CMMS, EAM & Spare Parts Management worked example

Emergency Work Ratio with emergency or break-in work orders of 21 work orders: a worked example

Suppose emergency or break-in work orders falls to 21 work orders. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate the ratio of emergency work orders to total work orders so maintenance leaders can see how reactive the work mix is.

The inputs for this scenario

  • Emergency or break-in work orders: 21 work orders (the input this scenario stresses; the baseline uses 42)
  • Total maintenance work orders: 310 work orders (held at the documented default)
  • Percentage conversion multiplier: 100 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Emergency Work Ratio = emergency or break-in work orders รท total maintenance work orders.
  • Emergency Work Ratio works out to 6.77 % at these inputs, and this is the headline figure for the scenario.
  • Raw ratio works out to 0.07 value at these inputs.
  • Conversion factor works out to 100 x at these inputs.
  • total maintenance work orders works out to 310 value at these inputs.

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 50% below the baseline at 6.77 %.
  • It divides emergency or break-in work orders by total maintenance work orders and multiplies by 100 to express reactive work as a percentage. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Emergency Work Ratio: 6.77 % (headline result)
  • Raw ratio: 0.07 value
  • Conversion factor: 100 x
  • total maintenance work orders: 310 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Emergency Work Ratio calculator, set emergency or break-in work orders to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.