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sci.failure-mode-effects-RPN Calculator
Calculates the Risk Priority Number (RPN = Severity × Occurrence × Detection) for FMEA risk ranking of failure modes. RPN > 100 generally requires corrective action — high-severity failures (S = 9–10) should be addressed regardless of RPN due to catastrophic consequences.
Inputs
Severity S
Reference formula or conversion factor shown for context.
Occurrence O
Reference formula or conversion factor shown for context.
Detection D
Reference formula or conversion factor shown for context.
Results
Risk Priority Number RPN
Overall risk level based on the computed score or classification. Higher risk may call for mitigating actions or additional review.
priority class
The classification assigned based on the computed value.
severity S
Reference formula or conversion factor shown for context.
occurrence O
Sample size or count used in the calculation.
detection D
Sample size or count used in the calculation.
FMEA — Ford/NASA (1960s) | RPN = S×O×D | focus on highest RPN AND high-severity items regardless of RPN | SAE J1739