If you would like to know what size your water service (pipe from street to house shutoff) should be – here is a spreadsheet I created for my plumbing business that you are welcome to download.
Just fill in the quantities of each type or group of fixtures in column “A” and the appropriate size of your water service will show in bottom right cell of worksheet.
Note that this is to code in British Columbia and may not be applicable to your location. Ask a plumbing inspector!
You will need to enable macros and I Guarantee it is SAFE – its just a macro to clear quantities from sheet.
You may alternatively not enable macros and just delete quantities in Column A manually.
Download here: BC Plumbing Code Water Service Sizing