo
5-Year Savings
$2016
10-Year Savings
$4563
Environmental Impact
CO2 Saved/Year
2399 lbs
Energy Saved/Year
2608 kWh
Savings by Bulb Type
LED Buying Tips
- Dimmer compatibility: Look for "dimmable" on the package.
- Color temp: 2700K = warm white, 4000K = bright white.
- Match lumens, not watts: 60W incandescent = ~800 lumens.
- Buy multi-packs: Brings cost under $2/bulb.
How to Calculate LED Savings: Step-by-Step
Switching from traditional bulbs to LEDs is one of the easiest ways to cut electricity costs. Here is how to calculate your exact savings.
Step 1: Note the Current Bulb Wattage
Check the wattage of your existing bulbs. Common values: incandescent 40W, 60W, 75W, or 100W; halogen 35W to 75W; CFL 13W to 23W. Write down the wattage and count for each type you plan to replace.
Step 2: Find the LED Equivalent Wattage
LEDs use 75-85% less power than incandescent bulbs. Typical replacements: 40W incandescent = 6W LED, 60W = 9W LED, 75W = 12W LED, 100W = 15W LED. Match the lumen output (brightness) rather than wattage for proper replacement.
Step 3: Calculate the Wattage Difference per Bulb
Subtract the LED wattage from the old bulb wattage: 60W - 9W = 51W savings per bulb. This is the power reduction you get every hour the light is on.
Step 4: Calculate Annual Savings per Bulb
Multiply the wattage savings by daily hours and 365 days, then by your electricity rate: (51W / 1,000) x 5 hours x 365 x $0.15 = $13.95 per bulb per year. This is the savings from just one bulb replacement.
Step 5: Multiply by Total Number of Bulbs
Multiply the per-bulb savings by the total number of bulbs you are replacing. For 30 bulbs: $13.95 x 30 = $418.50 per year. Factor in the LED purchase cost to find the payback period, which is typically 2-4 months.
Formula
Annual Savings = (Old Watts - LED Watts) / 1,000 x Hours/Day x 365 x Rate x Number of Bulbs
Where: Old Watts = Current bulb wattage, LED Watts = Replacement LED wattage, Hours/Day = Average daily usage, Rate = Cost per kWh
Worked Example
Scenario: Replace 30 incandescent 60W bulbs with 9W LEDs, used 5 hours per day at $0.15/kWh.
- Step 1: Current bulbs: 30 x 60W incandescent
- Step 2: LED replacement: 9W each (same brightness at 800 lumens)
- Step 3: Savings per bulb: 60W - 9W = 51W
- Step 4: Annual savings per bulb: (51 / 1,000) x 5 x 365 x $0.15 = $13.95
- Step 5: Total annual savings: $13.95 x 30 = $418.50. LED cost: 30 x $3 = $90. Payback: about 2.6 months
Result: Replacing 30 bulbs saves $418.50 per year. The $90 LED investment pays for itself in under 3 months.
LED vs Incandescent vs CFL: Complete Comparison
This table shows the LED equivalent for common incandescent, halogen, and CFL bulbs, along with estimated annual savings per bulb at 5 hours/day usage and the US average electricity rate of $0.16/kWh.
| Old Bulb | Watts | LED Replacement | Lumens | Savings/Year | LED Lifespan |
|---|---|---|---|---|---|
| Incandescent | 40W | 6W LED | 450 | $4.96 | 25,000 hrs |
| Incandescent | 60W | 9W LED | 800 | $7.45 | 25,000 hrs |
| Incandescent | 75W | 11W LED | 1100 | $9.34 | 25,000 hrs |
| Incandescent | 100W | 15W LED | 1600 | $12.41 | 25,000 hrs |
| Halogen | 43W | 6W LED | 750 | $5.40 | 25,000 hrs |
| Halogen | 72W | 11W LED | 1100 | $8.90 | 25,000 hrs |
| CFL | 13W | 9W LED | 800 | $0.58 | 25,000 hrs |
| CFL | 23W | 15W LED | 1600 | $1.17 | 25,000 hrs |
Savings calculated at 5 hours/day, $0.16/kWh. Actual savings depend on your usage and local electricity rate. LED lifespan is rated at L70 (70% of original brightness). Incandescent bulbs last ~1,000 hours, halogens ~2,000 hours, CFLs ~8,000 hours.
Bulb Lifespan Comparison
One of the biggest advantages of LED bulbs is how long they last. Here's how each bulb type compares at 3 hours of daily use:
Frequently Asked Questions
How much money do LED bulbs save?
