Porta potty calculator
Enter your headcount. Get the unit count, hand wash stations and the chart row behind every number. It runs in your browser; nothing is sent anywhere.
Published minimums. Heat, crowds arriving at once and long days push the number up; the local operator makes the final call.
The charts behind the numbers
OSHA minimum and the industry standard
The legal floor is OSHA Table D-1, 29 CFR 1926.51(c): one facility for 20 or fewer workers, then one toilet seat and one urinal per 40 workers, and per 50 at 200 or more. The working number is ANSI/PSAI Z4.3: one weekly-serviced unit per 10 workers per 8-hour shift. The result always includes a hand wash station: OSHA requires one near work with paints, coatings or other contaminants, Cal/OSHA on every California site, and most contractors expect one anyway. Hand washing requirements.
The PSAI event chart
Built on one restroom visit per person every four hours, no pumping during the event and an even mix of men and women. Between two rows the calculator uses the higher one. Alcohol adds 10 to 20 percent, public events need at least five percent ADA units, and hand wash stations follow PSAI's one per 10 toilets. How many porta potties do I need.
| Guests | 1h | 2h | 3h | 4h | 5h | 6h | 7h | 8h | 9h | 10h |
|---|---|---|---|---|---|---|---|---|---|---|
| 1-50 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 |
| 100 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 |
| 250 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 |
| 500 | 2 | 4 | 4 | 5 | 6 | 7 | 9 | 9 | 10 | 12 |
| 1,000 | 4 | 6 | 8 | 8 | 9 | 9 | 11 | 12 | 13 | 13 |
| 2,000 | 5 | 6 | 9 | 12 | 14 | 16 | 18 | 20 | 23 | 25 |
| 3,000 | 6 | 9 | 12 | 16 | 20 | 24 | 26 | 30 | 34 | 38 |
| 4,000 | 8 | 13 | 16 | 22 | 25 | 30 | 35 | 40 | 45 | 50 |
| 5,000 | 12 | 15 | 20 | 25 | 31 | 38 | 44 | 50 | 56 | 63 |
| 6,000 | 12 | 15 | 23 | 30 | 38 | 45 | 53 | 60 | 68 | 75 |
| 7,000 | 12 | 18 | 26 | 35 | 44 | 53 | 61 | 70 | 79 | 88 |
| 8,000 | 12 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| 10,000 | 15 | 25 | 38 | 50 | 63 | 75 | 88 | 100 | 113 | 125 |
Sources
One phone call places the order.
Tell dispatch your headcount, dates and address. The closest truck gets routed.
Dispatch open Mon-Fri 8:30am-9pm ET, Sat 9am-3pm ET