Sizing calculator
How Many Porta Potties Do I Need?
Enter guests or crew size and get a count you can order from. The chart, the OSHA rule and worked examples are below.
Mon–Sat, 7 a.m.–7 p.m. · Same-day delivery when you call in the morning
Updated · Reviewed by Parker, owner
St. Cloud and every town within 80 miles: Stearns, Benton, Sherburne, Wright and beyond.
Same-day delivery when you call in the morning. Planned drops get a set window.
Standard for job sites and parties. Flushing or a trailer for weddings. Accessible for public events.
Weekly pump-out, cleaning and restock included on rentals over a week.
One itemized quote: unit, delivery, pickup, service and tax. No surprise fees.
How many porta potties do I need?Count it in ten seconds.
A 100-guest, 4-hour party needs 2 standard porta potties. A construction crew of 10 needs 1 unit with weekly service. Add 1 unit for every 5 on the chart when alcohol is served, and make at least 1 unit wheelchair-accessible at public events.
The event chart we use follows Portable Sanitation Association International (PSAI) planning guidance. Crew numbers show the OSHA legal minimum next to our recommendation. See the full chart and worked examples.
Estimate only. Call (320) 205-2511 and we will confirm the count for your site.
Event chart: porta potties by guests and hours
For events, find your guest count and event length on the chart. A 250-guest, 4-hour event needs 3 standard units. A 500-guest, 6-hour festival needs 6. Then apply three whole-number adjustments for alcohol, accessibility and hand washing, shown in the next section with a worked example.
| Guests | Up to 2 hrs | 3–4 hrs | 5–6 hrs | 7–8+ hrs |
|---|---|---|---|---|
| 50 | 1 | 1 | 2 | 2 |
| 100 | 1 | 2 | 2 | 3 |
| 150 | 2 | 2 | 3 | 3 |
| 200 | 2 | 3 | 3 | 4 |
| 250 | 2 | 3 | 4 | 4 |
| 300 | 3 | 4 | 4 | 5 |
| 400 | 4 | 5 | 5 | 6 |
| 500 | 4 | 5 | 6 | 7 |
| 750 | 6 | 7 | 8 | 10 |
| 1,000 | 8 | 9 | 11 | 13 |
How do alcohol, accessibility and food change the count?
Alcohol, accessibility and food each change the porta potty count by a whole number. Add 1 unit for every 5 on the chart when alcohol is served, with at least 1. Make at least 1 unit, or 5% of each cluster, wheelchair-accessible. Add 1 hand wash station for every 4 units when food is served.
Worked example: 150-guest wedding, 5 hours, bar and dinner
- Chart: 150 guests, 5–6 hours = 3 units.
- Alcohol: 3 ÷ 5 rounds up to 1 → add 1 = 4 units.
- Accessible: 5% of 4 rounds up to 1 → make 1 of the 4 wheelchair-accessible.
- Food: 4 ÷ 4 = 1 hand wash station.
Order: 3 standard or deluxe units, 1 wheelchair-accessible unit and 1 hand wash station. Accessible-unit rule: 2010 ADA Standards §213.2. Confirm event rules with your venue or permit office.
How many porta potties does a construction crew need?
A construction crew needs at least 1 toilet for up to 20 workers under OSHA's Table D-1, and 1 seat plus 1 urinal per 40 workers above that. For a 40-hour week with one weekly service, we recommend 1 unit for every 10 workers, so a 25-person crew gets 3 units.
| Workers | OSHA legal minimum | Our recommendation |
|---|---|---|
| 1–10 | 1 | 1 |
| 11–20 | 1 | 2 |
| 25 | 1 seat + 1 urinal | 3 |
| 40 | 1 seat + 1 urinal | 4 |
| 60 | 2 seats + 2 urinals | 6 |
| 100 | 3 seats + 3 urinals | 10 (or 5 with twice-weekly service) |
Source: OSHA 29 CFR 1926.51(c). Farm field crews follow 29 CFR 1928.110: 1 toilet and 1 hand washing facility per 20 workers. See construction rentals.
Questions people ask before they bookStraight answers, before you call.
How many porta potties for 100 guests?
100 guests need 2 standard units for a 3–4 hour event and 3 units for 7–8 hours. Add 1 if alcohol is served.
How many porta potties for 200 guests?
200 guests need 3 units for a 3–6 hour event and 4 units for 7–8 hours, before the alcohol adjustment.
How many porta potties for a graduation party?
A graduation party with 150 guests over 5 hours needs 3 standard units. Open houses with guests coming and going can use the 3–4 hour column.
How many people can use one porta potty?
The manufacturer rates a standard tank at about 200 uses before service. That is roughly 50 guests at a 4-hour event or 10 workers for a 40-hour week.
Do women need more porta potties?
Events with mostly women guests use units faster because urinals go unused. Add 1 unit for every 5 on the chart, the same step as for alcohol.
Need a porta potty in St. Cloud today?
Call now. Talk to dispatch, not a call center.
Call before your crew or guests arrive. We confirm the delivery window, the unit and the full price on the same call.
(320) 205-2511Phones answered Mon–Sat, 7 a.m.–7 p.m.. After hours, send the form and we call you first thing.