Restroom Calculator

Restroom Calculator Restrooms needed for Construction Sites:

# of Employees Minimum number of Portable Restroom Facilities
1 - 10 1
11 - 20 2
21 - 30 3
31 - 40 4
Over 40 1 additional facility for each 10 additional employees

Restrooms needed for Special Events Under normal conditions most people will use sanitation facilities once every four hours.

Take into consideration that the consumption of food, liquids, beer, and other alcoholic beverages will increase usage by 30-40%. Use these tables as a guide—then give us a call.

How to use this chart:

  1. 1. Determine how many hours the event will last, if it is multiple days use the longest day.
  2. 2. Determine how many people will attend, if there are multiple days determine the peak day.
  3. 3. Use the chart to calculate the number of portable restrooms needed for adequate sanitation conditions. Note: If alcohol is being served, add 15-20% more restrooms.

    4. —Add one Extra-large Restroom per 20 portable restrooms, or a minimum of one for events open to the public.

    —Adequate hand washing should also be provided with restrooms in all food service areas.

    Length of Event (in hours)
    Peak
    Crowd    		 1 2 3 4 5 6 7 8 9 10
    250 2 2 2 2 2 3 3 3 3 3
    500 2 3 3 4 4 4 4 4 4 5
    1000 3 4 5 6 7 7 7 7 7 7
    2000 5 8 10 11 12 13 13 14 14 14
    3000 7 12 15 16 18 18 19 20 20 21
    4000 10 16 19 22 24 25 25 27 27 28
    5000 12 20 24 27 29 31 32 33 33 34
    6000 14 24 28 33 35 37 37 39 41 41
    7000 17 27 34 38 41 42 46 46 47 48
    8000 20 32 38 44 48 49 50 51 53 54
    10,000 24 39 47 54 58 62 64 66 67 68
    12,500 30 48 61 68 73 78 80 81 82 85
    15,000 37 57 70 81 87 92 94 99 102 104
    17,500 42 68 84 95 100 110 111 113 116 118
    20,000 48 77 95 107 115 120 127 131 133 136
    25,000 60 96 122 133 146 156 159 162 165 171
    30,000 73 114 141 163 174 184 188 194 197 201
    40,000 95 156 188 217 231 243 249 257 266 271
    50,000 120 192 238 267 290 305 312 322 330 337
    75,000 177 292 357 403 432 455 470 485 491 508
    100,000 239 378 475 515 542 562 583 593 620 633