You can now export your monthly and historic usage to a comma-separated .csv file (the dot is used as a decimal separator) from https://addpipe.com/usage. It also works for yearly and 6mo plans.
To import the resulting .csv file in Google Sheets:
- Go to https://sheets.google.com/ and create a new spreadsheet
- Click File > Import and upload the exported .csv file from your desktop
- In the Import file modal select the Comma for Separator type (just to be sure)
- You can replace the cells in the Cost columns and Total rows with formulas to verify our calculations