Sizing guide
How Many Porta Potties Do You Need?
How many porta potties you need depends on guests, hours, alcohol and food — or, on a job site, crew size. Use the calculator, then check the tables.
Live answer Mon–Sat, 7 AM to 7 PM. Written quotes back in about 15 minutes. Updated
Delivery area
Every unit count ships anywhere in our 22-city area.
Arrival
Big orders (10+ units) need 2–3 days' notice; small orders can go same day.
Which unit
Guests × hours ÷ 250 = standard units; +1 per 4 with alcohol.
Cleaning
Events over 8 hours get a mid-event pump-out; crews get weekly service.
Full cost
Count × unit price + one delivery fee + tax.
- Same dayCall by 12 PM, Mon–Sat
- WeeklyService included on 28-day rentals
- 22 cities5 North Texas counties
- All-inNo fuel or removal fees
- Local yard207 W Erwin Ave, McKinney
How many porta potties do I need for my event?
Use this rule: guests × hours ÷ 250, rounded up. A 150-guest, 5-hour wedding needs 3 standard units (150 × 5 = 750; 750 ÷ 250 = 3). If a bar is open, add 1 unit for every 4, so the wedding needs 4. Then make 1 of the 4 wheelchair-accessible.
| Guests | 2 hours | 4 hours | 6 hours | 8 hours |
|---|---|---|---|---|
| 25 guests | 1 | 1 | 1 | 1 |
| 50 guests | 1 | 1 | 2 | 2 |
| 100 guests | 1 | 2 | 3 | 4 |
| 150 guests | 2 | 3 | 4 | 5 |
| 200 guests | 2 | 4 | 5 | 7 |
| 300 guests | 3 | 5 | 8 | 10 |
| 500 guests | 4 | 8 | 12 | 16 |
| 1000 guests | 8 | 16 | 24 | 32 |
How many extra units do I add for alcohol, food or kids?
Add 1 unit for every 4 units when alcohol is served, with a minimum of 1. Add 1 hand wash station for every 4 units when food is served. For events with many young kids, add a deluxe unit with a sink or a hand wash station near the play area. These are whole-number steps, not percentages.
| If… | Then add | Worked example (4-unit base) |
|---|---|---|
| Beer, wine or a full bar | 1 unit per 4 (min 1) | 4 → 5 units |
| Food served | 1 hand wash station per 4 units (min 1) | +1 station |
| Event over 8 hours | A mid-event service visit ($55) | Tank pumped at the halfway point |
| 2+ units grouped together | At least 5% wheelchair-accessible (min 1) | 1 of 5 accessible |
How many porta potties does a job site need?
OSHA's legal minimum is 1 toilet for 20 or fewer workers, then 1 toilet seat and 1 urinal per 40 workers, and per 50 workers at 200 or more (29 CFR 1926.51 Table D-1). Our recommendation is about 1 standard unit per 10 workers on a 40-hour week with weekly service.
| Workers | OSHA legal minimum | Our recommendation (weekly service) | Or with twice-weekly service |
|---|---|---|---|
| 1–10 | 1 | 1 | 1 |
| 11–20 | 1 | 2 | 1 |
| 21–40 | 1 seat + 1 urinal | 3–4 | 2 |
| 41–80 | 2 seats + 2 urinals | 5–8 | 3–4 |
| 81–120 | 3 seats + 3 urinals | 9–12 | 5–6 |
| 200 | 4 seats + 4 urinals (per 50) | 20 | 10 |
More on construction site toilets and service schedules and OSHA porta potty rules in Texas.
How many wheelchair-accessible units do I need?
At least 5% of the portable toilets in each cluster must be accessible, and never fewer than 1, under section 213.2 of the 2010 ADA Standards. A cluster of 2 to 20 units needs 1 accessible unit; 21 to 40 units need 2. Our accessible units have a 60-inch-diameter turning space inside.
| Units in one cluster | Accessible units required |
|---|---|
| 2–20 | 1 |
| 21–40 | 2 |
| 41–60 | 3 |
| 61–80 | 4 |
Source: U.S. Access Board, 2010 ADA Standards §213. Ask your venue or permit office for local rules. See the wheelchair-accessible unit for dimensions.
How many units for a farm or harvest crew?
Farm employers need 1 toilet and 1 handwashing facility for every 20 field workers, within a quarter-mile walk, under OSHA 29 CFR 1928.110. A 45-worker harvest crew therefore needs 3 toilets and 3 handwashing facilities. Towable units help when crews move across large fields.
Read the rule at osha.gov 1928.110 and see seasonal and farm rentals.
Sizing questions
Straight answers from the dispatch desk. Not covered here? Call (469) 326-5635.
Where does the 250 guest-hours number come from?
It is our dispatch method: a 60-gallon tank handles about 200–250 uses, and guests use the restroom about once every 1–2 hours. Industry charts used by portable sanitation companies land on similar counts.
Do more women guests change the count?
Yes. Women use a unit longer and more often than men. For mostly-female events like showers, add 1 unit to the result.
Can I rent fewer units and add service?
On long events, yes. A mid-event pump-out lets 3 units do the work of 4 on a 10-hour day.
Should the accessible unit be separate from the others?
Put it in the same cluster on firm, level ground with a clear path. Rule 213.2 counts units per cluster.
Book the count you just calculated
Calling is the fastest way to book. Justin's dispatch desk at 207 W Erwin Ave answers Mon–Sat 7 AM–7 PM, checks the route for your ZIP while you're on the phone and reads you the full price before you pay.
(469) 326-5635- Local yard in McKinney, not a call center
- All-in quote: unit, delivery, pickup and servicing
- No fuel surcharge, no removal fee