How do you calculate the supplier shortage risk score?

Multiply severity by 0.40, likelihood by 0.35, and detection weakness by 0.25, then sum. Scores of 8, 6, and 5 give 3.2 plus 2.1 plus 1.25, or 6.55.

What is a high supplier shortage risk score?

On a 0-10 scale, scores above roughly 7 are high priority and 5 to 7 are moderate. The example's 6.55 is upper-moderate, flagging the part for buffer stock or a sourcing review.

Why is severity weighted highest?

Because a line-down shortage on EV final assembly carries the largest financial and schedule consequence, severity gets 0.40 so it dominates the score over likelihood at 0.35 and detection at 0.25.

How is this different from a standard FMEA RPN?

A classic RPN multiplies severity, occurrence, and detection, which over-weights extremes. This weighted-sum keeps the score on a stable 0-10 scale and lets you tune the relative importance of each factor.

What does detection/control weakness mean here?

It scores how poorly you would see a shortage coming, so a high number means weak supplier visibility, no early warning, and little control, increasing risk.

How should I use the score to act?

Sort parts by score and treat the top band first: add safety stock, qualify a second source, or tighten supplier monitoring. A 6.55 like the example warrants a concrete mitigation, not just watching.

EV & Battery Manufacturing calculator

EV Supplier Shortage Risk Score Calculator

EV and battery programs run on long-lead, single-source, and capacity-constrained parts, so a supply shortage can idle a final assembly line faster than almost any quality defect. This calculator condenses an FMEA-style assessment into one weighted risk score from severity, likelihood, and detection weakness, letting supply-chain and program teams rank parts by how badly and how probably a shortage would hurt. Severity carries the most weight because a line-down event dominates cost; likelihood and detection capability refine the picture. The result is a single comparable number you can use to triage buffer stock, dual-sourcing, and supplier audits across hundreds of part numbers.

What this calculator does

Score shortage risk for EV or battery suppliers using production impact, shortage likelihood, and detection weakness.
a procurement or operations team needs to rank supplier shortages before allocating expediters, buffers, or alternate sourcing
It blends a 0-10 severity, likelihood, and detection-weakness score into one weighted shortage-risk number using 0.40, 0.35, and 0.25 weights.

Formula used

Supplier shortage risk score = severity × 0.40 + likelihood × 0.35 + detection weakness × 0.25

Inputs explained

Production impact severity:
Shortage likelihood:
Detection/control weakness:

How to use the result

Use it to prioritize EV and battery parts for buffering, dual-sourcing, or supplier intervention during risk reviews.
Scores are judgment-based and only as good as the inputs; the model ranks relative risk and does not predict the probability or timing of an actual shortage.

Current U.S. benchmarks

The producer price index for copper and brass mill shapes stands at 559.593 (BLS, May 2026), up 76.8% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,484 per tonne (IMF via FRED, May 2026).
U.S. light vehicles sell at a 16.9 million annual rate (BEA, Jun 2026), up 4.1% from a year earlier, the volume signal for automotive supply chains.
Global copper trades at $13,484 per tonne (IMF via FRED, May 2026), up 41.5% in a year, and U.S. industrial electricity averages 8.66 cents per kWh. Both feed electrified-hardware unit economics.
The U.S. has 11,691 transportation equipment establishments employing about 1,682,910 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate the supplier shortage risk score? Multiply severity by 0.40, likelihood by 0.35, and detection weakness by 0.25, then sum. Scores of 8, 6, and 5 give 3.2 plus 2.1 plus 1.25, or 6.55.
What is a high supplier shortage risk score? On a 0-10 scale, scores above roughly 7 are high priority and 5 to 7 are moderate. The example's 6.55 is upper-moderate, flagging the part for buffer stock or a sourcing review.
Why is severity weighted highest? Because a line-down shortage on EV final assembly carries the largest financial and schedule consequence, severity gets 0.40 so it dominates the score over likelihood at 0.35 and detection at 0.25.
How is this different from a standard FMEA RPN? A classic RPN multiplies severity, occurrence, and detection, which over-weights extremes. This weighted-sum keeps the score on a stable 0-10 scale and lets you tune the relative importance of each factor.
What does detection/control weakness mean here? It scores how poorly you would see a shortage coming, so a high number means weak supplier visibility, no early warning, and little control, increasing risk.

Last reviewed 2026-05-12.