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Fixture Unit Calculator
Total WSFU from IPC 2021 Table E103.3(2) and DFU from Table 709.1 — then take each number to the calculator that actually uses it
Prescriptive starting point only — two separate totals from two separate IPC tables, not a substitute for the plumbing code your city adopted.
Water-supply fixture units (WSFU) come from 2021 International Plumbing Code Table E103.3(2), private occupancy, Total column (Colorado / Connecticut IPC 2021 on UpCodes). Drainage fixture units (DFU) come from IPC 2021 Table 709.1. They are not the same number and they do not go into the same calculator. Hose bibbs are not in Table E103.3(2); IPC Appendix E treats them as continuous gpm. UPC Table 610.3 (Hawaii Plumbing Code 2021) assigns 2.5 WSFU to the first hose bibb. Public occupancy, flushometer batteries, and unlisted fixtures need the code book, not this residential list. Not a permit.
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