A single LED bulb saves $7-10 per year compared to an incandescent bulb, depending on usage and electricity rates. A typical home with 30 bulbs can save $200-300 per year by switching to LED. Over a 10-year lifespan, one LED bulb saves $75-125 when you factor in both energy savings and avoided bulb replacements.
Are LED bulbs worth it?
Yes, LED bulbs are one of the best energy investments for homeowners. They use 75-85% less electricity than incandescent bulbs and last 25 times longer. A $2-3 LED bulb typically pays for itself in 2-4 months through energy savings. Even compared to CFL bulbs, LEDs save money because they last 3x longer, contain no mercury, and turn on instantly.
How long does it take for LED bulbs to pay for themselves?
Most LED bulbs pay for themselves in 2-6 months. For example, replacing a 60W incandescent with a 9W LED saves about $0.60/month at average electricity rates. At $2.50 per bulb, that's a payback of about 4 months. After that, the savings are pure profit. Bulbs used more hours per day pay back even faster.
Do LED bulbs work with dimmer switches?
Many LED bulbs work with dimmers, but you need to check. Look for 'dimmable' on the packaging, since not all LEDs are dimmable. Also, older dimmer switches designed for incandescent bulbs may cause flickering with LEDs. If you experience flickering, you may need to upgrade to an LED-compatible dimmer switch (about $20-30), which is still a worthwhile investment given the energy savings.
What LED wattage replaces a 60-watt bulb?
A 9-watt LED bulb replaces a 60-watt incandescent bulb, and both produce about 800 lumens of light. Here are common replacements: 40W incandescent → 6W LED, 60W → 9W LED, 75W → 11W LED, 100W → 15W LED. When shopping for LEDs, match the lumens (brightness) rather than watts, since watts only measure energy use, not light output.
How long do LED bulbs last?
LED bulbs last approximately 25,000 hours, which is about 22 years at 3 hours per day of use. Compare this to incandescent bulbs (1,000 hours / ~1 year), halogen bulbs (2,000 hours / ~2 years), and CFL bulbs (8,000 hours / ~7 years). LED bulbs don't burn out suddenly like incandescents. Instead, they gradually dim over time, so you'll notice when it's time to replace them.
Are LED bulbs better than CFL?
Yes, LEDs are better than CFLs in most ways. LEDs use about 30% less energy than CFLs, last 3x longer (25,000 vs 8,000 hours), turn on instantly (no warm-up time), contain no mercury (CFLs do), work better in cold temperatures, and are available in more styles and color temperatures. The main advantage of CFLs is a slightly lower purchase price, but LEDs have become so affordable ($2-3 each) that the price difference is negligible.
Do LED bulbs save energy if left on all day?
LED bulbs are far more efficient than other bulbs when left on for extended periods. A 9W LED left on 24/7 costs about $1.05/month at average rates, compared to $6.90/month for a 60W incandescent. However, it's still best to turn off lights when not needed. Unlike CFLs, LEDs are not affected by frequent on/off switching, so there's no benefit to leaving them on.
What color temperature LED should I buy?
Color temperature is measured in Kelvin (K). For most homes: 2700K (warm white) closely matches incandescent bulbs, making it ideal for living rooms, bedrooms, and dining areas. 3000K (soft white) is slightly brighter and crisp, good for kitchens and bathrooms. 4000K (bright white) is energizing and great for garages, workshops, and home offices. 5000K+ (daylight) mimics natural sunlight and is best for reading areas and task lighting.
How much CO2 do LED bulbs save?
Each LED bulb that replaces a 60W incandescent saves about 47 kWh per year, which prevents roughly 43 pounds of CO2 emissions annually (based on the EPA average of 0.92 lbs CO2/kWh). A home switching 30 bulbs to LED prevents about 1,300 lbs of CO2 per year, equivalent to not driving about 1,500 miles. Over a 25,000-hour LED lifespan, that's over 7 tons of CO2 prevented per household.
How LED Savings Fit Into Your Total Electric Bill
Lighting accounts for about 9% of the average US home's electricity use. While that may sound small, it's one of the easiest and cheapest areas to improve. Switching 30 bulbs to LED costs $60-90 upfront but saves $200-300 per year, with a payback period of just a few months. To see how lighting fits into your overall energy costs, use our Electricity Bill Calculator for a full home energy breakdown.
Beyond lighting, the next biggest opportunity for savings is understanding which appliances cost the most to run. Space heaters, old refrigerators, and clothes dryers are common culprits. Use the Appliance Cost Calculator to check the running cost of any device in your home.
If you're planning a larger home upgrade, like adding an EV charger or upgrading your panel, you may want to verify your electrical panel has enough capacity. Our Whole House Load Calculator can help you check your panel's total load using the NEC 220.82 method.
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