Quick examples for a four-hour event
| Guests | No alcohol | Alcohol served |
|---|---|---|
| 50 | 1 toilet | 2 toilets |
| 100 | 2 toilets | 3 toilets |
| 150 | 3 toilets | 4 toilets |
| 250 | 5 toilets | 6 toilets |
| 500 | 10 toilets | 12 toilets |
Turn the estimate into a rental plan.
Tell us about existing restrooms, peak-use breaks, children, staff, food vendors and how the site is laid out. A distributed event may need more than one restroom cluster. A reception with a simultaneous break can need additional capacity even when total attendance is modest.
The calculation above is our website’s event-planning assumption, not a measured tank-use rate. It starts the conversation. We help select equipment and service based on your actual event.
Plan accessible units and handwashing separately.
Decide where accessible facilities belong within each cluster, and include a usable route and washing facilities. Our accessible rental guide explains the unit sizes and public-event planning considerations. Our handwashing guide helps plan sinks and refills.
Construction and agricultural sites use different rules.
For workers, use the relevant California requirements and actual crew arrangements rather than this guest calculator. See our construction sanitation page and agricultural rental guide.
Need a trailer instead?
Trailer station count, tank capacity and servicing need to be matched to the event. Send us the guest count, hours, space, water and power information, and we’ll compare the trailer options with individual portable units.