Porta potty calculator
Enter your guest count, hours and whether food and alcohol are served. For jobsites, switch to crew mode and enter workers on site. The result shows total toilets, how many must be accessible, and hand-wash stations, plus the exact math used.
How many porta potties per person?
Plan 1 standard porta potty for every 50 guests at an event that lasts up to 4 hours. Always round up. For 120 guests, 120 ÷ 50 = 2.4, so plan 3 units. Jobsites follow OSHA instead: 1 unit for 20 or fewer workers, then 1 per 40 workers.
| Guests | ≤ 4 hrs | 5–8 hrs | 5–8 hrs + alcohol | Accessible (incl.) | Hand-wash (food) |
|---|---|---|---|---|---|
| 25 | 1 | 2 | 3 | 1 | 1 |
| 50 | 1 | 2 | 3 | 1 | 1 |
| 75 | 2 | 3 | 4 | 1 | 1 |
| 100 | 2 | 3 | 4 | 1 | 1 |
| 150 | 3 | 4 | 5 | 1 | 2 |
| 200 | 4 | 5 | 6 | 1 | 2 |
| 300 | 6 | 8 | 10 | 1 | 3 |
| 400 | 8 | 10 | 12 | 1 | 3 |
| 500 | 10 | 13 | 16 | 1 | 4 |
| 750 | 15 | 19 | 23 | 2 | 6 |
| 1000 | 20 | 25 | 30 | 2 | 8 |
How do I adjust for long events and alcohol?
Add 1 unit for every 200 guests when the event runs longer than 4 hours. Add 1 more unit for every 200 guests when alcohol is served. Worked example: 150 guests, 5 hours, beer and wine. Base 150 ÷ 50 = 3. Long event adds 1. Alcohol adds 1. Total 5 units.
- Base: guests ÷ 50, rounded up.
- Longer than 4 hours: + (guests ÷ 200, rounded up).
- Alcohol served: + (guests ÷ 200, rounded up).
- Make at least 5% of units accessible, minimum 1.
- Food served: 1 hand-wash station per 4 toilets.
How many porta potties does a jobsite need?
A jobsite needs 1 toilet for 20 or fewer workers, and 1 seat plus 1 urinal for every 40 workers above that, under OSHA 29 CFR 1926.51 Table D-1. A standard unit has both. Sites with 200 or more workers need 1 per 50. A 45-person crew needs 2 units.
| Workers on site | OSHA minimum (Table D-1) | Standard units that meets it | Our recommendation |
|---|---|---|---|
| 1–20 | 1 toilet | 1 | 1, plus a hand-wash station if crews eat on site |
| 21–40 | 1 seat + 1 urinal per 40 workers | 1 | 2 if the crew works over 40 hours a week |
| 41–80 | 1 seat + 1 urinal per 40 workers | 2 | 2 units, serviced twice a week |
| 81–120 | 1 seat + 1 urinal per 40 workers | 3 | 3 units + 1 hand-wash station |
| 121–199 | 1 seat + 1 urinal per 40 workers | 4–5 | Split units across the site |
| 200+ | 1 seat + 1 urinal per 50 workers | workers ÷ 50, rounded up | Call for a site plan |
What about multi-day festivals and fairs?
Multi-day festivals use the same daily count, then add service visits. Plan the count for the busiest day and schedule a pump-out every night or every morning before gates open. A 2-day, 1,000-guest fair with a beer tent needs about 30 units, at least 2 accessible, and 8 hand-wash stations.
AssumptionThese counts assume units are serviced before each event day. Without nightly service, double the count for the second day.
Quick answers by headcount
How many porta potties for 100 guests?
For 100 guests and an event of 4 hours or less, plan 2 standard porta potties. If the event runs 5 to 8 hours, plan 3. With alcohol over 5 to 8 hours, plan 4, including 1 wheelchair-accessible unit.
How many porta potties for 200 people?
For 200 people at an event of 4 hours or less, plan 4 porta potties. For 5 to 8 hours with alcohol, plan 6, with at least 1 accessible unit and 2 hand-wash stations if food is served.
How many porta potties for a wedding of 150?
A 150-guest wedding of 5 hours with a bar needs 5 toilets: often 4 flushing units with sinks and 1 accessible unit, or a 2-stall trailer plus 3 units.
How many porta potties for 10 workers?
Ten workers need 1 porta potty under OSHA Table D-1, which covers up to 20 workers with 1 toilet. Add a hand-wash station if the crew eats on site.
Should I count all guests or peak guests?
Count guests at the busiest hour. A 300-person open house where only 100 are there at once needs units for 100.