Eliminate the Guesswork: How Many Portable Toilets Do You Need?

There are few things less desirable than waiting in line to use a portable toilet. The ZTERS' portable toilet calculator helps our customers start the rental process with confidence. With an informed rental, guests aren’t forced to wait in long lines or our customers don’t end up paying for unnecessary units.

So how many toilets do you need? As a general rule, we recommend 1 toilet per 25 people, but there is no one-size-fits-all situation. Instead of guessing, use the calculator drawing from our decades of experience to calculate exactly how many portable toilets you need.




how long will your event last? (approximately)

how long will your project last? (approximately)


how many people will be at your event?

Select how many people you expect will be at your event


how many shifts will be on-site? (40hrs)




Estimated number
of portable toilets

Let’s take it a step further! Now that you know how many portable toilets you need, easily request a quote. Here is a summary of your portable toilet needs:

Occasion -
Event Time -
People Anticipated -
Alcohol Served -
Suggested Toilets -

Call 877-893-7743 for your quote.

portable toilet rental

Call 877-893-7743

for a free consultation or quote.

Common Examples

  • Portable Toilets Needed For a Wedding

    People commonly ask how many portable toilets are needed at weddings especially given the popularity of outdoor weddings. It’s important to keep in mind that whenever alcohol is involved, there’s a higher need for restrooms. Plan for one wedding portable toilet per 25 guests.

    ADA-compliant portable toilets are often a go-to for weddings since they are spacious enough to accommodate families, people with limited mobility, and bridal guests in flowy gowns.

    We recommend booking wedding portable toilets well in advance, especially in the spring and summer seasons. If possible, secure your rental at least 2-3 months before the wedding to ensure you get exactly what you’re looking for ahead of time.

  • Portable Toilets Needed for Construction Sites

    When renting construction portable toilets, you need to comply with OSHA law dictating the number of portable toilets per construction worker. ZTERS calculator accounts for OSHA law and our account reps can identify local ordinances in your area.

    For health and sanitary purposes, the required number of construction portable toilets is:

    • One toilet for up to 20 employees
    • One toilet seat and one urinal per 40 workers for over 20 employees
    • One toilet seat and one urinal per 50 workers for over 200 employees

    Due to the high volume of usage, construction portable toilets should be cleaned once a week. If weekly service isn’t feasible, we recommend renting additional toilets.

ZTERS Construction and Event Portable Toilet Solutions

  • From weddings to construction sites to outdoor festivals, ZTERS provides accurate calculations for how many portable toilets you need. No more guesswork necessary. Get your suggested number of portable toilets in minutes and call us for a free quote.