How Many Porta Potties Do I Need? (Calculator)
Enter guests, hours, alcohol and food. The calculator shows the unit count and every step of the math.
- Can you deliver to me?Plan your count here, then call. We confirm stock for your date across Mansfield and nearby cities on the call.
- When can it arrive?Event units drop the business day before. Saturday events get Friday delivery and Monday pickup, free.
- Which unit do I need?1 unit per 50 guests for 4 hours. Add 1 per 4 units with alcohol, and make 5% accessible.
- How is it cleaned?Event units arrive clean and stocked. Multi-day events can add a weekday service visit between days.
- What is the full cost?Multiply your count by the event rate on the price guide. One delivery fee covers every unit.
Weekday cutoff for same-day delivery. Call before noon and your unit rides this afternoon's route.
Mon–Fri 7 AM–6 PM · Sat 8 AM–12 PM. Live answer during business hours · Quote replies within 1 business hour.
How many porta potties do I need for my event?
You need 1 standard porta potty for every 50 guests at a 4-hour event. The method is guests × hours ÷ 200, rounded up. A 150-guest, 5-hour wedding with a bar needs 5 standard units: 4 from the base math and 1 more because alcohol is served.
The method, step by step
- Base count. Guests × hours ÷ 200, rounded up. 150 × 5 = 750; 750 ÷ 200 = 3.75 → 4 units.
- Alcohol. If alcohol is served, add 1 unit for every 4 in the base count, minimum 1. 4 base units → +1 = 5 units.
- Accessible units. Make at least 5% of each cluster accessible, minimum 1 (2010 ADA Standards, 213.2). 5 units → 1 accessible + 4 standard.
- Hand washing. If food is served, add 1 two-sided station per 4 units, minimum 1. 5 units → 2 stations.
Why 200? A standard unit's tank is rated for about 200 uses, and guests average about one restroom visit per hour. That is our planning method, built from tank ratings and how events actually run, not a legal requirement.
How many porta potties per guest count?
For a 4-hour event, 50 guests need 1 porta potty, 100 guests need 2, 200 guests need 4 and 500 guests need 10. Longer events need more: an 8-hour event doubles each number. Add the alcohol unit and an accessible unit on top of the counts in the table.
| Guests | 2 hrs | 4 hrs | 6 hrs | 8 hrs | 10 hrs |
|---|---|---|---|---|---|
| 50 | 1 | 1 | 2 | 2 | 3 |
| 75 | 1 | 2 | 3 | 3 | 4 |
| 100 | 1 | 2 | 3 | 4 | 5 |
| 150 | 2 | 3 | 5 | 6 | 8 |
| 200 | 2 | 4 | 6 | 8 | 10 |
| 300 | 3 | 6 | 9 | 12 | 15 |
| 500 | 5 | 10 | 15 | 20 | 25 |
| 1,000 | 10 | 20 | 30 | 40 | 50 |
How many porta potties does a work crew need?
A work crew of 20 or fewer people legally needs at least 1 toilet under OSHA 29 CFR 1926.51. With weekly service, we plan 1 standard unit for every 10 workers on a 40-hour week, so the tank never fills between visits. A 25-person crew gets 3 units, or 2 units with twice-weekly service.
Full crew tables and exemptions are in the OSHA porta potty requirements guide.
When should I add more porta potties?
Add porta potties when the event runs past 6 hours, when alcohol or lots of drinks are served, when most guests are women, when the restrooms are spread across a large site, or in July and August heat. Each of these shortens the time before a tank fills or lengthens the line.
- Alcohol: +1 per 4 units (built into the calculator).
- Spread-out sites: one cluster per area guests gather, each with its own accessible unit.
- Mostly-female crowds: add 1 unit per 4, because there is no urinal use.
- Kids' events: add a hand-washing station even if no food is served.
Sizing FAQ
Is one porta potty enough for 50 people?
For a party of 50 that lasts up to 4 hours, one standard unit is enough. For 6 hours or more, or with alcohol, rent 2.
How many porta potties for 100 guests?
100 guests need 2 standard units for a 4-hour event, or 3 if alcohol is served. Add 1 accessible unit if any guest uses a wheelchair or walker.
How many porta potties for 200 people?
200 people need 4 units for a 4-hour event and 6 for a 6-hour event, plus 1 for alcohol per 4 units. A 4-stall restroom trailer also covers about 250 guests.
Does the house bathroom count?
A house bathroom helps, but plan the porta potty count as if it were closed. Hosts who count on it usually end up with a line and guests walking through the house.
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