Sizing Guide
How Many Restroom Stalls Do I Need for a Wedding or Event?
Quick table by guest count, a sizing calculator, and the factors that nudge the number up.
As a starting rule, plan for one restroom stall per 75 guests for an event under four hours — then add 15–25% more capacity for longer events or ones where alcohol is served. So a 150-guest, four-hour wedding needs about two stalls; a long reception with a bar pushes that toward three. Below is a quick table by guest count, plus the factors that nudge the number up.
Quick sizing table
| Guests | Short event (under 4 hrs) | Long / bar / all-night |
|---|---|---|
| Up to 75 | 1–2 stalls (2-stall trailer) | 2 stalls (2-stall trailer) |
| 76–150 | 2 stalls (2-stall trailer) | 3 stalls (3-stall trailer) |
| 151–225 | 3 stalls (3-stall trailer) | 3 stalls + overflow, or two trailers |
| 226–300 | 3 stalls + overflow, or two trailers | Two trailers |
| 300+ | Two or more trailers | Two or more trailers |
A "stall" is one private toilet room. A 2-stall trailer has two; a 3-stall has three. These are comfort-first recommendations — sized so guests aren't waiting during the toast, not the bare minimum.
Interactive sizing calculator
Move the guest count, choose your event length and bar service, and get an instant trailer recommendation:
What changes the number
- Event length. The longer guests are on site, the more restroom trips — the single biggest factor after headcount.
- Alcohol. A bar meaningfully increases restroom use; size up 15–25%.
- Meal service. A seated dinner concentrates use around certain moments (cocktail hour, after dinner), so peak capacity matters, not just the average.
- Guest mix. More stalls serve a broad guest list better and keep lines even.
- Formality. At an upscale wedding, guests visit the restroom more often to freshen up — comfort capacity beats bare-minimum math.
- Remote venues. At an off-grid site, the trailer's onboard fresh-water tank is the practical limit for a single day, which is another reason to size correctly. Self-contained trailer guide →
Why sizing up slightly is worth it
Undersizing to save a little money is the one restroom decision guests actually notice — a line at the reception is the opposite of the experience you're paying for. Going one size up is inexpensive relative to the rest of a wedding budget and removes the risk entirely. When in doubt, round up.
Wasatch Water Closets will confirm the right size for your exact guest count, event length, and venue when you check your date. Get a sizing recommendation → · (801) 699-3826
FAQ
How many restrooms do I need for a 150-person wedding?
About two stalls for a shorter event, or three for a long reception with a bar. A 2- or 3-stall luxury trailer covers a 150-guest wedding comfortably.
How many restrooms for 200 guests?
Roughly three stalls (a 3-stall trailer) for a standard event, or a 3-stall plus overflow — or two trailers — for a long, all-night reception.
What's the rule for restrooms per guest?
A common planning rule is one stall per 75 guests for events under four hours, increased by 15–25% for longer or alcohol-served events.
Is a restroom trailer measured in stalls or toilets?
By stalls — each stall is a private room with a toilet (and usually a sink). Trailers are described by their number of stalls or "stations," such as 2-stall or 3-stall.
Do longer events need more restrooms?
Yes — event length is a major factor. The same guest count over eight hours needs more capacity than over three, because guests make more trips.
See the full guide to choosing a restroom trailer in Salt Lake City & Park City →
Get a sizing recommendation for your event.
Get a sizing recommendationA real person answers · 801-699-3826