About this tool

ReliabilityBench is a free engineering workbench for reliability engineers, maintenance teams, asset managers, and MRO professionals.

It provides 29 practical calculators covering MTBF, MTTR, failure rate, equipment availability, OEE, system reliability, Weibull analysis, downtime cost, maintenance ROI, repair-versus-replace decisions, safety stock, reorder points, and spare-parts planning.

Each calculator includes input definitions, formulas, result interpretation, practical guidance, assumptions, limitations, and links to related guides and formula references. No account or signup is required.