A AshToolbox / Maintenance & Reliability Suite
Intermediate Category: Availability & Performance • ~5 min read

MTBF & MTTR from Raw Failure Logs

Derive verified reliability metrics directly from maintenance history CSV exports.

Q:

How do you compute verified MTBF and MTTR directly from CMMS maintenance logs?

Filter out non-breakdown tasks, sum total operational uptime, and divide by the count of corrective failure work orders: MTBF = Total Operating Time / Corrective Failures, and MTTR = Total Corrective Repair Duration / Corrective Failures.

100% In-Browser Execution — Zero Server Storage.

Work Order History (CSV)

Format: WO ID, Asset Name, Operating Hours, Down Hours, Type

Empirical MTBF
805.0 h
From 4 breakdowns
Empirical MTTR
4.0 h
Mean corrective downtime
Availability
99.41%
Uptime percentage
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CMMS Work Order Data Cleansing

Empirical reliability calculation requires isolating true functional failures from scheduled preventive maintenance. Accidental inclusion of planned overhauls artificially deflates MTBF, producing skewed risk assessments.

Engineering & Regulatory Notice: The calculations, projections, and failure models provided in this suite are for engineering estimation and educational purposes. Verify all calculations and assumptions independently before making operational, equipment replacement, safety-critical, or regulatory compliance decisions.

Recommended Next Steps in Reliability Workflow

Availability & Performance

Downtime Pareto & Loss Tree

Identify the 20% of failure modes generating 80% of lost production time.

 Availability & Performance

Equipment Availability Calculator

Benchmark uptime and quantify annual lost production hours against MTBF and MTTR.

 Work Management & KPIs

EN 15341 / SMRP Maintenance KPI Dashboard

Benchmark your maintenance operation against world-class industry standards with clear guidance ranges.