Searching the web for great resources, we stumbled across a comprehensive spreadsheet for calculating energy usage in your compressed air system from Minessota Technical Assistance Program (MnTAP). Click here to download: http://www.mntap.umn.edu/greenbusiness/energy/compairtool.xlsm

NOTE: Click on Enable Content box at top of page before entering information. Learn more about the tool and MnTAP at http://www.mntap.umn.edu/greenbusiness/energy/compair.htm