FREE CONTRACTOR TOOL
Water Pipe Sizing Calculator
Water pipe sizing starts with probable fixture demand, available pressure, developed length and actual inside diameter. Our tool supports the 2023 Florida Residential Code fixture-unit-to-GPM demand table within its published range, then compares candidate sizes using preliminary friction and velocity estimates.
Open the calculator →How to use it
Open the calculator, enter the measurements and design assumptions for the portion of the system you are working on, then review the result and the stated limitations. Recheck actual fixture and equipment requirements before ordering material.