GHG Emissions Inventory Spreadsheet

Emissions Inventory Spreadsheet Anyone?

Hello. I have been given the task of collecting historical district wide data (for a baseline) and finding a proven spreadsheet to use for ghg emissions inventory purposes. Ideally, it would be adaptable to cover five separate schools each reporting the same categories. I went online and most of the carbon calculators that I saw were either too basic or complex. I prefer a spreadsheet so that I can convert the data into graphs for visual presentation. Can anyone suggest or send one to me? Thank you for your cooperation in advance.