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FMEA RPN and Action Priority Tool

Score failure modes with Severity, Occurrence, and Detection values, calculate RPN and Action Priority, and test before-and-after mitigation scenarios inside a sortable FMEA table.

Tool

Enter failure modes and ratings

Core formula: RPN = Severity x Occurrence x Detection

Priority method

Use one row per failure mode in the format: `Failure mode, Effect, S, O, D, New S, New O, New D`

Thresholds

Recommended action logic

Rows with AP = High or RPN above the working threshold should move to immediate action planning.

Mode summary: Classic mode uses a pragmatic RPN threshold overlay, while AIAG/VDA mode maps the combination to an action priority band.

After-mitigation view: use the recalculated RPN and AP to judge whether additional controls are still required.

Simulator

Before / after effect

Failure Mode Before RPN After RPN Delta
Seal leak 216 72 144

Module

Sortable FMEA table

Recommended Action New RPN New AP
Seal leak Customer complaint 9 4 6 216 High Immediate action plan 72 Medium

Instructions

How to use this app

  1. Choose classic S/O/D scoring or AIAG/VDA-style Action Priority mode.
  2. Enter one failure mode per row with current S, O, D and proposed post-mitigation values.
  3. Click `Calculate FMEA` to return RPN, AP, threshold guidance, and before/after deltas.
  4. Use the sortable table to rank the full module by RPN, AP, severity, or any other field.
  5. Review the after-mitigation column to decide whether the proposed action is sufficient or whether more controls are needed.

Classic RPN is still useful for prioritization, but Action Priority gives more weight to high-severity scenarios even when the numeric RPN is not extreme.

The built-in AP logic here is a practical approximation for day-to-day FMEA work. If your customer or plant uses a stricter AIAG/VDA interpretation, align the rules to that local standard.