# ReliabilityTools - Engineering Directory
> Free industrial reliability engineering calculators for maintenance engineers

ReliabilityTools provides 46 free browser-based calculators for MTBF, MTTR, Weibull Analysis, FMEA, OEE, Life Cycle Cost, Spare Parts Optimization, and advanced industrial reliability engineering.

## Tool Categories & Description

### Core Reliability Calculators
- **MTBF / MTTF Calculator**: Calculate Mean Time Between Failures for repairable systems and Mean Time To Failure for non-repairable components.
- **MTTR Calculator**: Determine Mean Time To Repair and analyze maintainability trends.
- **Availability Calculator**: Calculate operational availability based on MTBF and MTTR.
- **Confidence Interval (MTBF)**: Statistical bounds for MTBF using Chi-Square distribution (Lower/Upper bounds).

### Statistical Failure Analysis
- **Weibull Analysis**: Advanced life data analysis to determine failure modes (Infant Mortality, Random, Wear Out) using Beta (shape) and Eta (scale) parameters.
- **Reliability Growth (Duane/Crow-AMSAA)**: Track reliability improvement over time during development or testing.
- **Hazard Rate Calculator**: Instantaneous failure rate modeling.
- **Poisson & Binomial Distribution**: Reliability modeling for discrete events and spare parts.
- **Markov Chain Modeling**: State-transition probability for complex redundant systems.

### System Modeling & Risk
- **RBD Builder (Reliability Block Diagram)**: Visual modeling of series and parallel system reliability.
- **FMEA Worksheet & RPN Calculator**: Failure Mode and Effects Analysis with Risk Priority Number (S x O x D) ranking.
- **Fault Tree Analysis (FTA)**: Top-down deductive failure path logic.
- **Fishbone Diagram (Ishikawa)**: Root Cause Analysis (RCA) visual mapping.
- **K-out-of-N Redundancy**: Reliability of systems requiring a minimum number of operating units.
- **SIL Verification**: Safety Integrity Level (PFDavg) verification for safety instrumented systems.

### Maintenance & Asset Management
- **Optimal Replacement Age**: Cost-based optimization (Cp vs Cf) to determine the best preventive maintenance interval.
- **Spare Part Estimator**: Poisson-based inventory optimization for critical spares and reorder points.
- **Life Cycle Cost (LCC)**: Total Cost of Ownership (TCO) comparison for Capex and Opex.
- **OEE Calculator**: Overall Equipment Effectiveness (Availability x Performance x Quality).
- **PM Scheduler**: Usage-based preventive maintenance frequency planner.
- **EOQ Calculator**: Economic Order Quantity for warehouse optimization.

### Component-Specific Tools
- **Gearbox Reliability (AGMA)**: Reliability factors for mechanical gear trains.
- **Lubricant Life Optimizer**: Remaining useful life based on Arrhenius rate and contamination levels.
- **Unit Converter**: Engineering conversions for reliability metrics.

## Resources & Education
- **Learning Center**: Deep-dive guides on RCM (Reliability Centered Maintenance), FMEA, and Statistical Analysis.
- **Knowledge Hub**: Case studies on textile, chemical, and automotive plant reliability improvements.
- **Glossary**: 50+ reliability engineering terms defined (ALARP, Beta, RBD, etc.).
- **Methodology**: Technical references for all formulas based on ISO/IEC standards.

## Usage Note
All tools are client-side only. No data is stored on servers. No signup required.

## Target Audience
Reliability Engineers, Maintenance Managers, Asset Managers, Plant Engineers, SREs, and Industrial Engineering Students.

## Site Metadata
- **Domain**: https://reliabilitytools.co.in/
- **Author**: Anil Sharma
- **License**: Free for professional and educational use.