Energy Savings Calculation

Energy Savings Calculation

  • To calculate energy dollars saved over the life of a light bulb, use this formula
  • All you need is the present bulb wattage and your recommended bulb wattage and life
Present Bulb Wattage   Watts
Subtract    
Recommended Bulb Wattage   Watts
Equal Wattage Saved   Watts
Multiply    
By Recommended Bulb Life   Hours Life
Equals Energy Saved   Watt-Hours
To Convert to Kilowatt Hours Divide by 1000   /1000
Equals Energy Saved   Kilowatt Hours
Multiply by Energy Rate*   X $0.10
Equals Energy Dollars Saved by Each Bulb   $
*Based on $0.10 per/kwhr. Use your local rate to determine savings