Safety & Workforce worked example

Machine Guarding Risk with injury severity rating of 4 score: a worked example

This worked example runs the machine guarding risk numbers for a tougher week than the baseline: injury severity rating of 4 score instead of the typical 8 score. Score machine guarding risk from severity, exposure, and detection factors.

The inputs for this scenario

  • Injury severity rating: 4 score (the input this scenario stresses; the baseline uses 8)
  • Exposure occurrence rating: 6 score (held at the documented default)
  • Hazard detectability rating: 7 score (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Weighted score = severity × 0.40 + occurrence × 0.35 + detection × 0.25.
  • Machine guarding risk score works out to 5.45 score at these inputs, and this is the headline figure for the scenario.
  • Machine guarding risk severity score works out to 4 score at these inputs.
  • Machine guarding risk occurrence score works out to 6 score at these inputs.
  • Machine guarding risk detection score works out to 7 score at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where injury severity rating sits at 8 score and the headline result is 7.05 score, this scenario comes in 22.7% below the baseline at 5.45 score.
  • Use it during a machine-guarding audit or ISO 12100-style risk assessment to rank multiple hazards on one machine, or to compare guarding priorities across a line of equipment. 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

  • Machine guarding risk score: 5.45 score (headline result)
  • Machine guarding risk severity score: 4 score
  • Machine guarding risk occurrence score: 6 score
  • Machine guarding risk detection score: 7 score

Run it with your numbers

  • To rerun this with your own numbers, open the live Machine Guarding Risk calculator, set injury severity rating to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.