How do you calculate an Asset Criticality Score?

Multiply three scores: consequence severity x failure likelihood x detection weakness. With 9, 4 and 5 the score is 6.25 on the calculator's normalized scale, reflecting a high-consequence asset that fails moderately often and is moderately hard to catch early.

What is a good Asset Criticality Score?

Lower is safer. There is no universal cutoff, but most teams bucket their fleet into thirds and reserve intensive PM, condition monitoring and full spares for the top tier. The key is consistency: a 6.25 only means something relative to the other assets scored on the same scale.

Is Asset Criticality the same as an FMEA RPN?

It uses the same severity x occurrence x detection logic as an FMEA Risk Priority Number, but it is applied at the asset level rather than the failure-mode level, so it ranks whole machines for PM and stocking decisions instead of individual defects.

Why multiply the scores instead of adding them?

Multiplying makes the metric react sharply when any one factor is severe. An asset that is catastrophic to lose, frequent to fail, and invisible until it breaks should score far higher than three middling factors, and addition would flatten that distinction.

How should I set the detectability score?

Higher means harder to detect. A bearing with continuous vibration monitoring scores low because failure is caught early; a hidden internal seal with no warning signs scores high. In the example a 5 reflects partial warning - some symptoms exist but they are easy to miss.

How often should criticality be re-scored?

Re-score after any major failure, a redesign, a change in production demand, or at least annually. Likelihood and detectability drift as assets age and as you add or remove monitoring, so a score frozen from commissioning quickly stops reflecting reality.

CMMS, EAM & Spare Parts Management calculator

Asset Criticality Score Calculator

Asset Criticality Score is an FMEA-style risk number that ranks equipment by multiplying the consequence of failure, how often it tends to fail, and how hard the failure is to catch in time. Reliability engineers, maintenance planners and CMMS administrators use it to decide which assets earn a preventive maintenance plan, which spares to stock, and which lines deserve condition monitoring. It turns a vague gut feeling of 'this machine matters' into a defensible number you can sort and budget against. On a real shop floor it is the difference between PM hours scattered evenly and PM hours aimed at the assets that will actually hurt you.

What this calculator does

Score asset criticality using consequence, failure likelihood, and detectability so maintenance and spares priorities align with risk.
a maintenance or asset-management team needs to rank equipment for PM strategy, critical spares, condition monitoring, and replacement planning for a asset criticality review
It multiplies a consequence severity score, a failure likelihood score and a detectability weakness score into a single criticality (RPN-style) number for one asset.

Formula used

Asset Criticality Score risk score = asset consequence severity score × asset failure likelihood score × failure detectability weakness score
Use the same scoring scale across comparable assets, work orders, parts families, and maintenance risk reviews.

Inputs explained

Consequence severity if this asset fails:
Likelihood of failure within the review window:
Difficulty of detecting the failure before it happens:

How to use the result

Use it when building or re-ranking a PM program, setting spare-parts stocking levels, or running a maintenance risk review across a fleet of comparable assets.
Scores are subjective and multiplicative, so a single inflated 9 or 10 can dominate the result; calibrate the scale with the team and treat the number as a ranking aid, not an absolute risk in dollars.

Common questions

How do you calculate an Asset Criticality Score? Multiply three scores: consequence severity x failure likelihood x detection weakness. With 9, 4 and 5 the score is 6.25 on the calculator's normalized scale, reflecting a high-consequence asset that fails moderately often and is moderately hard to catch early.
What is a good Asset Criticality Score? Lower is safer. There is no universal cutoff, but most teams bucket their fleet into thirds and reserve intensive PM, condition monitoring and full spares for the top tier. The key is consistency: a 6.25 only means something relative to the other assets scored on the same scale.
Is Asset Criticality the same as an FMEA RPN? It uses the same severity x occurrence x detection logic as an FMEA Risk Priority Number, but it is applied at the asset level rather than the failure-mode level, so it ranks whole machines for PM and stocking decisions instead of individual defects.
Why multiply the scores instead of adding them? Multiplying makes the metric react sharply when any one factor is severe. An asset that is catastrophic to lose, frequent to fail, and invisible until it breaks should score far higher than three middling factors, and addition would flatten that distinction.
How should I set the detectability score? Higher means harder to detect. A bearing with continuous vibration monitoring scores low because failure is caught early; a hidden internal seal with no warning signs scores high. In the example a 5 reflects partial warning - some symptoms exist but they are easy to miss.

Last reviewed 2026-05-12.