Return-On-Investment Calculator


Enter Step 1. Calculate the total kilowatts saved by replacing the inefficient lamps with more efficient lamps
  Enter Original Lamp Wattage    
  Enter Replacement Lamp Wattage

-

 
 

Watts Saved per Lamp =

  Enter Numbers of Lamps to replace

x

 
 

Total Watts Saved =

 

Total Kilowatts Saved =


Step 2. Calculate the total kWh per year saved by this upgrade
  Total Kilowatts Saved    
  Enter Hours Used per Day

x

 
  Enter Days Used per Week

x

 
  Enter Weeks Used per Year

x

 
 

Total kWh Saved per Year =


Step 3. Calculate the total energy costs saved per year by this upgrade
  Total kWh Saved per Year    
  Enter Your Energy Cost per kWh (typically $.10)

x

 
 

Total Energy Cost Savings per Year =


Step 4. Compute the payback of the upgrade
Enter Initial Cost of Lighting Upgrade

$

 
  Total Energy Cost Savings per Year

/

 
 

# of Years for Payback on Investment =

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