Use the chart below to approximate how many units you might need for your event. Estimate the number of hours for the event, then find the estimated number of people attending in the first column – with this information, you can see on the chart the number of units needed.

Duration of Event
People
Attending		 1
Hr.		 2
Hrs.		 3
Hrs.		 4
Hrs.		 5
Hrs.		 6
Hrs.		 7
Hrs.		 8
Hrs.		 9
Hrs.		 10
Hrs.
Units Needed
1-50 1 1 1 1 2 2 2 2 2 2
50-100 2 2 2 2 2 3 3 3 3 3
100-250 3 3 3 3 4 4 4 6 6 6
250-500 4 4 4 4 6 6 8 8 8 8
500-1,000 4 5 6 7 7 8 8 8 9 9
2,000 6 10 12 13 14 14 14 15 15 15
3,000 9 14 17 19 20 21 21 21 21 22
4,000 12 19 23 25 28 28 28 30 30 30
5,000 15 23 32 32 34 36 36 36 36 36
6,000 17 28 34 38 40 42 42 42 42 42
7,000 20 32 40 44 46 48 50 50 50 50
8,000 23 38 46 50 54 57 57 57 57 57
10,000 30 46 57 63 66 69 69 72 72 72
12,500 18 31 47 63 78 94 109 125 141 156
15,000 20 38 56 75 94 113 131 150 169 188
17,500 22 44 66 88 109 131 153 175 197 219
20,000 25 50 75 100 125 150 175 200 225 250
The above chart is based upon a University of Missouri – St. Louis Study.
Contact Us
Top

Proud member of the Portable Sanitation Association International (PSAI)
www.psai.org