Result
$5.96
Switching saves about $5.96 per month at these inputs.
- Incandescent monthly cost
- $7.01
- LED monthly cost
- $1.05
More
Optional equipment checkWhat to compare before buying
Compare LED bulbs by base type, shape, brightness, color temperature, dimmer compatibility, fixture rating, and multipack size.
Buying checklist
At a glance
- Cost
- Free
- Login
- Not required
- Best use
- Compare electricity cost for LED and incandescent bulbs from watts, hours used, bulb count, and electricity rate.
- Output
- Browser result with print and PDF options
Result summary
Quick answer
With the sample inputs, this calculator returns $5.96. Incandescent monthly cost: $7.01. The result is an estimated operating cost from the wattage, run time, and rate you enter. Use your all-in kWh rate if you want it to line up more closely with a bill.
Instructions
How to use this calculator
Open the short walkthrough for choosing and checking inputs.
The calculator compares monthly kWh cost for two bulb wattages across the same usage.
Page guide
On this page
Jump directly to the part of the calculator you need.
Calculation details
Formula and methodology
See the exact math used to produce the result.
Total cost = the rate, price, or recurring charge multiplied by usage, quantity, or billing period, with fees added where relevant.
Before acting
Assumptions to check
Review the real-world details that can change the estimate.
The key inputs are Incandescent watts, LED watts, Bulb count, Hours per day, Electricity rate. Confirm watts, hours used, local electricity rate, duty cycle, seasonal use, and efficient alternatives before relying on the cost.
More guidance Examples, methodology, and planning checks Open the worked example, review notes, reference tables, and practical next checks.
When to round up
Round up if lights run longer during winter or in high-use rooms.
When to use this calculator
- Estimating monthly or yearly energy cost
- Testing watts, runtime, rate, and duty cycle changes
- Comparing efficient alternatives before buying or changing use
Tips for better estimates
- Use measured watts when possible, especially for appliances that cycle on and off.
- Enter the all-in local electricity rate from a recent bill.
- Rerun the estimate for seasonal use, lower runtime, or a more efficient alternative.
Worked example
Example inputs: Incandescent watts: 60 watts; LED watts: 9 watts; Bulb count: 6; Hours per day: 4; Electricity rate: $0.16 /kWh. With those values, the calculator returns $5.96. Switching saves about $5.96 per month at these inputs.
Appliance wattage to estimated monthly cost
| 100 watts for 8 hours/day | About $3.90/month at $0.16/kWh |
|---|---|
| 500 watts for 8 hours/day | About $19.47/month at $0.16/kWh |
| 1,000 watts for 8 hours/day | About $38.93/month at $0.16/kWh |
| 1,500 watts for 8 hours/day | About $58.40/month at $0.16/kWh |
Example scenarios
- Use $5.96 as a cost snapshot, then rerun it with the device's measured watts and your local kWh rate.
- A heater, pump, refrigerator, or dehumidifier may cycle, so duty cycle can matter more than nameplate wattage.
- Seasonal use can change the yearly total; compare efficient alternatives before replacing equipment.
Quick reference chart
| Sample result | $5.96 |
|---|---|
| Incandescent monthly cost | $7.01 |
| LED monthly cost | $1.05 |
| Best next step | Use this estimate with the real watts, hours used, local electricity rate, duty cycle, and seasonal use. Compare efficient alternatives if the monthly or yearly cost is higher than expected. |
FAQs
LED vs Incandescent Bulb Cost Calculator questions
Can I use this as my exact bill amount?
No. Use it as a planning estimate, then compare watts, hours used, local electricity rate, duty cycle, seasonal use, taxes, and fees with your actual bill.
What rate should I use?
Use the all-in local kWh rate from a recent bill when possible, including delivery charges, riders, taxes, and usage-based fees.
How can I lower the estimated cost?
Try fewer hours, a lower wattage device, better duty-cycle assumptions, off-peak use where available, or a more efficient alternative.
Is the led vs incandescent bulb cost calculator exact?
No. It is a cost planning estimate. Actual bills depend on all-in rates, taxes, fees, runtime, duty cycle, weather, and real equipment performance.
What inputs matter most?
Wattage difference, bulb count, hours, and electricity rate determine savings.
Should I add a cost buffer?
Yes. Rates, fees, runtime, weather, standby power, and real-world efficiency can make actual costs higher than a simple estimate.
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Common planning mistakes
Using nameplate watts when actual draw is lower, ignoring duty cycle, using the advertised rate instead of the all-in local rate, and assuming seasonal use stays the same all year.
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