Required water closets, lavatories, drinking fountains, and service sinks by occupant load and occupancy — IBC 2902.1 / IPC Table 403.1.
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Required plumbing fixtures come from the occupant load split by sex (default 50/50 per IPC 403.1), with the water-closet, lavatory, drinking-fountain, and service-sink ratios for the occupancy applied and each result rounded up to the next whole fixture. A service sink is a flat minimum of at least one. Always verify against local amendments — jurisdictions frequently amend Chapter 29. For the full method, see our plumbing fixtures guide.
Check your full plan set →This calculator uses model code references for general reference. It is not a substitute for the adopted code and amendments enforced by your local authority having jurisdiction. Always verify against the edition and amendments your jurisdiction has adopted.