Maintenance & Reliability worked example

Planned Downtime Percentage at 5.76% planned downtime target: a worked example

This worked example runs the planned downtime percentage numbers for a tougher week than the baseline: 5.76% planned downtime target instead of the typical 8%. Measure the share of available time consumed by scheduled maintenance, inspections, and other planned stops.

The inputs for this scenario

  • Planned maintenance hours: 48 hr (held at the documented default)
  • Total available hours: 720 hr (held at the documented default)
  • Planned downtime target: 5.76 % (the input this scenario stresses; the baseline uses 8)

Working through the calculation

  • The calculation starts from the formula this tool documents: Planned downtime percentage = planned maintenance hours ÷ total available hours × 100.
  • Planned Downtime Share works out to 6.67 % at these inputs, and this is the headline figure for the scenario.
  • Gap to Planned Downtime Target works out to -0.91 points at these inputs.
  • Planned Maintenance Hours works out to 48 count at these inputs.
  • Available Hours works out to 720 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where planned downtime target sits at 8% and the headline result is 6.67 %, this scenario lands almost exactly on the baseline at 6.67 %.
  • Use it during monthly maintenance planning reviews or when allocating PM windows against a production schedule. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Planned Downtime Share: 6.67 % (headline result)
  • Gap to Planned Downtime Target: -0.91 points
  • Planned Maintenance Hours: 48 count
  • Available Hours: 720 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Planned Downtime Percentage calculator, set planned downtime target to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.