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Toilet Calculator — Portable Loos for Events

Calculate how many portable toilets you need for your outdoor event.

How We Calculate This

This calculator estimates portable toilet quantities using the provision ratios in the Purple Guide (Events Industry Forum), the recognised UK guidance for outdoor-event sanitation.

Provision ratios (Purple Guide)

  • Under 6 hours: 1 female WC per 100 women; 1 male WC per 500 men plus 1 urinal per 150 men
  • 6 hours or more, little or no alcohol/food: 1 female WC per 85 women; 1 male WC per 425 men plus 1 urinal per 125 men
  • 6 hours or more, alcohol and food in quantity: 1 female WC per 75 women; 1 male WC per 400 men plus 1 urinal per 100 men

The Purple Guide accounts for alcohol by moving a longer event up to the higher-provision tier, not by applying a fixed percentage. The calculator splits guests by gender, then adds at least 1 accessible unit (plus a further unit per 250 guests) and handwashing (Purple Guide guidance for single portable units is around 1 basin per 5 facilities, and never fewer than 1 per 10 toilets). A minimum of 2 standard cubicles is always provided.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Adjust quantities based on your guests and event type.