How Many Porta Potties Do I Need?
Enter guests or workers, hours and whether alcohol is served. The calculator shows each step in whole units.
- Same-day by noon
- Weekly cleaning included
- One itemized price
- Mon–Sat 7 AM–7 PM
How the calculator counts
The calculator uses our sizing guideline for events and OSHA Table D-1 for work crews. Every adjustment is a whole unit, so the math shows exactly where each unit comes from. It also adds hand wash stations at 1 per 3 toilets and accessible units at 5 percent per cluster.
- Events: 1 unit per 50 guests, rounded up
- Over 4 hours: add 1 unit per 150 guests
- Alcohol served: add 1 unit per 150 guests
- Food served: 1 hand wash station per 3 toilets, rounded up
- Public events: at least 1 wheelchair-accessible unit per cluster of up to 20 units (ADA 213.2, 5%)
- Work crews: OSHA minimum, plus our 1-per-10-workers recommendation for weekly service
How many porta potties do you need for an event?
You need 1 standard porta potty per 50 guests for an event up to 4 hours. Add 1 unit per 150 guests when the event runs longer than 4 hours, and 1 more per 150 guests when alcohol is served. Round every step up to a whole unit.
| Guests | Up to 4 hours | 4–8 hours | 4–8 hours with alcohol | Hand wash stations (food, up to 4 h) |
|---|---|---|---|---|
| 25 | 1 | 2 | 3 | 1 |
| 50 | 1 | 2 | 3 | 1 |
| 75 | 2 | 3 | 4 | 1 |
| 100 | 2 | 3 | 4 | 1 |
| 150 | 3 | 4 | 5 | 1 |
| 200 | 4 | 6 | 8 | 2 |
| 250 | 5 | 7 | 9 | 2 |
| 300 | 6 | 8 | 10 | 2 |
| 500 | 10 | 14 | 18 | 4 |
| 1,000 | 20 | 27 | 34 | 7 |
This guideline is our company method, based on the 60-gallon tank of a standard unit and typical use per guest. It is a recommendation, not a legal requirement. Your venue, park or permit office may set its own minimum.
How many porta potties does a construction site need?
A construction site needs at least 1 toilet for 20 or fewer workers, and 1 toilet seat plus 1 urinal per 40 workers above 20, under OSHA 29 CFR 1926.51 Table D-1. For crews above 200, the ratio is 1 seat and 1 urinal per 50 workers.
Legal minimum vs our recommendation: a 30-person crew meets OSHA with 1 standard unit, because each unit has a seat and a urinal. We recommend 3 units with weekly service, because 30 people working 40 hours fill a 60-gallon tank in about 3 days. Two service visits a week is the alternative. Check your contract and safety plan.
How many porta potties does a farm crew need?
Farm crews of 11 or more hand laborers need 1 toilet and 1 hand washing facility per 20 workers, within a quarter-mile walk, under OSHA 29 CFR 1928.110. Crews working 3 hours or less in the field, including travel, are exempt.
How many porta potties do I need for 100 guests?
100 guests at an event up to 4 hours need 2 standard units. Add 1 unit if the event runs longer than 4 hours and 1 more if alcohol is served. Add a hand wash station when food is served.
How many porta potties for a wedding of 150?
A 150-guest, 5-hour wedding with a bar needs 5 standard units: 3 for the guest count, 1 for the extra hours and 1 for alcohol. Add 1 wheelchair-accessible unit and 2 hand wash stations.
How many porta potties for 500 people?
500 guests for up to 4 hours need 10 standard units. Add 4 more if the event runs longer than 4 hours and 4 more if alcohol is served. Large public events also need at least 1 wheelchair-accessible unit in each cluster.
Is one porta potty enough for about 40 guests?
One standard unit handles 40 guests for an event up to 4 hours. If the party runs all day or serves alcohol, add a second unit.
We already have a bathroom in the house. Do we still need one per 50 guests?
An open indoor bathroom counts as one unit. For 100 guests with one indoor bathroom open, one rented unit usually covers a 4-hour party.
Fastest way to book
Get one itemized price
Call and dispatch checks your ZIP, your date and the unit while you are on the line.
(260) 290-5767- Unit, delivery, pickup, service and tax on one quote
- Same-day slots confirmed by phone
- No account or deposit needed to get a price