Calculation details
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Use this result
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What does this calculator estimate?
An LED savings calculator shows how much swapping bulbs saves. Enter the old and new wattage, daily hours, and your rate to see the yearly savings.
- Savings = wattage cut × hours × rate
- 60W → 9W saves ~$8.38/yr per bulb at 3 hrs/day
- LEDs also last ~15–25× longer
Why LED swaps pay off
LEDs use 75–85% less energy than incandescents for the same light, and last far longer. The savings calculator converts the wattage difference into dollars per bulb per year — then multiply by your bulbs for the household total.
Limitations to watch for
The estimate assumes constant on-time and your rate; dimming and smart features add cost. Bulb replacement cost isn't subtracted — though LEDs' 15–25× lifespan more than covers it. The tool models one bulb; scale by your count.
How to use it in practice
Check the wattage on your current bulbs and the LED equivalent (a 9 W LED replaces a 60 W incandescent). Enter daily hours and your rate. Multiply the per-bulb savings by every bulb you swap — the bigger the household, the bigger the win.
['Enter the old and new bulb wattage.', 'Enter hours per day and your rate.', 'Read yearly savings per bulb, then scale by bulb count.']
The savings formula
Per-bulb savings = (old watts − LED watts) × hours × rate ÷ 1,000 × days. A 60-watt bulb swapped for a 9-watt LED at 3 hours daily and $0.15/kWh saves 51 watts × 3 × 0.15 ÷ 1,000 × 365 ≈ $8.38 per year per bulb.
Why LEDs win so clearly
LEDs produce the same light with roughly 85 percent less power, and they last 15,000 to 25,000 hours versus 1,000 for incandescents. The bulb cost difference is recovered within the first year of typical use — after that, the savings are pure. The calculator shows the payback explicitly.
Whole-house scaling
A home with 30 bulbs swapped saves about $250 per year at typical usage — roughly $2,500 over a decade. The calculator scales from per-bulb to per-house when you enter the number of bulbs.
Not all LEDs are equal
Lumens (brightness), not watts, are the comparable measure; a 9-watt LED and a 60-watt incandescent both emit about 800 lumens. Colder color temperatures and dimming compatibility vary by model. The calculator compares power, not light quality — match lumens when you shop.
A worked example
A kitchen with five 60-watt bulbs on 4 hours daily at $0.15/kWh: 5 × 51W × 4h × 0.15 ÷ 1000 × 365 = about $55.85 per year saved. At $2 per LED, the bulbs pay for themselves in about two months. The calculator runs this for any room.
How this calculator works
Formula
Savings = (old wattage − LED wattage) ÷ 1,000 × hours per day × electricity rate × days. The tool compares bulbs and shows yearly savings per bulb.
Worked example
Swapping a 60 W incandescent for a 9 W LED, 3 hours a day at $0.15/kWh: saves ~$8.38 per bulb per year.
Assumptions to verify
- The LED produces equivalent light at lower wattage.
- Usage is constant daily.
- The electricity rate is per kWh as entered.
Frequently asked questions
How much does an LED save?
Wattage cut × hours × rate: 60W → 9W at 3 hrs/day, $0.15/kWh saves ~$8.38 per bulb per year.
How do I calculate LED savings?
((old W − new W) ÷ 1000) × hours × rate × 365.
What LED replaces a 60 W bulb?
About a 9 W LED (roughly 800 lumens) — same light, 85% less energy.
Do LEDs really last longer?
Yes — 15,000–25,000 hours vs ~1,000 for incandescents, meaning years instead of months.
Is the upfront cost worth it?
Usually — the energy savings often pay back the bulb's cost within months, and the lifespan eliminates repeat purchases.
Does dimming change the math?
Dimmed bulbs use less power, so savings could be higher — the tool assumes full brightness.
How do I scale the savings?
Multiply per-bulb savings by the number of bulbs — a 40-bulb home saves ~$335/year on the example.
How much does an LED bulb save?
Roughly 85% of the bulb's energy — about $8–10 per year per bulb at typical use.
Do LEDs pay for themselves?
Yes — typically within the first year of typical use.
Should I match lumens or watts?
Lumens — it is the measure of brightness; watts are just power draw.
Cite this tool
BoringToolsKit. “LED Savings Calculator.” boringtoolskit.com/led-savings-calculator/ (reviewed 2026-08-25). Free to reference in articles, syllabi, and answer posts with a link.
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