Plumbing Fixture Calculator

Minimum fixture counts per NSPC Table 7.21.1. Supports mixed occupancies. 50/50 gender split assumed unless adjusted.
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Occupancies

Occupancy Type

Occupant Load (Building Code)

Male %

Female %

Settings

Apply 2/3 occupant load reduction

NSPC 7.21.2 — Plumbing occupant load = 2/3 of building code occupant load

Apply urinal substitution (male WC reduction)

NSPC — Each urinal above minimum may replace 1 WC. WC count cannot drop below 2/3 of requirement.

Required Fixtures

Fixture	Male	Female	Total

This calculator provides preliminary estimates based on NSPC Table 7.21.1 fixture ratios. Verify all counts against the current NJ-adopted edition of the National Standard Plumbing Code. Fixture ratios vary by occupancy sub-type and local amendments. This tool does not replace professional code analysis. Green Stories LLC is a building design and consulting firm.