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Energy Savings From LED Calculator

Work out energy savings from led instantly with clear inputs, formula shown and shareable results.

About Energy Savings From LED Calculator

Swapping twelve 60 W incandescent lamps for 8 W LEDs used five hours a day saves 1140 kWh a year - an 87% cut in lighting power - and avoids about 239 kg of CO2 at a 210 g/kWh grid. LEDs also last 25,000 hours against 1000 for incandescent, so the replacement saving compounds.

Formulas

Annual saving

kWh = (old W - new W) x hours/day x 365.25 x lamps / 1000

Carbon saving

kg CO2 = kWh x grid intensity

Worked example

With the default values below, Energy Savings From LED Calculator returns Annual Electricity Saved of 1,139.6. Change any input above and every figure here is recalculated in your browser.

Inputs used

Old lamp powerminimum 0 W
60 W
LED replacement powerminimum 0 W
8 W
Hours used per dayaccepts 0–24 h
5 h
Number of lamps replacedminimum 0
12

Results

Annual Electricity Saved
1,139.6 kWh
Annual Carbon Dioxide Avoided
239.3 kg
Reduction In Lighting Power
86.7%
Daily Saving
3.1200 kWh

Step by step

  1. 1Values used
  2. 2Annual saving
  3. 3Carbon saving
  4. 4Annual Electricity Saved= 1,139.6 kWh
  5. 5Annual Carbon Dioxide Avoided= 239.3 kg
  6. 6Reduction In Lighting Power= 86.7
  7. 7Daily Saving= 3.1200 kWh

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Does the LED give the same light?

A good 8 W LED produces about 800 lumens, matching a 60 W incandescent. Compare lumens rather than watts when replacing.

Is there a downside in cold climates?

Marginally - incandescent waste heat contributed to space heating in winter, but it is a very expensive way to heat a room.

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