How do you calculate a factory performance score?

Multiply each factor by its weight and sum: severity times 0.40, occurrence times 0.35, detection times 0.25. With 8, 6, and 7 you get 3.2 plus 2.1 plus 1.75, which is 7.05.

Why is severity weighted highest?

Because a high-severity loss hurts output or safety most regardless of frequency. The 0.40 weight ensures damaging issues rise to the top even if they are relatively rare.

What is a good factory performance score?

Lower is better since it is a risk index. On a 1-to-10 scale, scores above roughly 7 warrant priority action; a 7.05 like this example is firmly in the act-now range.

How is this different from a standard FMEA RPN?

Classic RPN multiplies severity, occurrence, and detection equally. This score uses a weighted sum that emphasizes severity, avoiding the RPN problem where a single low factor masks real risk.

How should I rate detection?

Score detection by how likely the issue is to be caught before it hurts output, with higher numbers meaning harder to detect. A 7 means it often slips past current monitoring.

Can I change the weights?

The weights here are fixed at 40/35/25. If your plant values frequency over severity, document a different scheme, but keep it consistent so scores stay comparable.

OEE & Factory Performance calculator

Factory Performance Score Calculator

Factory Performance Score is a weighted risk index that ranks performance problems on a line by how bad they are, how often they happen, and how hard they are to catch. It borrows FMEA logic but tunes the weights for factory performance, leaning hardest on severity. Operations and reliability teams use it to prioritize which losses to attack first when everything looks like a fire. A high score points to issues that are damaging, frequent, and slip through undetected, the worst combination on any shop floor.

What this calculator does

Score factory performance from availability, throughput, and quality factors.
Use it when factory performance in oee and factory performance needs a defensible ranking against other oee and factory performance risks for the next review.
It computes a single weighted risk score from severity (40%), occurrence (35%), and detection (25%) ratings on a common scale.

Formula used

Weighted score = severity × 0.40 + occurrence × 0.35 + detection × 0.25

Inputs explained

Severity of performance loss:
Frequency of occurrence:
Detectability of the issue:

How to use the result

Use it to triage and rank performance or reliability issues across a line or plant when you cannot fix everything at once.
The score is only as good as the rating discipline behind it; inconsistent scoring between people makes cross-issue comparison unreliable, so anchor each scale with examples.

Current U.S. benchmarks

U.S. manufacturing runs at 75.6% of capacity (Federal Reserve, May 2026). New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate a factory performance score? Multiply each factor by its weight and sum: severity times 0.40, occurrence times 0.35, detection times 0.25. With 8, 6, and 7 you get 3.2 plus 2.1 plus 1.75, which is 7.05.
Why is severity weighted highest? Because a high-severity loss hurts output or safety most regardless of frequency. The 0.40 weight ensures damaging issues rise to the top even if they are relatively rare.
What is a good factory performance score? Lower is better since it is a risk index. On a 1-to-10 scale, scores above roughly 7 warrant priority action; a 7.05 like this example is firmly in the act-now range.
How is this different from a standard FMEA RPN? Classic RPN multiplies severity, occurrence, and detection equally. This score uses a weighted sum that emphasizes severity, avoiding the RPN problem where a single low factor masks real risk.
How should I rate detection? Score detection by how likely the issue is to be caught before it hurts output, with higher numbers meaning harder to detect. A 7 means it often slips past current monitoring.

Last reviewed 2026-05-12.