This calculator allows you to enter the cost of your upgraded equipment or building and the annual savings that result to calculate the Internal Rate of Return (IRR), Return on Investment and the year in which payback will be achieved. We have inserted example figures, but you will need to change these to reflect your own situation. To calculate results for different time periods, simply leave boxes for years after your end year blank (do not put zero).

Steps:

1. Enter the cost of upgrading your current equipment (or building as a whole) in the first yellow highlighted box. Important: This figure must be negative.

2. Enter the expected fuel / electricity cost savings from the new equipment (or for building as whole after upgrades) in each year of your investment period.  Leave cells after your chosen end year blank.

5. Scroll to the bottom of the page and click "Update".