How many porta potties for your party?

Start with 1 standard unit per 50 guests for a 4-hour party.

Serving beer or wine?

Add 1 unit per 100 guests. Minimum +1.

Longer than 4 hours?

Add 1 unit per 100 guests for every extra 2 hours.

Food on the table?

Add 1 hand-washing station for every 2–3 toilets.

Example: 100 guests, 4 hours, beer

2 base + 1 for alcohol = 3 units. Use the free calculator.