CMMS, EAM & Spare Parts Management worked example

Emergency Work Ratio with emergency or break-in work orders of 110 work orders: a worked example

Push emergency or break-in work orders up to 110 work orders and the picture changes. This example computes every intermediate figure at that operating point. a maintenance or asset-management team needs to track reactive work, justify planning improvements, and target failure modes driving urgent work for a work order mix

The inputs for this scenario

  • Emergency or break-in work orders: 110 work orders (raised for this scenario; the documented default is 42)
  • Total maintenance work orders: 310 work orders (unchanged)
  • Percentage conversion multiplier: 100 x (unchanged)

Working through the calculation

  • Applying the documented formula (Emergency Work Ratio = emergency or break-in work orders รท total maintenance work orders) to the inputs above produces each figure below.
  • At this operating point the engine returns 35.48 % for emergency work ratio, the number this scenario is built around.
  • At this operating point the engine returns 0.35 value for raw ratio.
  • At this operating point the engine returns 100 x for conversion factor.
  • At this operating point the engine returns 310 value for total maintenance work orders.

How this compares with the baseline

  • Against the tool's baseline example, where emergency or break-in work orders sits at 42 work orders and the headline result is 13.55 %, this scenario comes in 162% above the baseline at 35.48 %.
  • It divides emergency or break-in work orders by total maintenance work orders and multiplies by 100 to express reactive work as a percentage. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Emergency Work Ratio: 35.48 % (headline result)
  • Raw ratio: 0.35 value
  • Conversion factor: 100 x
  • total maintenance work orders: 310 value

Run it with your numbers

  • Every input above is editable in the live Emergency Work Ratio calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.