How many porta potties do I need for my event?
Plan 1 standard porta potty per 50 guests for an event up to 4 hours. Multiply by 1.5 for events up to 6 hours, by 2 up to 8 hours, and by 2.5 over 8 hours, then round up. A 100-guest, 4-hour party needs 2 porta potties before any adjustments.
The calculator uses the same rules as this page. Change guests, hours, alcohol and food, and the count updates. Then tap “Quote this” and the number carries into the quote form.
| Guests | Up to 4 hours | Up to 6 hours (×1.5) | Up to 8 hours (×2) | Over 8 hours (×2.5) |
|---|---|---|---|---|
| 50 | 1 | 2 | 2 | 3 |
| 75 | 2 | 3 | 3 | 4 |
| 100 | 2 | 3 | 4 | 5 |
| 150 | 3 | 5 | 6 | 8 |
| 200 | 4 | 6 | 8 | 10 |
| 250 | 5 | 8 | 10 | 13 |
| 300 | 6 | 9 | 12 | 15 |
| 500 | 10 | 15 | 20 | 25 |
Do I need more porta potties if alcohol is served?
Yes. Add 1 porta potty for every 4 units when alcohol is served, and round up. Guests who drink use the restroom more often. A 150-guest, 5-hour wedding needs 5 units by the base rule, and the bar adds 2 more for a total of 7 porta potties.
The math is simple: take your base count, divide by 4, round up, and add that number. 5 ÷ 4 = 1.25, which rounds up to 2. So 5 + 2 = 7.
How many wheelchair-accessible porta potties do I need?
Make at least 5% of the porta potties in each cluster wheelchair-accessible, and never fewer than 1 per cluster. That rule comes from the 2010 ADA Standards, §213.2. An event with 7 standard units needs 1 wheelchair-accessible unit: 7 × 5% = 0.35, which rounds up to 1.
Read the rule yourself in the 2010 ADA Standards, §213.2 (U.S. Access Board). A “cluster” is any group of units in one spot. If you set restrooms at both ends of a park, each group needs its own accessible unit.
Our wheelchair-accessible units have ground-level entry, a wide door, grab bars and a 60-inch turning space. They are built to ADA design guidelines — confirm what your venue requires. Book them 7–10 days ahead; see wheelchair-accessible unit details.
How many handwashing stations do I need with porta potties?
Plan at least 1 handwashing station for every 4 porta potties when food is served, with a minimum of 1. Each Brian Rental Works station is two-sided, so 2 people wash at once. An event with 7 toilets needs 2 stations: 7 ÷ 4 = 1.75, which rounds up to 2.
Standard porta potties come with hand sanitizer inside but no sink. If guests are eating with their hands — tacos, fajitas, barbecue — soap and water matter. Set stations near the food line and near the toilets. See handwashing station rentals.
Not sure your count is right? We’ll check it on the call
Give us guests, hours and whether there’s a bar. We confirm the count and text an itemized quote in about 15 minutes.
How many porta potties does a farm field crew need?
OSHA 29 CFR 1928.110 requires 1 toilet and 1 handwashing facility per 20 hand-labor field workers once a crew reaches 11 or more. Both must be within a quarter-mile walk. A 45-person citrus crew needs 3 toilets and 3 handwashing facilities: 45 ÷ 20 = 2.25, rounded up to 3.
Source: OSHA 29 CFR 1928.110 field sanitation (eCFR). Crews whose work, including travel, lasts 3 hours or less are exempt. Citrus, sugarcane and onion harvests run from fall into spring in the Valley. See farm and field crew toilets.
How many porta potties does a large Hidalgo County gathering need?
Hidalgo County’s mass gathering policy asks for 1 toilet seat per 50 people at outdoor gatherings of 2,500 or more lasting over 5 hours in unincorporated areas. Units must be marked Men and Women, with handwashing nearby. A 3,000-person gathering needs at least 60 toilet seats.
That number is a legal minimum, not a comfort target. Our event rule for 3,000 people over 8 hours would be closer to 120 units. Start the county application at least 45 days ahead — see the Edinburg event permit guide and festival porta potty planning.
What are worked examples for counting porta potties?
Five worked examples show the full math with whole numbers. A 75-guest birthday needs 2 units and 1 station. A 150-guest wedding with a bar needs 7 units, 1 accessible unit and 2 stations. A crew of 45 needs 5 serviced units, and a 45-person harvest crew needs 3.
| Situation | Step-by-step math | Order |
|---|---|---|
| Birthday, 75 guests, 4 hours, food, no alcohol | 75 ÷ 50 = 1.5 → 2 units. Food: 2 ÷ 4 = 0.5 → 1 station. | 2 standard + 1 handwashing station |
| Wedding, 150 guests, 5 hours, bar and food | 150 ÷ 50 = 3 × 1.5 = 4.5 → 5. Alcohol: 5 ÷ 4 = 1.25 → +2 = 7. Accessible: 7 × 5% = 0.35 → 1. Food: 7 ÷ 4 = 1.75 → 2. | 7 standard + 1 wheelchair-accessible + 2 stations |
| Church festival, 300 guests, 8 hours, food | 300 ÷ 50 = 6 × 2 = 12. Accessible: 12 × 5% = 0.6 → 1. Food: 12 ÷ 4 = 3. | 12 standard + 1 wheelchair-accessible + 3 stations |
| Commercial crew of 45 | OSHA: 45 ÷ 40 = 1.125 → 2 seats + 2 urinals. Ours: 45 ÷ 10 = 4.5 → 5. Handwash: 5 ÷ 4 = 1.25 → 2. | 5 standard units + 2 stations, weekly service |
| Citrus harvest crew of 45 | OSHA 1928.110: 45 ÷ 20 = 2.25 → 3 toilets + 3 handwashing facilities. | 3 standard + 3 stations within a ¼-mile walk |
Method: our dispatch rule of thumb for events (1 per 50 guests, time multipliers, alcohol and handwash adjustments), plus official tables: 2010 ADA Standards §213.2, OSHA 29 CFR 1926.51 and 1928.110, and the Hidalgo County mass gathering policy. Always round up.