Updated · Reviewed by the Brandon Rental Works dispatch team
Sizing guide · Brandon Rental WorksHow Many Porta Potties Do I Need? Charts, Math & a Calculator
- How many porta potties: 1 standard unit per 50 guests for an event up to 4 hours; 1 per 35 for 4–8 hours; 1 per 25 beyond 8 hours.
- Add units for alcohol and mostly-female crowds, and 1 hand-wash station for every 2 toilets when food is served — use the calculator.
- We deliver across Denton County and Collin, Dallas and Tarrant County cities — check your ZIP.
- Same-day delivery when you call by noon, Mon–Sat. Event units arrive pumped, sanitized and stocked; jobsite units get weekly service.
- Your quote is itemized: units, days, servicing, delivery, pickup, fees and tax, all before you pay.
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How many porta potties do I need for my event?
Most events need 1 standard porta potty for every 50 guests if the event lasts 4 hours or less. A 4–8 hour event needs 1 unit per 35 guests, and anything over 8 hours needs 1 unit per 25 guests. Always round up. Then add units for alcohol, a mostly-female crowd, hand washing and accessibility.
Type your guest count into the calculator. It runs the same steps our dispatchers use on the phone. The steps are written out below so you can check the math yourself.
Event porta potty calculator
Method: Brandon Rental Works house rule — 1 unit per 50 guests up to 4 hours, 1 per 35 for 4–8 hours, 1 per 25 beyond 8 hours, always rounded up; accessible count from 2010 ADA Standards §213.2 (5%, minimum 1).
What formula does Brandon Rental Works use to size porta potties?
Brandon Rental Works sizes events with a 5-step house method. Step 1 divides guests by 50, 35 or 25 depending on event length. Step 2 adds 1 unit per 100 guests for alcohol. Step 3 adds 1 unit per 100 guests for a mostly-female crowd. Step 4 sets 5% accessible units. Step 5 adds hand-wash stations.
- Base count. Divide guests by 50 (up to 4 hours), 35 (4–8 hours) or 25 (over 8 hours). Round up to a whole unit.
- Alcohol. If alcohol is served, add 1 unit for every 100 guests, rounded up. The minimum is +1.
- Mostly-female crowd. For weddings, showers and similar events, add 1 unit for every 100 guests, rounded up.
- Accessibility. Make at least 5% of the units in each cluster wheelchair-accessible, with a minimum of 1.
- Hand washing. If food is served, add 1 hand-wash station for every 2 toilets, rounded up. The minimum is 1.
How many porta potties do I need by guest count and event length?
A 100-guest event needs 2 standard porta potties for up to 4 hours, 3 units for 4–8 hours and 4 units for over 8 hours. A 500-guest event needs 10, 15 or 20 units for the same lengths. The chart below shows the base count only, before alcohol, crowd, food and accessibility adjustments.
| Guests | Up to 4 hours (÷ 50) | 4–8 hours (÷ 35) | Over 8 hours (÷ 25) |
|---|---|---|---|
| 25 | 1 | 1 | 1 |
| 50 | 1 | 2 | 2 |
| 75 | 2 | 3 | 3 |
| 100 | 2 | 3 | 4 |
| 150 | 3 | 5 | 6 |
| 200 | 4 | 6 | 8 |
| 250 | 5 | 8 | 10 |
| 300 | 6 | 9 | 12 |
| 400 | 8 | 12 | 16 |
| 500 | 10 | 15 | 20 |
| 750 | 15 | 22 | 30 |
| 1,000 | 20 | 29 | 40 |
Use your peak headcount, not the total RSVP list spread over the day. If 300 people come and go but only 150 are there at once, size for the 150 who are there together. For festivals, use the busiest day.
How many extra porta potties do I need for alcohol, food and accessibility?
Add 1 porta potty for every 100 guests when alcohol is served, and another 1 per 100 guests for a mostly-female crowd. Add 1 hand-wash station for every 2 toilets when food is served. Make 5% of units in each cluster wheelchair-accessible, with at least 1 accessible unit per cluster.
| Guests | Alcohol: add | Mostly female: add | Accessible units (per cluster) |
|---|---|---|---|
| 25–100 | +1 | +1 | 1 of every 1–20 units |
| 101–200 | +2 | +2 | 2 when a cluster has 21–40 units |
| 201–300 | +3 | +3 | 3 when a cluster has 41–60 units |
| 301–500 | +4 to +5 | +4 to +5 | 5% of the cluster, rounded up |
| 501–1,000 | +6 to +10 | +6 to +10 | 5% of the cluster, rounded up |
Hand-wash stations when food is served
Count all toilets after the alcohol and crowd steps. Divide by 2 and round up. 3 toilets need 2 stations; 7 toilets need 4. Each hand-wash station is a PolyJohn Bravo with 2 foot-pump sinks, soap and paper towels.
