Aftermarket, Field Service & Service Parts worked example

Installed Base Coverage at 92% target installed-base coverage: a worked example

This scenario runs the installed base coverage calculation on the strong side: 92% target installed-base coverage, with every other input held at its documented default. an aftermarket sales or service operations manager needs to measure coverage of the active installed base

The inputs for this scenario

  • Covered installed units (under contract or warranty): 3,850 units (unchanged)
  • Active installed base in the field: 5,200 units (unchanged)
  • Target installed-base coverage: 92 % (raised for this scenario; the documented default is 80)

Working through the calculation

  • Applying the documented formula (Installed base coverage = covered installed units ÷ active installed base × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 74.04 % coverage for installed base coverage, the number this scenario is built around.
  • At this operating point the engine returns 17.96 percentage points for coverage gap to target.
  • At this operating point the engine returns 3,850 units for covered installed units.
  • At this operating point the engine returns 5,200 units for active installed base.

How this compares with the baseline

  • Against the tool's baseline example, where target installed-base coverage sits at 80% and the headline result is 74.04 % coverage, this scenario lands almost exactly on the baseline at 74.04 % coverage.
  • Use it in quarterly aftermarket reviews, before setting renewal-campaign goals, and when sizing the uncovered fleet your sales team should target. 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

  • Installed base coverage: 74.04 % coverage (headline result)
  • Coverage gap to target: 17.96 percentage points
  • Covered installed units: 3,850 units
  • Active installed base: 5,200 units

Run it with your numbers

  • Every input above is editable in the live Installed Base Coverage calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.