How to use the calculator
The calculator can be used without Google sign-in. Prepare data for one reporting period, ideally one year, together with the source and assumptions behind each figure.
You do not need to sign in to calculate, review results, print, or export to Excel. Google sign-in is only required if you want to save a project online and reopen it later.
- Create a new calculation.Click “+ Start calculating”, then enter the project name, organisation, reporting year, and networking period basis.
- Complete the relevant categories.Add on-premise servers, cloud services, networking, website use, or travel. Categories with no activity may be left empty.
- Use the units shown.Enter utilisation as a value from 0–100; for example, enter
75for 75%. PUE must be at least 1. - Record evidence and assumptions.Enter the data source, confidence level, and notes for every estimated or proxy value.
- Review the calculated results.The summary updates automatically and shows total emissions and category-level results in kgCO₂e.
- Export the results to Excel.Click “Export Excel” to save inputs, category results, sources, assumptions, confidence levels, and methodology notes. Sign-in is not required.
- Save the project online if required.Click “Save” and sign in with any verified Google account. Your account will be created automatically the first time you sign in, and the saved project will be linked to your account.
- Print the report if required.Click “Print / PDF” to print the results or save them as a PDF using your browser’s print dialog.
An Excel file can be used as a standalone copy of the results without saving the project to the server. Saved projects are accessible only to their signed-in owner and administrators.
+ Start calculating