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Free Maintenance and Reliability Engineering Tools

Professional reliability modeling, equipment availability analysis, maintenance strategy optimization, and root-cause risk tools. Built with double-precision mathematical rigor, provable golden tests, and zero server transmission.

32
Engineering Tools
8
Core Disciplines
100%
Private (IndexedDB)
0 ms
Blocking Time
Infant Mortality (β < 1) Useful Life (β ≈ 1) Wear-out (β > 1)
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Reliability Analysis 7

Weibull life data analysis, mission reliability, RBD, and failure modeling.

Advanced Batch 1

Weibull Life Data Analysis

2- and 3-parameter Weibull fit with right-censored data via Rank Regression & MLE, probability plotting, and MTTF.

Estimate failure characteristics, B10 life, and failure rate behavior (infant vs wear-out). Open Tool →
Foundational Batch 1

Reliability, MTBF & Demonstration Planner

Compute failure rate (lambda), MTBF, mission reliability R(t), chi-square confidence bounds, and zero-failure test sample size.

Determine statistical mission reliability and calculate required test duration or sample size. Open Tool →
Advanced Batch 2

Reliability Block Diagram (RBD)

Series, parallel, k-out-of-n, and standby redundancy configuration modeling with Birnbaum importance measures.

Calculate total system reliability and identify single points of failure. Open Tool →
Advanced Batch 2

Fault Tree Analysis (FTA)

Construct fault trees with AND, OR, and k-of-n gates, MOCUS minimal cut sets, and Fussell-Vesely importance metrics.

Identify critical minimal cut sets and compute system top-event failure probability. Open Tool →
Advanced Batch 3

Reliability Growth (Crow-AMSAA)

Track reliability improvements during testing using the Crow-AMSAA NHPP power law model and Duane plotting.

Track MTBF growth and project cumulative test hours required to reach target MTBF. Open Tool →
Intermediate Batch 3

Repairable Systems Trend (Laplace Test)

Statistical Laplace and MIL-HDBK-189 trend tests to determine if asset failure rate is improving, stable, or deteriorating.

Statistically verify whether wear-out is setting in or maintenance is improving reliability. Open Tool →
Intermediate Batch 3

Accelerated Life Test (ALT) Planner

Arrhenius, Inverse Power Law, and Eyring thermal/electrical stress acceleration factors and equivalent test durations.

Calculate acceleration factors (AF) and shorten life test durations under elevated stress. Open Tool →

Availability & Performance 4

Operational availability, OEE & TEEP loss waterfalls, and downtime analytics.

Foundational Batch 1

Equipment Availability Calculator

Calculate Inherent (Ai), Achieved (Aa), and Operational (Ao) availability, series/parallel uptime, and yearly downtime hours.

Benchmark uptime and quantify annual lost production hours against MTBF and MTTR. Open Tool →
Intermediate Batch 1

OEE & TEEP Performance Calculator

Overall Equipment Effectiveness (OEE) and Total Effective Equipment Performance (TEEP) with Six Big Losses waterfall.

Isolate availability, performance, and quality bottlenecks across operating shifts. Open Tool →
Intermediate Batch 1

Downtime Pareto & Loss Tree

Analyze failure logs via 80/20 Pareto distribution by cause, asset, or subsystem with cumulative duration & frequency markers.

Identify the 20% of failure modes generating 80% of lost production time. Open Tool →
Intermediate Batch 2

MTBF & MTTR from Raw Failure Logs

Upload work order CSV logs to calculate empirical MTBF, MTTR, MTTF, and censored operating time per asset.

Derive verified reliability metrics directly from maintenance history CSV exports. Open Tool →

Maintenance Planning & Strategy 6

PM interval optimization, criticality ranking, P-F planning, and RCM worksheets.

Advanced Batch 1

Preventive Maintenance Interval Optimizer

Age-replacement and block-replacement cost rate minimization balancing planned replacement vs unplanned failure costs.

Find the mathematically optimum PM interval that minimizes total maintenance cost per unit time. Open Tool →
Intermediate Batch 2

PM Schedule & Workload Balancer

Generate rolling multi-asset calendar schedules with labor leveling, shutdown window clustering, and ICS calendar export.

Prevent labor peaks and balance recurring inspection schedules across maintenance crews. Open Tool →
Intermediate Batch 2

Asset Criticality Ranking (5x5 Matrix)

Configurable 5x5 risk evaluation weighting Safety, Environmental, Production, Quality, and Direct Repair costs into A/B/C classes.

Classify plant machinery into A, B, and C priority tiers with tailored maintenance strategies. Open Tool →
Intermediate Batch 3

P-F Interval & Inspection Planner

Calculate condition-based inspection intervals from failure warning timelines and condition monitoring detection probabilities.

Establish non-destructive inspection frequencies that guarantee early failure detection. Open Tool →
Advanced Batch 3

RCM-Style Decision Worksheet

Document Functions, Functional Failures, Failure Modes, and Consequences with classical task selection logic.

Conduct structured Reliability Centered Maintenance decision audits on critical systems. Open Tool →
Foundational Batch 3

Maintenance Strategy Decision Tree

Interactive decision tree selecting between Run-to-Failure (RTF), Time-Based PM, CBM, or Redesign.

