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Delivery Window Utilization Calculator

The Delivery Window Utilization Calculator shows how much of an available delivery window is occupied by scheduled stops and the service time required at those stops. It helps dispatchers see whether a route plan leaves enough time for travel variability, parking, handoffs, and other unplanned friction before the window closes.

The main result is a utilization percentage, supported by used hours and remaining hours. A value below 100% means some window capacity is still unallocated; 100% means the entered schedule fully consumes the window; and a value above 100% indicates that the planned work does not fit without changing the schedule, duration assumptions, or window.

Window capacity inputs

stops
min
hours
hours
Result
—
Delivery window utilization
Planned hours used—
Unallocated window—
Schedule fit—

1. Count scheduled stops
Enter the number of delivery or pickup stops that must be completed inside the window.

2. Set service time
Use the average minutes spent servicing one stop, excluding travel between stops.

3. Add planned travel
Enter the total travel hours expected within the same delivery window.

4. Enter window length
Specify the total hours available for the route or delivery block.

5. Check utilization
Use the percentage and remaining-hours result to see whether the schedule fits and how much buffer remains.

Service hours = Scheduled stops × Service time per stop ÷ 60
Planned hours used = Service hours + Planned travel time
Window utilization (%) = Planned hours used ÷ Available delivery window × 100
Unallocated window = Available delivery window − Planned hours used

Where:

  • Scheduled stops = count of stops
  • Service time per stop = average minutes per stop
  • Planned travel time = total travel hours inside the window
  • Available delivery window = total hours available

Assumptions: The calculation treats average service time as constant across stops and assumes travel time is already aggregated for the full route.

What the result means

Use the primary result together with the supporting values to evaluate the specific supply-chain scenario represented by your inputs.

This calculator is a planning estimate. Operational definitions, data quality, and local business rules can change how the result should be applied.

Given:

  • Scheduled stops = 9
  • Service time per stop = 25 minutes
  • Planned travel time = 4.25 hours
  • Available delivery window = 9 hours

Calculation:
Service hours = 9 × 25 ÷ 60 = 3.75 hours
Planned hours used = 3.75 + 4.25 = 8.00 hours
Utilization = 8 ÷ 9 × 100 = 88.89%
Unallocated window = 9 − 8 = 1 hour

Result: 88.9% delivery-window utilization.

Interpretation: The plan leaves one hour unallocated, which can act as buffer for ordinary route variability or additional work.

Is higher delivery-window utilization always better?

Not necessarily. Very high utilization may look efficient but can leave little room for delays, variable service times, or recovery after a late stop.

Should breaks be included in planned travel time?

Include any paid or operational time that consumes the delivery window. If breaks are tracked separately, add them to travel time rather than omitting them.

What happens if utilization is above 100%?

The entered work requires more time than the available window. Reduce stops, shorten service time, improve the route, or extend the window before treating the plan as feasible.

Can service time vary by stop?

Yes, but this calculator uses one average service time. For a mixed route, use a weighted average or calculate high- and low-service stop groups separately.

How is utilization different from service level?

Utilization measures how much time capacity is consumed. Service level measures how consistently delivery commitments are achieved across orders or stops.