For events with alcohol, increase unit count 20–30%. For public events in the U.S., allocate at least 5% ADA-compliant units (round up). For construction sites, OSHA recommends one toilet per 20 workers.
| Guests (4–6 hrs) | Baseline units | + With alcohol | ADA (≥5%) |
|---|---|---|---|
| 1–50 | 1 | 2 | 1 |
| 51–100 | 2 | 3 | 1 |
| 101–250 | 3–5 | 4–6 | 1–2 |
| 251–500 | 6–8 | 8–10 | 1–3 |
This is a general planning guide. Confirm with your venue, jurisdiction, and vendor.