How many porta potties do I need for my event?

The industry rule of thumb is 1 porta potty per 50 guests for a 4-hour event. Add roughly 15–20% more units when alcohol is being served, and add another unit for every additional 4 hours of duration. Multi-day events should plan one unit per 50 guests per day with daily servicing.

How many porta johns are required on a construction site?

OSHA requires 1 portable toilet per 10 workers on a 40-hour week. Crews running longer hours, or sites without nearby restrooms, may need additional units plus weekly (or twice-weekly) servicing.

How does alcohol affect porta potty count?

When alcohol is served, plan on 15–20% more units than a standard event of the same size. Guests use restrooms more frequently, so the math shifts upward.

How many handwash stations do I need?

Plan on 1 handwash station per 2 porta potties at minimum, or per 50–100 guests at events that include food service.

Do longer events need more units or more servicing?

Both. Events over 4 hours need additional units. Multi-day events also need daily servicing (pumping, restocking) so units stay clean and odor-free.

How accurate is this calculator?

It uses the same formulas event planners and OSHA reference. Final recommendations may vary based on venue layout, accessible-unit needs, and food service — call 219-333-7048 for an exact recommendation.

Do you offer restroom trailers?

Not at this time — we're focused on standard porta potty and porta john rentals across Northwest Indiana. Restroom trailers are on our roadmap for the future. In the meantime, our wheelchair-accessible units and clean, late-model standard units handle weddings, festivals, and large events beautifully. Call 219-333-7048 if you'd like a recommendation.

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Porta Potty Calculator — How Many Do I Need?

How many porta potties (or porta johns) do you actually need? Tell us about your event or job site below — we'll do the math, then send you a free quote in Northwest Indiana.

Free porta potty and porta john calculator using the same rules event planners and OSHA reference: 1 unit per 50 guests for a 4-hour event, +20% for alcohol, and 1 unit per 10 workers on construction sites. Sized in about 60 seconds for any event or jobsite in Northwest Indiana — call 219-333-7048 to confirm the recommendation.

Your event

Tell us about it

Event mode — short-term weekend or party rental. Priced per unit, Friday drop / Monday pickup typical, delivery & pre-drop servicing included.

Guest count100

Hours per day4h

Number of days1 day

Wheelchair-accessible units0

Spacious, ground-level units for wheelchair users. Adds +$75/unit per 28-day period on top of the base rental ($150–$225/unit). Recommended: 1 accessible unit per 20 standard units, minimum 1 for public events.

You need

2porta potty units

For 100 guests over 4 hours, the event formula recommends 2 porta potty units.

Estimated price

$300 – $450

Estimate only. Call 219-333-7048 for an exact local quote.

Why our pricing — what's included

Some quotes look cheaper because they leave things out. Every Potty Rentals estimate includes:

Delivery & pickup — local NWI driver, on time, no hidden trip fees
Motion-activated LED solar lights — every standard unit, no upcharge. Most competitors don't include this.
Foaming hand sanitizer in every standard unit, plus full servicing — pumped, restocked (TP) and sanitized before delivery
Clean, late-model units — not the rusty unit your cousin's friend showed up with
Local support — text or call the owner directly, not a national call center

Need built-in handwash sinks? Toggle sink upgrade above (+$40/unit). Multi-day events needing extra cleaning trips use our tiered rate ($35–$100/unit/day).

2 clean porta potty / porta john units with LED lights & foaming hand sanitizer
1 handwash station (recommended)
Weekend / short-term rental: $150–$225 per unit — Friday drop, Monday pickup typical, delivery & servicing included
Delivery, pickup & pre-drop servicing included
Standard event sizing
Need a wheelchair-accessible unit? Set the count below to add it to your estimate

Get my exact quote Call 219-333-7048

How the math works

The formulas behind the calculator

No fluff — here's exactly what we use to recommend porta potty and porta john counts.

Events & weekend rentals

1 porta potty per 50 guests for a 4-hour event. Add ~15% per extra hour over 4 hours. Priced as a single weekend rental — Friday drop, Monday pickup is the standard window.

Construction & long-term

1 portable toilet per 10 workers on a 40-hour work week. Billed per unit, per 28-day period, with weekly pumping and restocking included.

Adjustments

Events: +20% when alcohol is served, +1 handwash per 2 units when food is served. Construction: step up to daily cleaning trips for high-traffic sites.

Common questions

How many porta potties do I need for my event?: The industry rule of thumb is 1 porta potty per 50 guests for a 4-hour event. Add roughly 15–20% more units when alcohol is being served, and add another unit for every additional 4 hours of duration. Multi-day events should plan one unit per 50 guests per day with daily servicing.
How many porta johns are required on a construction site?: OSHA requires 1 portable toilet per 10 workers on a 40-hour week. Crews running longer hours, or sites without nearby restrooms, may need additional units plus weekly (or twice-weekly) servicing.
How does alcohol affect porta potty count?: When alcohol is served, plan on 15–20% more units than a standard event of the same size. Guests use restrooms more frequently, so the math shifts upward.
How many handwash stations do I need?: Plan on 1 handwash station per 2 porta potties at minimum, or per 50–100 guests at events that include food service.
Do longer events need more units or more servicing?: Both. Events over 4 hours need additional units. Multi-day events also need daily servicing (pumping, restocking) so units stay clean and odor-free.
How accurate is this calculator?: It uses the same formulas event planners and OSHA reference. Final recommendations may vary based on venue layout, accessible-unit needs, and food service — call 219-333-7048 for an exact recommendation.
Do you offer restroom trailers?: Not at this time — we're focused on standard porta potty and porta john rentals across Northwest Indiana. Restroom trailers are on our roadmap for the future. In the meantime, our wheelchair-accessible units and clean, late-model standard units handle weddings, festivals, and large events beautifully. Call 219-333-7048 if you'd like a recommendation.