Free Calculator
How Many Portable Toilets Do I Need?
Enter your details below and get an instant recommendation based on WorkSafeBC requirements and industry guidelines. Then call us for an exact quote.
Portable Toilet Calculator
How the Calculator Works
Our portable toilet calculator uses industry-standard guidelines and WorkSafeBC regulations to estimate how many units your project or event needs. Here is the logic behind the numbers:
Construction Sites & Agriculture
WorkSafeBC OHS Regulation Part 4, Section 4.85 requires a minimum of 1 toilet per 10 workers on a construction site or agricultural workplace. The calculator divides your worker count by 10 and rounds up. A site with 15 workers needs 2 units. A site with 25 workers needs 3 units.
For construction sites with 25 or more workers, the October 2024 amendment encourages flush-type portable toilets. Whether flush units are required depends on site conditions and inspector discretion. Read the full WorkSafeBC requirements.
Events & Weddings
The industry standard for event portable toilet planning is 1 unit per 50 guests for a 4-hour event. The City of Kelowna recommends 1 per 100 people for public events, but the 1-per-50 guideline provides a better guest experience.
The calculator adjusts for event duration: events longer than 4 hours need more units because each toilet accumulates more use over time. A 6-hour event needs approximately 25% more units than a 4-hour event with the same guest count.
Alcohol Adjustment
Alcohol increases washroom usage by approximately 20%. If your event includes an open bar, wine service, or beer garden, the calculator adds 20% to the recommended unit count. This is based on industry data showing higher usage rates at events with alcohol.
ADA-Accessible Units
For any event or site with 100+ guests or workers, the calculator recommends at least 1 ADA-accessible unit. This is both a best practice for inclusivity and may be required under municipal accessibility guidelines or WorkSafeBC regulations if any attendee or worker has a mobility impairment.
Quick Reference Tables
Construction Sites (WorkSafeBC)
| Workers | Standard Units | Type Required | Est. Cost/Month |
|---|---|---|---|
| 1–10 | 1 | Standard | $150 |
| 11–20 | 2 | Standard | $300 |
| 25–30 | 3 | Flush* | $450+ |
| 31–50 | 4–5 | Flush* | $600–750+ |
Events (Industry Standard)
| Guests | 4-Hour Event | With Alcohol | ADA Units |
|---|---|---|---|
| 50 | 1 | 2 | 0 |
| 100 | 2 | 3 | 1 |
| 150 | 3 | 4 | 1 |
| 200 | 4 | 5 | 1 |
| 500 | 10 | 12 | 1–2 |
*Flush-type units recommended per October 2024 WorkSafeBC amendment for sites with 25+ workers. Compliance assessed at inspector’s discretion.
Learn More
Detailed guides for your specific use case.
Frequently Asked Questions
How many portable toilets do I need per person?
For events, the standard is 1 portable toilet per 50 guests for a 4-hour event. For construction sites, WorkSafeBC requires 1 toilet per 10 workers. If alcohol is being served at an event, add approximately 20% more capacity. These are minimums — more units mean shorter wait times.
Does alcohol increase the number of portable toilets needed?
Yes. Alcohol increases washroom usage by approximately 20%. If you are hosting an event with an open bar or beer/wine service, plan for 20% more portable toilets than you would for a non-alcohol event. Our calculator automatically factors this in when you select "Yes" for alcohol.
Do I need an ADA-accessible portable toilet?
For events with 100 or more attendees, at least one ADA-accessible unit is recommended and may be required under municipal accessibility guidelines. For construction sites, an ADA unit is required if any worker has a mobility impairment. Our calculator automatically adds an ADA recommendation for larger events.
How does event duration affect the number of portable toilets needed?
Longer events need more units because each toilet gets more use over time. The baseline of 1 per 50 guests assumes a 4-hour event. For events lasting 6–8 hours, increase by 25–50%. For all-day events (8+ hours), consider doubling the baseline or scheduling mid-event servicing.
Is the calculator recommendation a guaranteed quote?
No — the calculator provides an estimate based on industry guidelines and WorkSafeBC requirements. Your actual needs may vary depending on your specific venue, event format, and guest demographics. Call 250-808-7867 for a firm quote based on your specific situation.
Need a Firm Quote?
The calculator gives you an estimate. Call us for exact pricing based on your specific needs.