Waste Haul Truck Count Calculator

Fleet sizing for hauling is a cycle-time problem, not a volume problem. Each truck repeats a fixed loop of load, haul, dump and return, and the total loop duration is the cycle time. Divide the available shift minutes by the cycle time to get trips per truck per day, divide the total quantity by payload to get trips required, and the ratio of the two, rounded up, gives the fleet. The rounding matters: a job needing 25 trips at 6 trips per truck per day requires 5 trucks, and the fifth truck only runs a single trip, which is why fleet utilization in the results panel is often well below 100 percent. Payload is usually the binding constraint rather than box volume, since a tandem-axle dump body holding 14 cubic yards may legally carry only about 13 to 15 tons of wet soil under highway axle-weight limits. Realistic inputs matter more than the arithmetic. Loading a tandem dump with a 1.5 cubic yard excavator bucket typically takes 8 to 15 minutes, dumping and maneuvering at a transfer station or landfill face runs 5 to 10 minutes, and haul speed on urban routes rarely averages more than 25 to 30 mph. Effective shift length is also shorter than nominal: a 60-minute hour is commonly derated to 45 or 50 minutes for fueling, breaks and delays. The formula assumes deterministic average cycles, so it understates fleets on jobs with a single loading point, where trucks bunch and queue; when the number of trucks exceeds what the loader can serve, added trucks simply wait. Adding 15 to 25 percent contingency, or one standby unit, is standard practice.

Systematic estimation of earthmoving and haul production is a mid-twentieth-century development, driven by the shift from manual excavation to mechanized fleets and by the enormous scale of postwar highway work after the Federal-Aid Highway Act of 1956. Robert L. Peurifoy codified the discipline in Construction Planning, Equipment, and Methods, first published in 1956, which set out the cycle-time approach still used today: break the operation into load, haul, dump and return elements, estimate each, and derive hourly production from the total. Equipment manufacturers followed with their own reference data, most notably the Caterpillar Performance Handbook, which has been issued in successive editions since the early 1970s and publishes rimpull, rolling-resistance and travel-time curves that let estimators predict haul times for specific grades and road conditions. The refinement that separates fleet sizing from simple division came from mining. In 1968 W. C. Morgan and L. L. Peterson published a shovel-truck productivity method that introduced the match factor, the ratio of truck arrival rate to loader service rate, showing that a fleet matched above 1.0 gains little because the extra trucks queue at the loader. Queueing-theory and later discrete-event simulation studies through the 1970s and 1980s confirmed that random variation in haul times causes trucks to bunch, so real production falls short of deterministic estimates. Modern telematics on haul units now records actual cycle times directly, which is increasingly used to calibrate these estimates against measured site data rather than handbook averages.