Energy & Environment

LED Bulb Savings Calculator

Enter how many bulbs you replace and how long they are on to see your savings.

By TheCalcTools Updated Formula checked and tested

Your numbers

Symbol only: enter amounts in the currency you pick.
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Your results

Yearly saving
Yearly saving
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Energy saved per year (kWh)
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Payback time (months)
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Energy reduction
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LED Bulb Savings Calculator by TheCalcTools

How the LED Bulb Savings Calculator works

Savings = number of bulbs × watts saved × hours per year. A 60 W incandescent bulb gives about the same light as an 8 to 9 W LED (about 800 lumens).

LEDs also last far longer (often 15,000 to 25,000 hours against about 1,000 for incandescent), which adds savings not counted here.

The formula

kWh saved = bulbs × (old W − LED W) × hours/day × 365 ÷ 1000

Worked example

Using the default values shown in the calculator:

Number of bulbs10
Old bulb power (W)60
LED power (W)8.5
Hours on per day4
Electricity price per kWh$0.18
Price per LED bulb$3
  1. 10 bulbs × 51.5 W × 4 h × 365 = 752 kWh a year, saving $135.34.
  2. The LEDs pay for themselves in 2.7 months.

Result:

Yearly saving$135.34
Energy saved per year (kWh)752
Payback time (months)2.7
Energy reduction86%

Frequently asked questions

How do I match brightness?

Compare lumens, not watts: 450 lm ≈ 40 W incandescent, 800 lm ≈ 60 W, 1,600 lm ≈ 100 W.

Sources and further reading

Electricity Bill Calculator (Tiered Tariff)Enter your units and tariff to estimate the bill and the average price per kWh Standby Power Cost Calculator (Phantom Load)Enter the standby power of your devices to see what idle electricity costs you Appliance Energy Cost CalculatorSee what a device costs to run from its wattage

More in Energy & Environment · All calculators

This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.