How Many Porta Potties Do I Need? Calculator and Chart
Enter your guest count or crew size and get an exact number of units, accessible units and hand-wash stations — with every step of the math shown, so you can check it.
Live dispatch Mon–Sat 7am–7pm · Updated October 6, 2026
How many porta potties do I need for my event?
Plan 1 standard porta potty per 50 guests for an event of up to 4 hours. If the event runs 5 to 8 hours, add 1 unit per 100 guests. If it runs longer, add 2 per 100. If alcohol is served, add 1 more unit per 100 guests. Round every step up to a whole unit.
Porta potty chart by guest count
A 100-guest event needs 2 units for 4 hours, 3 units for 5–8 hours and 4 units for 5–8 hours with alcohol. A 300-guest event needs 6, 9 and 12 units for the same three cases. Include at least 1 wheelchair-accessible unit in every cluster.
| Guests | Up to 4 hours | 5–8 hours | 5–8 hours + alcohol |
|---|---|---|---|
| 25 | 1 | 2 | 3 |
| 50 | 1 | 2 | 3 |
| 75 | 2 | 3 | 4 |
| 100 | 2 | 3 | 4 |
| 150 | 3 | 5 | 7 |
| 200 | 4 | 6 | 8 |
| 300 | 6 | 9 | 12 |
| 500 | 10 | 15 | 20 |
| 1000 | 20 | 30 | 40 |
Worked example: 150-guest wedding, 5 hours, open bar
- 150 ÷ 50 = 3 base units.
- The wedding runs past 4 hours: 150 ÷ 100 = 1.5, round up to 2. Total 5.
- Alcohol is served: add 2 more. Total 7.
- Make 1 of the 7 wheelchair-accessible. Add 2 hand-wash stations near the food (7 ÷ 4, rounded up).
How many porta potties does a construction site need?
OSHA 29 CFR 1926.51(c) Table D-1 requires 1 toilet for 20 or fewer workers, 1 toilet seat and 1 urinal per 40 workers for 20 to 199 workers, and 1 toilet seat and 1 urinal per 50 workers for 200 or more. Paul Rental Works recommends 1 unit per 10 workers with weekly service.
Worked example: a framing crew of 15 working 45 hours a week. OSHA minimum: 1 toilet. Our recommendation: 15 ÷ 10 = 2 units serviced weekly, plus 1 hand-wash station. Legal minimum and recommendation are separate — confirm with your safety plan. Official text: OSHA 1926.51. Farm crews follow OSHA 1928.110: 1 toilet and 1 hand-washing facility per 20 workers within a quarter-mile walk.
Sizing questions
6 questions callers asked before booking, answered by our Rowlett dispatch team.
Ask dispatch: (469) 326-3946How many porta potties do I need for 100 guests?
For 100 guests at an event of up to 4 hours, plan 2 standard units. Add 1 unit if alcohol is served, and add 1 more if the event runs 5 to 8 hours. Use our calculator for your exact numbers.
How many porta potties for a 150-guest wedding with a bar?
A 150-guest, 5-hour wedding with a bar needs 7 units. Start with 3 units for 150 guests, add 2 because the event runs past 4 hours, then add 2 because alcohol is served. Make 1 of the 7 a wheelchair-accessible unit.
How many porta potties for a construction crew of 15?
OSHA's minimum for 15 workers is 1 toilet. Paul Rental Works recommends 2 standard units on weekly service, or 1 unit serviced twice a week, so the unit stays usable all week.
Is 1 porta potty enough for a backyard party of 40?
Yes. One unit covers about 40–50 guests for a 4-hour party. Add a second unit if the party runs all day or serves alcohol.
How many restroom trailers do I need?
A 2-stall restroom trailer typically suits up to about 100 guests for an evening event. Larger crowds need a bigger trailer or added standard units. Dispatch sizes trailers by guest count, length and whether a bar is open.
How many hand-wash stations do I need?
Plan 1 hand-wash station for every 4 toilets when food is served, and at least 1 near any food or vendor area. On job sites, place a station next to the toilets.
Get an itemized porta potty quote
Call (469) 326-3946 — dispatch quotes and books in one call. Prefer a form? Send six details and we call or text back with the unit, rental period, delivery, pickup, servicing and tax on one line-by-line quote.
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