Wheelchair-accessible units
The accessible unit is counted inside your total, not on top of it. Our wheelchair-accessible PolyJohn Comfort XL is 62 × 62 inches with a roll-in floor. It is designed to help meet the ADA 2010 Standards §213.2 counts; your venue or permit office makes the final call.
callers in our recorded call review asked for a sink or a hand-wash station (33%). Hand washing is the add-on people forget most, so the calculator adds it as soon as you tick "food served."
Source: 27 recorded porta potty rental calls reviewed by our office, 2026.How many porta potties do I need for a backyard party, a wedding or a festival?
A 45-guest, 4-hour backyard party with food needs 1 porta potty and 1 hand-wash station. A 150-guest, 6-hour wedding with a bar needs 9 toilets and 5 hand-wash stations. A 2,000-guest, 10-hour festival with beer needs 100 toilets and 50 hand-wash stations per day. Each example uses the same 5 steps.
Backyard birthday, 45 guests, 4 hours, food, no alcohol
- 45 ÷ 50 = 0.9 → 1 unit.
- No alcohol: +0.
- Mixed crowd: +0.
- Accessible: private home, your call (see note).
- Food: 1 toilet ÷ 2 = 0.5 → 1 hand-wash station.
Result: 1 standard unit + 1 hand-wash station. If beer is on the cooler, add 1 unit for 2 total. If the party stretches past 4 hours, 45 ÷ 35 = 1.3 → 2 units.
Wedding, 150 guests, 6 hours, bar and dinner
- 150 ÷ 35 = 4.3 → 5 units.
- Bar: 150 ÷ 100 = 1.5 → +2 = 7.
- Wedding crowd: +2 = 9 units.
- Accessible: 5% of 9 = 0.45 → 1 of the 9.
- Dinner: 9 ÷ 2 = 4.5 → 5 hand-wash stations.
Result: 8 standard or deluxe units + 1 wheelchair-accessible unit + 5 hand-wash stations. Many couples swap some units for a restroom trailer; see the wedding restroom guide.
Festival, 2,000 guests a day, 2 days, 10 hours, beer and food
- 2,000 ÷ 25 = 80 units.
- Beer: 2,000 ÷ 100 = +20 = 100.
- Mixed crowd: +0.
- 4 clusters of 25: 5% of 25 = 1.25 → 2 each = 8 accessible.
- Food: 100 ÷ 2 = 50 hand-wash stations.
Result: 92 standard + 8 wheelchair-accessible + 50 hand-wash stations, with service every night between days. See festival porta potties.
Notes on the examples
- House bathrooms. The method counts as if the rented units are the only restrooms. An open house bathroom is extra cushion at peak times, not a reason to cut the count.
- Private parties and accessibility. The §213.2 count is written for public facilities. At a private home it is your choice, but if a guest uses a wheelchair or walker, rent the accessible unit. The calculator shows 1 by default.
- Multi-day events. Units for 1–3 day events arrive clean and stocked and normally need no mid-event service. Festivals running 2 or more days get daily or nightly service, which we schedule after gates close.
- Clusters. If units stand in 2 or more separate spots, each spot is its own cluster and needs its own accessible unit.
recorded rental calls we reviewed were events or parties (63%), and 15 were single-day events. Most of those callers needed 1 or 2 units, which is what the method gives for 25–100 guests over 4 hours.
Source: 27 recorded porta potty rental calls reviewed by our office, 2026.
Have the number? Book the units now.
Tell dispatch the guest count, hours and ZIP. We confirm the count, the drop day and the pickup day in one call.
How many porta potties does OSHA require on a jobsite?
