Work out delivery density cost instantly with clear inputs, formula shown and shareable results.
Delivery cost per drop falls with the square root of delivery density, a well-established result in vehicle routing. Doubling density therefore cuts distance per drop by about 29%, which is why building volume in existing postcodes beats expanding the service area.
Distance per drop
Km per drop = 0.75 / sqrt(Deliveries per square km)
Cost per drop
Cost per drop = Km per drop x Cost per route km
Because in a uniformly served area the average distance between neighbouring stops scales with the inverse square root of density. It is the standard continuous-approximation routing result.
Deepen coverage before widening it. Adding customers in served areas is far cheaper per drop than opening new territory.