This calculator allows you to calculate your Internal Rate of Return (IRR), Return on Investment (ROI) and Simple Payback based on the improvement in energy efficiency that results from replacing equipment such as boilers or chillers. We have inserted example figures, but you will need to change these to reflect your own situation. Results are calculated for five, seven, 10 and 15 year periods.

Steps:

1. Enter the energy efficiency factor for the current equipment in the first line.

2. Enter the energy efficiency factor for the new replacement equipment in the second line.

3. Enter your current fuel or electricity costs associated with the equipment being replaced in the third line.

4.  Enter the cost of the replacement equipment in the final line. Important: This value must be negative.

4. Click "Update".