How Many Porta Potties Do I Need?
Enter guests and hours, or your crew size, and get a whole-number answer with the math shown. Charts and worked examples follow.
How many porta potties do I need for an event?
An event needs 1 standard porta potty for every 250 guest-hours, rounded up. A 150-guest, 4-hour party is 600 guest-hours, so it needs 3 units. A 300-guest, 6-hour festival is 1,800 guest-hours and needs 8. Alcohol and meals add units, shown below.
| Guests | 2 hours | 4 hours | 6 hours | 8 hours |
|---|---|---|---|---|
| 50 | 1 | 1 | 2 | 2 |
| 100 | 1 | 2 | 3 | 4 |
| 150 | 2 | 3 | 4 | 5 |
| 200 | 2 | 4 | 5 | 7 |
| 300 | 3 | 5 | 8 | 10 |
| 500 | 4 | 8 | 12 | 16 |
Where the 250 comes from: one standard unit holds about 60 gallons and handles roughly 200 to 250 uses between services. Guests use a restroom about once every 2 to 3 hours on average. This is our dispatch planning rule, not a law; permits and venues can require more.
How many extra porta potties do I need when alcohol is served?
Add 1 porta potty for every 5 units when alcohol is served, and another 1 for every 5 when a full meal is served. A party that starts at 5 units becomes 6 with a bar, and 7 with a bar and dinner.
Worked example
A 200-guest wedding reception runs 5 hours with a bar and dinner. 200 × 5 = 1,000 guest-hours. 1,000 ÷ 250 = 4 units. Bar: add 1 (4 ÷ 5, rounded up). Dinner: add 1. Total: 6 units. At least 1 should be wheelchair-accessible, and 2 handwashing stations cover 6 toilets.
How many porta potties does a construction site need?
A California construction site needs 1 toilet for every 20 workers, or fraction of 20, under Cal/OSHA Title 8 §1526. A crew of 20 needs 1; a crew of 21 needs 2; a crew of 45 needs 3. Weekly service is included; add a second weekly service when a unit serves more than 10 workers in summer heat.
Official text: Cal/OSHA §1526. See the construction rental page for the full crew table.
How many wheelchair-accessible units do I need?
Plan at least 1 wheelchair-accessible porta potty for every cluster of units, and 5% of the units in each cluster, rounded up. A row of 10 needs 1; a row of 21 needs 2. This follows section 213.2 of the 2010 ADA Standards for portable toilets in a cluster.
Official text: ADA Standards §213.2. Compare units on the accessible unit page.
How many handwashing stations do I need?
Plan 1 handwashing station per site, plus 1 more for every 4 toilets. Events with food need a station near the food line. A row of 8 toilets at a festival needs 2 to 3 stations. Construction sites need washing facilities under Cal/OSHA §1527.
See handwashing station rental for capacity and refill details.
Straight answers
Questions about this guide
Every answer here comes from questions renters ask before they book. Still unsure? Ask a dispatcher.
Call now(909) 939-1771How many porta potties for 100 guests?
For 100 guests over 4 hours, plan 2 standard porta potties. Add 1 if alcohol is served. For 8 hours, plan 4.
How many porta potties for 50 people?
For 50 people over 4 hours, 1 standard porta potty is enough. For an all-day event or with a bar, plan 2.
How many porta potties for 200 people?
For 200 guests over 4 hours, plan 4 standard porta potties; over 6 hours, plan 5. Add 1 for a bar.
Do women need more porta potties than men?
Women's restroom visits take longer, so events with mostly female guests do better with 1 extra unit per 5.
Is one porta potty enough for a house remodel?
One unit covers a remodel crew of up to about 10 workers with weekly service.
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