Meat, Poultry & Seafood Processing worked example

Shelf-Life Risk with severity of shelf life failure of 3.5 1-10: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop severity of shelf life failure to 3.5 1-10, then walk the calculation through step by step. Calculate a shelf life risk priority number (RPN) for a meat, poultry, or seafood product using severity, occurrence, and detection scores to prioritize food safety controls.

The inputs for this scenario

  • Severity of shelf life failure: 3.5 1-10 (the input this scenario stresses; the baseline uses 7)
  • Occurrence likelihood: 4 1-10 (held at the documented default)
  • Detection capability: 5 1-10 (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Shelf life risk priority number (RPN) = severity x occurrence x detection.
  • Shelf life risk priority number (RPN) works out to 4.05 score at these inputs, and this is the headline figure for the scenario.
  • Severity of shelf life failure works out to 3.5 score at these inputs.
  • Occurrence likelihood works out to 4 score at these inputs.
  • Detection capability score works out to 5 score at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where severity of shelf life failure sits at 7 1-10 and the headline result is 5.45 score, this scenario comes in 25.69% below the baseline at 4.05 score.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to severity of shelf life failure, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. RPN is ordinal, not a probability; equal scores can represent very different real risks, so a high severity should be weighted heavily even when the product of the three numbers looks moderate.

Results at a glance

  • Shelf life risk priority number (RPN): 4.05 score (headline result)
  • Severity of shelf life failure: 3.5 score
  • Occurrence likelihood: 4 score
  • Detection capability score: 5 score

Run it with your numbers

  • To rerun this with your own numbers, open the live Shelf-Life Risk calculator, set severity of shelf life failure to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.