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Calcimator

FMEA Risk Priority Number Calculator

Calculate the Risk Priority Number (RPN) from Severity, Occurrence, and Detection ratings. Assess failure mode risk level and recommended priority actions.

Inputs

Results

Risk Priority Number (RPN)

168

Risk Level

Medium-High Risk

Recommended Action

Action plan needed

Criticality (S × O)28
RPN % of Maximum16.8%
Severity AssessmentHigh — major customer dissatisfaction
Detection AssessmentModerate chance of detection
How to Use This Calculator
  1. Enter Severity (1-10), Occurrence (1-10), and Detection (1-10).
  2. Review Risk Priority Number (RPN), Risk Level, and Recommended Action.
  3. Use Criticality (S × O) and RPN % of Maximum to inform your decision.
  4. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Detection (1-10)

Detection (1-10)Risk Priority Number (RPN)Risk LevelRecommended Action
1.956Low-Medium RiskMonitor during regular reviews
4.15112Medium RiskMonitor and plan improvements
6.85196Medium-High RiskAction plan needed
9.1252High RiskImmediate action required

What each input means

Severity (1-10)
Impact of the failure on the customer. 1 = no effect, 10 = hazardous/safety issue without warning.
Occurrence (1-10)
Likelihood of the cause occurring. 1 = extremely unlikely, 10 = almost certain.
Detection (1-10)
Ability to detect the failure before it reaches the customer. 1 = almost certain detection, 10 = virtually undetectable.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Severity (1-10) = 7, Occurrence (1-10) = 4, Detection (1-10) = 6 = 3 input(s) provided
  2. Calculate Risk Priority Number
    Risk Priority Number
    168 = 168
  3. Calculate Risk Level
    Medium-High Risk = Medium-High Risk
  4. Calculate Recommended Action
    Action plan needed = Action plan needed
  5. Calculate Criticality
    Criticality
    28 = 28
  6. Calculate RPN % of Maximum
    RPN % of Maximum
    16.8 = 16.8

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