How do you calculate a manufacturability score?

Multiply the severity, occurrence, and detection ratings on a common scale. With severity 6, occurrence 4, and detection 3 the worked example resolves to a risk score of about 4.55 on the calculator's normalized scale.

What is a good manufacturability score?

Lower is better. There's no universal cutoff, but features in the top quartile of your scored list deserve redesign regardless of absolute number, and any feature with a high severity rating warrants attention even at low occurrence.

What's the difference between severity, occurrence, and detection here?

Severity is how damaging the manufacturing failure is, occurrence is how likely it is given the current design, and detection is how hard the problem is to catch before it reaches the customer. Detection scores invert: harder to catch means a higher, worse number.

Manufacturability score vs design FMEA RPN?

It is the same multiplicative logic, scoped specifically to producibility rather than field failure. Use it inside DFM reviews where the failure modes are scrap, rework, and assembly difficulty rather than warranty returns.

Should I act on the highest score automatically?

Use it to rank, not to auto-decide. Always open the underlying ratings, because a high-severity, low-occurrence feature can be more urgent than a higher composite driven only by detection difficulty.

How many features should I score?

Score every feature flagged in DFM review on the same scale. Consistency across the set is what makes the ranking trustworthy.

NPI, DFM/DFA & Engineering Change calculator

Manufacturability Score Calculator

The Manufacturability Score is an FMEA-style risk priority number applied to a design's producibility, multiplying how bad a manufacturing problem is, how often it happens, and how hard it is to catch before it ships. DFM engineers and NPI teams use it to rank which features, tolerances, or process steps to redesign first when a print can't be fixed all at once. It matters because intuition about 'what's hard to make' is unreliable, while a consistent severity-occurrence-detection scale forces apples-to-apples comparison across dozens of features. A high score points straight at the geometry or callout most likely to drive scrap, rework, or line stoppages.

What this calculator does

Estimate manufacturability for npi, dfm/dfa and engineering change using production-ready inputs so teams can rank risks and decide which issue needs containment, controls, or escalation first.
Use it when manufacturability in npi, dfm/dfa and engineering change needs a defensible ranking against other npi, dfm/dfa and engineering change risks for the next review.
It computes a single manufacturability risk number by multiplying severity, occurrence, and detection ratings for a design feature or process risk.

Formula used

Manufacturability risk score = manufacturability severity score × manufacturability occurrence score × manufacturability detection score
Use the same scoring scale across comparable manufacturability risks.

Inputs explained

Manufacturability defect severity rating:
Manufacturability defect occurrence likelihood:
Manufacturability defect detection difficulty:

How to use the result

Use it during DFM reviews to triage which manufacturability concerns get engineering attention before tooling is cut.
Multiplicative RPNs hide their inputs; a 6x4x3 and a 9x2x4 land near the same value despite very different real-world urgency, so always inspect the component scores.

Common questions

How do you calculate a manufacturability score? Multiply the severity, occurrence, and detection ratings on a common scale. With severity 6, occurrence 4, and detection 3 the worked example resolves to a risk score of about 4.55 on the calculator's normalized scale.
What is a good manufacturability score? Lower is better. There's no universal cutoff, but features in the top quartile of your scored list deserve redesign regardless of absolute number, and any feature with a high severity rating warrants attention even at low occurrence.
What's the difference between severity, occurrence, and detection here? Severity is how damaging the manufacturing failure is, occurrence is how likely it is given the current design, and detection is how hard the problem is to catch before it reaches the customer. Detection scores invert: harder to catch means a higher, worse number.
Manufacturability score vs design FMEA RPN? It is the same multiplicative logic, scoped specifically to producibility rather than field failure. Use it inside DFM reviews where the failure modes are scrap, rework, and assembly difficulty rather than warranty returns.
Should I act on the highest score automatically? Use it to rank, not to auto-decide. Always open the underlying ratings, because a high-severity, low-occurrence feature can be more urgent than a higher composite driven only by detection difficulty.

Last reviewed 2026-05-12.