LED vs Incandescent Savings Calculator

About the LED vs Incandescent Savings Calculator

Switching from incandescent to LED lighting is one of the simplest and most cost-effective energy upgrades you can make. An incandescent bulb converts only about 10% of its energy into light, wasting the rest as heat. LED bulbs use 75–80% less electricity for the same brightness and last 15–25 times longer.

A single 60-watt incandescent bulb replaced by a 9-watt LED saves roughly 51 watts every hour it's on. Over a year, that's about 93 kWh saved per bulb at 5 hours/day of use. Multiply by 30–40 bulbs in a typical home, and the savings add up to $150–$300 per year, depending on your electricity rate.

This calculator lets you compare the energy cost of running your existing incandescent, halogen, or CFL bulbs against LED replacements. Enter the wattage of both options, your daily usage hours, and electricity rate to see exact annual savings.

Integrating this calculation into regular energy reviews ensures that conservation strategies are grounded in measured data rather than assumptions about building performance and usage patterns.

When This Page Helps

LED bulbs cost more upfront but save money within months through reduced electricity consumption. This calculator quantifies the savings so you can see the payback period and lifetime value of switching. It works for any bulb comparison, not just incandescent vs LED.

How to Use the Inputs

1. Enter the wattage of your current (old) bulb.
2. Enter the wattage of the LED replacement bulb.
3. Enter the number of bulbs you plan to replace.
4. Enter hours of daily use.
5. Enter your electricity rate per kWh.
6. View the annual savings per bulb and total savings.

Example Calculation

Tips & Best Practices

• Match LED lumens (brightness) to incandescent equivalent, not wattage.
• A 9W LED ≈ 60W incandescent, 13W LED ≈ 100W incandescent.
• Choose warm white (2700K) LEDs for a similar light color to incandescent.
• LED bulbs last 15,000–25,000 hours vs 1,000 hours for incandescent — factor in replacement costs too.
• Start by replacing the most-used bulbs in your home for the fastest payback.
• Dimmable LEDs are available if you have dimmer switches — check compatibility.

The Economics of LED Lighting

LED technology has matured rapidly, with prices dropping over 90% in the past decade while performance continues to improve. Today, a quality LED bulb costs $2–$5 and pays for itself within months. For a whole-house upgrade of 30–40 bulbs, the investment of $60–$200 typically pays back within the first year.

Beyond Energy Savings

LEDs produce very little heat compared to incandescent bulbs, which convert 90% of energy to heat. In summer, this means less cooling load on your AC system — an indirect savings that compounds the direct energy reduction. LED bulbs also contain no mercury (unlike CFLs) and are fully recyclable.

Choosing the Right LED

Look for lumens (brightness) rather than watts when shopping. A 800-lumen LED replaces a 60W incandescent. Check the color temperature (2700K for warm, 5000K for daylight) and the CRI rating (80+ for residential use). For enclosed fixtures, choose LEDs rated for enclosed use to prevent overheating.

Frequently Asked Questions

• How much can I save by switching to LED?

  A typical household with 30 bulbs can save $150–$300 per year by switching all incandescent bulbs to LEDs. The exact savings depend on wattage differences, hours of use, number of bulbs, and your electricity rate.

• How long do LED bulbs last?

  Most LED bulbs last 15,000–25,000 hours, compared to 1,000 hours for incandescent and 8,000–10,000 hours for CFLs. At 5 hours/day, an LED bulb can last 8–14 years, virtually eliminating replacement costs.

• Are LED bulbs worth the higher price?

  Absolutely. While an LED costs $2–$5 vs $1 for an incandescent, the LED saves $8–$15/year in electricity and lasts 15–25 times longer. The payback period is typically 2–4 months, making LEDs one of the best energy investments.

• What about CFL bulbs vs LED?

  CFLs use about 25–30% more energy than LEDs and contain small amounts of mercury. LEDs also turn on quickly, work better with dimmers, and last 2–3 times longer than CFLs. The savings from CFL to LED are smaller but still worthwhile.

• Do LED bulbs work with dimmer switches?

  Not all LEDs are dimmable. Look for bulbs labeled "dimmable" and ensure your dimmer is LED-compatible. Older dimmers designed for incandescent bulbs may cause flickering or buzzing with LEDs. LED-rated dimmers solve this issue.

• Is the light quality the same?

  Modern LEDs offer excellent light quality across a range of color temperatures. Warm white (2700K) closely matches incandescent light. You can also choose daylight (5000K) or cool white (4000K) depending on preference. The CRI (Color Rendering Index) of good LEDs is 80–90+.