Select the most cost-effective maintenance strategy based on failure pattern and detectability. Open Tool →

Root Cause & Risk 4

FMEA/FMECA, 5-Why root cause branching, Ishikawa fishbone diagrams, and CAPA.

Intermediate Batch 1

FMEA / FMECA Risk Worksheet

Failure Mode & Effects Analysis with Severity, Occurrence, Detection, Risk Priority Numbers (RPN), and MIL-STD-1629 criticality.

Rank system failure modes by risk priority and assign mitigation actions with XLSX/PDF exports. Open Tool →
Foundational Batch 2

5-Why Root Cause Tree

Structured multi-branching 5-Why investigation workspace with root-cause validation rules and corrective action links.

Drill past superficial symptoms to uncover systemic and management process root causes. Open Tool →
Foundational Batch 2

Ishikawa Fishbone Diagram

Interactive cause-and-effect diagram builder with 6M (Manufacturing) and 8P (Process) presets and SVG/PNG export.

Map all potential causes across Machine, Method, Material, Manpower, Measurement, and Milieu. Open Tool →
Foundational Batch 3

Corrective Action Tracker (CAPA)

Private, in-browser corrective and preventive action board with due-date tracking, ownership, and CSV backup.

Ensure root cause corrective actions are implemented, verified, and closed out on time. Open Tool →

Spares & MRO Inventory 3

ABC-VED spares criticality matrix, Poisson stock levels, and MRO turnover KPIs.

Intermediate Batch 1

Spare Parts ABC & VED Matrix

Dual-axis inventory classification combining ABC annual dollar usage with VED (Vital, Essential, Desirable) criticality.

Identify high-risk Category I spare parts and optimize capital tied up in slow-moving MRO inventory. Open Tool →
Intermediate Batch 1

Poisson Spare Stock Level Optimizer

Determine exact safety stock quantities for slow-moving parts to meet target Cycle Service Levels without over-stocking.

Calculate safety stock, reorder point (ROP), and expected backorders using Poisson demand. Open Tool →
Intermediate Batch 3

MRO Inventory KPI Dashboard

Track inventory turnover ratio, days sales of inventory, carrying cost, and Slow-Moving & Obsolete (SLOB) stock ratios.

Measure MRO storeroom efficiency and uncover inactive inventory cash drag. Open Tool →

Cost & Economic Decisions 4

Repair vs replace EAC analysis, Life Cycle Costing (LCC), and downtime loss models.

Intermediate Batch 1

Equipment Repair vs Replace Decision

Equivalent Annual Cost (EAC) comparison with salvage value, discount rate, overhaul costs, and breakeven replacement year.

Justify asset replacement vs continued repair with defensible economic life metrics. Open Tool →
Advanced Batch 2

Life Cycle Cost (LCC) Analyzer

Multi-option total cost of ownership (TCO) model comparing Acquisition, Energy, Maintenance, Downtime, and Decommissioning.

Compare competing machinery tenders by Net Present Value (NPV) of full lifetime costs. Open Tool →
Foundational Batch 2

True Downtime Cost Calculator

Quantify lost margin, idle direct labor, scrap, customer SLA penalties, and restart losses per event and per operational year.

Calculate accurate cost per minute of unplanned downtime to support reliability business cases. Open Tool →
Intermediate Batch 3

Maintenance Project ROI & Payback

Calculate financial Return on Investment (ROI), Payback Period, Net Present Value (NPV), and Internal Rate of Return (IRR).

Prove the financial return of reliability improvements, CBM tools, or storeroom re-engineering. Open Tool →

Mechanical Engineering Reference 2

ISO 281 L10 bearing life calculator and sinusoidal vibration unit conversions.

Intermediate Batch 2

ISO 281 Bearing Life (L10 & L10h)

Calculate basic rating life L10 (million revs) and L10h (operating hours) for ball and roller bearings with ISO 281 a1 factors.

Estimate fatigue life and assess bearing sizing under radial, axial, and dynamic load conditions. Open Tool →
Foundational Batch 2

Vibration Unit Converter (Acc / Vel / Disp)

Convert sinusoidal vibration signals between Acceleration, Velocity, and Displacement across RMS, Peak, and Peak-to-Peak.

Translate spectrum analyzer readings between g, m/s², mm/s, in/s, µm, and mils instantly. Open Tool →

Work Management & KPIs 2

EN 15341 / SMRP standard maintenance KPIs and client-side work order tracker.

Intermediate Batch 2

EN 15341 / SMRP Maintenance KPI Dashboard

Standardized maintenance performance metrics: Schedule Compliance, PM Compliance, Planned Work %, Backlog (weeks), and MTBF/MTTR.

Benchmark your maintenance operation against world-class industry standards with clear guidance ranges. Open Tool →
Intermediate Batch 3

Offline Work Order Tracker (CMMS-Lite)

Local-first offline maintenance log for work orders, preventative tasks, technician hours, and spare parts.

Manage day-to-day work orders securely in your browser with zero subscription or server setup. Open Tool →
Knowledge Base & Methodology

Reliability & Maintenance Engineering Guides

Deep-dive technical documentation on governing international standards (ISO, IEC, SAE), mathematical derivations, and industrial implementation best practices.

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.