The short answer is: don’t try to calculate one number for the whole campus. Break the campus into zones, estimate the waste each zone produces, and then size the bins around capacity, foot traffic, and how often they get emptied. That will give you a much more realistic plan than copying a standard ratio.
Start by walking the campus and mapping it into zones: main walkways, building entrances, dining areas, dorms, sports facilities, transit stops, parking lots, and quiet lawns. In each zone, count the existing bins and note how full they get between collections. A simple three-day waste audit helps a lot. Check bins at the same times each day, weigh or estimate the waste, and record any overflowing bins. Also note where people naturally stop, sit, eat, or wait, because those are the spots that need bins most.
Next, get two numbers from your facilities or waste hauler: the capacity of your typical bin, usually in liters or gallons, and how many times per week each location is serviced. Then use a simple planning formula:
Required bins = daily waste volume × peak traffic factor ÷ (bin capacity × target fill level × collections per day)
For example, if a zone produces 300 liters of waste on a busy day, your bin holds 100 liters, you want bins no more than 80% full before collection, and the zone is serviced once per day, then: 300 × 1.2 ÷ (100 × 0.8 × 1) = about 4.5, so plan for 5 bins. Add a 10–20% buffer for events, exam weeks, and unusual peaks.
Use spacing only as a sanity check, not as your main method. High-traffic paths and building entrances may need bins every 30–50 meters, medium-traffic areas every 50–100 meters, and low-traffic areas every 100–200 meters or at key decision points. Also separate recycling and landfill bins where food and drinks are common, and make sure bins are accessible for cleaning crews and people with disabilities.
Finally, pilot the plan in two or three zones for a couple of weeks. Track overflow, contamination, and collection time, then adjust. The right number is the number that keeps bins from overflowing without creating an unnecessary collection burden.