OSHA 29 CFR 1926.51(c) Table D-1 requires 1 toilet for 20 or fewer workers. A crew of 20 to 199 workers needs 1 toilet seat and 1 urinal per 40 workers. A crew of 200 or more needs 1 toilet seat and 1 urinal per 50 workers. Our standard PolyJohn PJN3 has both a seat and a urinal.
| Workers on site | OSHA minimum | Our recommendation |
|---|---|---|
| 1–10 | 1 toilet | 1 unit, weekly service (included) |
| 11–20 | 1 toilet | 1 unit, service 2× per week |
| 21–40 | 1 seat + 1 urinal | 2 units, weekly service each |
| 41–80 | 2 seats + 2 urinals | 3–4 units, weekly service each |
| 81–199 | 1 seat + 1 urinal per 40, rounded up | Call dispatch for a site plan |
| 200+ | 1 seat + 1 urinal per 50 | Call dispatch for a site plan |
Worked example: a framing crew of 28 workers. 28 is in the 20–199 band, so 28 ÷ 40 = 0.7 → 1 seat and 1 urinal. That is the legal minimum: 1 standard unit. We recommend 2 units on that site, because 28 people sharing 1 unit means lines at break time. Hand washing is a separate rule under 1926.51(f); a hand-wash station covers it.
Read the full rules and the legal fine print in our OSHA porta potty requirements guide, or see how construction site toilet rentals are billed and serviced.
OSHA jobsite toilet calculator
Source: OSHA 29 CFR 1926.51(c), Table D-1. Legal minimum shown; confirm site rules with your GC or permit office.
How many porta potties do farm workers need?
OSHA 29 CFR 1928.110 requires 1 toilet and 1 hand-washing facility for every 20 field workers, or fraction of 20. Both must be within a quarter-mile walk of where the crew works. A harvest crew of 35 workers needs 2 toilets and 2 hand-wash stations, moved along as the crew moves.
The field sanitation rule covers hand-labor work in the field. Read the official text at eCFR 29 CFR 1928.110 to see which crews it applies to. For crews spread across big pastures, a towable unit on a single-axle trailer keeps the quarter-mile walk short.
Worked example: 35 workers ÷ 20 = 1.75 → 2 toilets + 2 hand-wash stations. If the crew splits into two fields more than a quarter mile apart, each field needs its own set.
Which unit fits which count?
| Need | Unit |
|---|---|
| Most parties and crews | Standard PolyJohn PJN3 |
| Weddings, showers | Deluxe PolyJohn Fleet with sink |
| Public events, 5% per cluster | PolyJohn Comfort XL |
| Food served, farm crews | PolyJohn Bravo hand-wash station |
| Long fields, moving crews | Towable trailer-mounted unit |
What else changes how many porta potties I should rent?
Four things push the porta potty count above the chart: long lines at set breaks, hot weather, kids, and units split across 2 or more locations. A 300-guest event with one intermission behaves like a bigger crowd. Each separate cluster of units also needs its own wheelchair-accessible unit under §213.2.
Set breaks and halftimes
Ceremonies, games and concerts send everyone at once. If your event has a fixed break, size at the next row up on the chart.
Kids' parties
Kids go often and fast. A hand-wash station outside lets them wash without going back into the toilet, and that keeps the line moving.
Spread-out sites
Ranches, parks and barns may need units in two spots. Each spot is a cluster. Walk the site and tell dispatch how far apart guests will be.
Sell-out dates
Denton Arts & Jazz Festival weekend, UNT and TWU graduations and UNT home football Saturdays fill our calendar. Book 2–3 weeks ahead for those dates.
Once you have the count, see what drives the total in our porta potty rental cost guide.
Porta potty sizing questions from real callers
I'm having 40 to 50 people over. Is one porta potty enough?
Guests can still use my house bathroom. Do I need fewer units?
How many porta potties do I need for 100 guests?
How many porta potties do I need for 200 people?
Do I need a wheelchair-accessible porta potty for a private party?
How many porta potties do I need for 10 workers?
Does a deluxe unit with a sink count as a hand-wash station?
Ready to book? Call or get an itemized quote
Same-day delivery when you call by noon, Mon–Sat. Your quote lists the unit, rental length, servicing, delivery, pickup, fees and tax — before you pay.
- Locally owned yard at 302 Dallas Dr, Denton, TX 76205
- Driver calls or texts about 30 minutes before arrival
- Nobody needs to be home — mark the spot and we place it
- Weekend events: Friday drop, Monday pickup, no extra rental charge
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