How Many Porta Potties Do I Need?
Enter your guest count and event length for a starting number, then see the rule behind it and when to add more.
Porta potty calculator
The calculator uses the planning rule below. It shows a starting count, not a legal minimum.
How many porta potties do I need for my event?
Plan 1 standard porta potty for every 50 guests at an event of up to 4 hours. For events of 4 to 8 hours, add 1 unit for every 100 guests. Past 8 hours, add 1 more per 100. If alcohol is served, add 1 unit for every 150 guests, with at least 1 added.
| Guests | Up to 4 hours | 4 to 8 hours | Over 8 hours |
|---|---|---|---|
| 25 | 1 | 2 | 3 |
| 50 | 1 | 2 | 3 |
| 100 | 2 | 3 | 4 |
| 150 | 3 | 5 | 7 |
| 200 | 4 | 6 | 8 |
| 300 | 6 | 9 | 12 |
| 500 | 10 | 15 | 20 |
| 1,000 | 20 | 30 | 40 |
How do I adjust the count for alcohol, food and accessibility?
Adjust the porta potty count in whole steps. If the table says 5 units and beer is served to 150 guests, add 1 unit. If food is served, add 1 hand-washing station for every 3 units. For a public event, make at least 5 percent of units wheelchair-accessible, and never fewer than 1.
Worked example: a 150-guest, 6-hour wedding with a bar
- Base: 150 guests ÷ 50 = 3 units.
- Length over 4 hours: 150 ÷ 100 = 1.5, round up to 2. Total 5.
- Alcohol: 150 ÷ 150 = 1. Total 6 units.
- Food: 6 ÷ 3 = 2 hand-washing stations.
- Accessible: 1 of the 6 units should be wheelchair-accessible.
The accessible rule comes from the 2010 ADA Standards, section 213.2, published by the U.S. Access Board.
How many porta potties does a job site need?
A job site needs at least 1 toilet for 20 or fewer workers under OSHA 29 CFR 1926.51(c). Above 20 workers, the rule calls for 1 toilet seat and 1 urinal per 40 workers, and 1 per 50 above 200. With weekly service, plan 1 standard unit per 10 workers for a 40-hour week.
A crew of 15 meets the legal minimum with 1 unit, but 2 units keep the wait short and the unit fresh between weekly services. Full details are in the OSHA porta potty guide and on osha.gov.
When should I add more than the table says?
Add one unit above the table when most guests are women or children, when the event runs through a meal, when temperatures top 95°F, or when units sit far apart in two clusters. Long lines are the most common complaint at events, and one extra unit costs less than a crowded house bathroom.
- Separate clusters at a ceremony site and a reception site each need their own count.
- Tailgates and game-day parties run long, so use the 4 to 8-hour column.
- Family reunions with many young kids benefit from one wheelchair-accessible unit for parents.
Questions renters ask
Is one porta potty enough for 100 people?
One porta potty is not enough for 100 people at most events. Plan 2 units for a 4-hour event and 3 for an event up to 8 hours. Add 1 more if alcohol is served.
How many porta potties do I need for a 4-hour party of 50?
A 4-hour party of 50 guests needs 1 standard porta potty. Add a second unit if alcohol is served, or if the party runs past 4 hours. A hand-washing station helps when food is served.
Do I need separate porta potties for men and women?
Separate porta potties for men and women are not required. Each standard unit has a toilet and a urinal. Some hosts rent pairs and label them, which helps lines at weddings.
How many hand-washing stations do I need?
Plan 1 hand-washing station for every 3 porta potties, and at least 1 wherever food is served. Job sites with paint, coatings or concrete work need handwashing under OSHA 29 CFR 1926.51(f).
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