How do you calculate a supplier ramp readiness risk score?

Multiply the severity, occurrence, and detection scores together. On the built-in scale, severity 6, occurrence 4, and detection 3 combine into a risk score of about 4.55 for ranking against other suppliers.

What is severity, occurrence, and detection here?

Severity is how badly a supplier miss hurts your ramp, occurrence is how likely the miss is, and detection is how hard the miss is to catch before it reaches your line. Higher detection scores mean harder to catch.

What is a good supplier ramp readiness score?

Lower is better. There is no universal threshold; rank suppliers by score and set an action line above which mitigation is mandatory, based on your program's risk appetite.

Why multiply instead of add the three scores?

Multiplying makes a high score on any one axis dominate, which mirrors reality: a catastrophic, undetectable failure should outrank three merely moderate concerns even if the sums look similar.

Supplier ramp readiness vs a standard FMEA RPN, what is the difference?

The math is the same multiplicative logic. This version frames the axes specifically around a supplier's ability to scale with your ramp rather than around a product or process failure mode.

How often should I rescore suppliers during a ramp?

At each ramp step and whenever new data lands, such as a missed sample date or a capacity audit. Occurrence and detection scores move as you learn, so the ranking should be refreshed.

Production Ramp, Scale-Up & Launch Readiness calculator

Supplier Ramp Readiness Calculator

Supplier ramp readiness scores the risk that a given supplier will fail to keep pace as your production ramp steps up volume, using the FMEA logic of severity, occurrence, and detection. Supply chain and NPI teams use it to rank suppliers so mitigation effort lands on the ones most likely to stall the line. A supplier that cannot scale, or whose slip you would not catch until parts starve the floor, is a launch risk hiding in plain sight. Multiplying the three scores into a single risk number makes those hidden risks comparable and sortable across the whole supplier list.

What this calculator does

Estimate supplier ramp readiness for production ramp, scale-up and launch readiness using production-ready inputs so teams can rank risks and decide which issue needs containment, controls, or escalation first.
Use it when supplier ramp readiness in production ramp, scale-up and launch readiness needs a defensible ranking against other production ramp, scale-up and launch readiness risks for the next review.
It multiplies severity, occurrence, and detection scores into a single supplier ramp risk number in the manner of an FMEA RPN.

Formula used

Supplier ramp readiness risk score = supplier ramp readiness severity score × supplier ramp readiness occurrence score × supplier ramp readiness detection score
Use the same scoring scale across comparable supplier ramp readiness risks.

Inputs explained

Impact severity if supplier misses ramp:
Likelihood the supplier misses ramp:
Detectability before it hits your line:

How to use the result

Use it during ramp planning to rank suppliers and focus mitigation on the highest-risk ones first.
The score is only as good as the scoring scale; use one consistent scale across suppliers or the numbers are not comparable.

Common questions

How do you calculate a supplier ramp readiness risk score? Multiply the severity, occurrence, and detection scores together. On the built-in scale, severity 6, occurrence 4, and detection 3 combine into a risk score of about 4.55 for ranking against other suppliers.
What is severity, occurrence, and detection here? Severity is how badly a supplier miss hurts your ramp, occurrence is how likely the miss is, and detection is how hard the miss is to catch before it reaches your line. Higher detection scores mean harder to catch.
What is a good supplier ramp readiness score? Lower is better. There is no universal threshold; rank suppliers by score and set an action line above which mitigation is mandatory, based on your program's risk appetite.
Why multiply instead of add the three scores? Multiplying makes a high score on any one axis dominate, which mirrors reality: a catastrophic, undetectable failure should outrank three merely moderate concerns even if the sums look similar.
Supplier ramp readiness vs a standard FMEA RPN, what is the difference? The math is the same multiplicative logic. This version frames the axes specifically around a supplier's ability to scale with your ramp rather than around a product or process failure mode.

Last reviewed 2026-05-12.