Stone, Countertops & Engineered Surfaces worked example

Install Kit Cost at 99% kit utilization rate: a worked example

This scenario runs the install kit cost calculation on the strong side: 99% kit utilization rate, with every other input held at its documented default. An install coordinator budgeting consumable kits for a run of residential countertop jobs.

The inputs for this scenario

  • Countertop installs completed: 80 jobs (unchanged)
  • Kit cost per install: 35 $/job (unchanged)
  • Kit utilization rate: 99 % (raised for this scenario; the documented default is 95)
  • Restock minimum charge: 250 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Install kit cost $ = installs x kit cost per job x utilization% + restock minimum) to the inputs above produces each figure below.
  • At this operating point the engine returns 3,022 $ for total install kit cost, the number this scenario is built around.
  • At this operating point the engine returns 37.78 $ / piece for install kit cost per unit.
  • At this operating point the engine returns 2,772 $ for variable install kit cost.
  • At this operating point the engine returns 250 $ for fixed install kit cost adder.

How this compares with the baseline

  • Against the tool's baseline example, where kit utilization rate sits at 95% and the headline result is 2,910 $, this scenario comes in 3.85% above the baseline at 3,022 $.
  • Use it when pricing a batch of installs, reconciling monthly install-consumable spend against jobs completed, or comparing kit suppliers. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Total install kit cost: 3,022 $ (headline result)
  • Install kit cost per unit: 37.78 $ / piece
  • Variable install kit cost: 2,772 $
  • Fixed install kit cost adder: 250 $

Run it with your numbers

  • Every input above is editable in the live Install Kit Cost calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.