Dock Door Calculator

Sizing a dock at exactly 100% theoretical capacity means any truck arriving even slightly early or a turn running slightly long causes a queue. The calculator targets 80% utilization instead, so peak-hour demand fills roughly four-fifths of the calculated doors' capacity, leaving headroom to absorb normal variability in arrival timing and turn times.

Cross-docking moves freight directly from inbound trailers to outbound trailers with little or no storage step in between, which means inbound and outbound trucks need separate staging doors operating in parallel rather than sharing the same doors sequentially -- this calculator adds 50% more doors on top of the base flow-through estimate to account for that added staging capacity.

A longer average turn time means each door can complete fewer truck turns per hour, which lowers the facility's effective per-door throughput -- to handle the same daily truck volume with slower turns, more doors are needed running in parallel to make up for the lost per-door capacity.

It's a simplified queueing estimate of how long an arriving truck might wait for a door to open up, based on how close the calculated door count runs to its theoretical peak capacity. A short wait time signals comfortable headroom; a wait time approaching or exceeding the average turn time signals the dock is running close to saturated and may benefit from an additional door.