How do you calculate a Circular Design Readiness score?

Multiply the three factors: design-for-circularity gap severity x likelihood it affects recovery x weakness of design review controls. With 8, 4 and 5 the score is 5.85 on a normalized scale (8 x 4 x 5 = 160 raw, rescaled), which flags a high-priority gap to address before design freeze.

What is a good Circular Design Readiness score?

Lower is better — there is no universal threshold, but most teams set an action line (for example, anything in the top quartile of scores) and treat it as mandatory rework. A 5.85 on a roughly 1-10 normalized scale is high and should not pass a circularity gate without a mitigation plan.

How is this different from a standard FMEA RPN?

The math is identical (severity x occurrence x detection), but the lens is circularity: severity is about lost recovery value, occurrence is the chance the gap actually blocks reuse or recycling, and detection is whether your design review would catch it. It is an FMEA pointed at end-of-life, not at in-service failure.

Why use multiplication instead of adding the scores?

Multiplication makes the score blow up when any one factor is high, so a severe-but-rarely-triggered gap and a mild-but-certain gap separate cleanly. Adding would flatten those differences and let a single critical factor hide inside a middling total.

Should I rescore after a design change?

Yes. The main use is before-and-after: lower the detection-weakness score once you add a circularity checklist to design review, or lower severity once you switch to a mono-material housing, then recompute to confirm the gap dropped below your action line.

Can two reviewers compare scores directly?

Only if they use the same scoring scale and anchors for all three factors. The formula explicitly assumes a shared scale across comparable circular recovery and design risks; mixing a 1-5 and a 1-10 scale makes the scores meaningless to compare.

Circular Economy, Recycling & Remanufacturing calculator

Circular Design Readiness Calculator

Circular Design Readiness is an FMEA-style risk priority number for product design decisions that affect whether a part can be reused, repaired, recycled or remanufactured at end of life. It multiplies how bad a design-for-circularity gap is, how likely that gap is to actually block recovery, and how weak your current design review controls are at catching it. Design engineers, sustainability leads and DfX (Design for Excellence) teams use it to triage which design choices — bonded joints, mixed polymers, painted-over markings — to fix first instead of treating every circularity concern as equally urgent. Because it stacks three independent scores, a single high factor can dominate, which is exactly how you want a risk screen to behave.

What this calculator does

Score design readiness risk for disassembly, repairability, recycled content, material marking, and end-of-life recovery.
a team needs to prioritize design changes that improve reuse, repair, remanufacturing, or recycling for a design review
It computes a single Circular Design Readiness risk score by multiplying a design-for-circularity gap severity, the likelihood that gap blocks material or component recovery, and the weakness of your design review controls.

Formula used

Circular Design Readiness score = design-for-circularity gap severity score × likelihood the gap affects recovery score × weakness of current design review controls score
Use the same scoring scale across comparable circular recovery and design risks.

Inputs explained

Design-for-circularity gap severity score:
Likelihood the gap affects recovery score:
Weakness of current design review controls score:

How to use the result

Use it during design reviews, gate stage-gates, or supplier component approvals to rank which circularity gaps to remediate before a design is frozen.
The score is only as consistent as your scoring scale — it ranks relative risk, it does not predict an absolute recovery rate or cost, and unscaled scores from different reviewers are not comparable.

Common questions

How do you calculate a Circular Design Readiness score? Multiply the three factors: design-for-circularity gap severity x likelihood it affects recovery x weakness of design review controls. With 8, 4 and 5 the score is 5.85 on a normalized scale (8 x 4 x 5 = 160 raw, rescaled), which flags a high-priority gap to address before design freeze.
What is a good Circular Design Readiness score? Lower is better — there is no universal threshold, but most teams set an action line (for example, anything in the top quartile of scores) and treat it as mandatory rework. A 5.85 on a roughly 1-10 normalized scale is high and should not pass a circularity gate without a mitigation plan.
How is this different from a standard FMEA RPN? The math is identical (severity x occurrence x detection), but the lens is circularity: severity is about lost recovery value, occurrence is the chance the gap actually blocks reuse or recycling, and detection is whether your design review would catch it. It is an FMEA pointed at end-of-life, not at in-service failure.
Why use multiplication instead of adding the scores? Multiplication makes the score blow up when any one factor is high, so a severe-but-rarely-triggered gap and a mild-but-certain gap separate cleanly. Adding would flatten those differences and let a single critical factor hide inside a middling total.
Should I rescore after a design change? Yes. The main use is before-and-after: lower the detection-weakness score once you add a circularity checklist to design review, or lower severity once you switch to a mono-material housing, then recompute to confirm the gap dropped below your action line.

Last reviewed 2026-05-12.