
If you’ve worked in reliability or maintenance for any length of time, you’ve probably sat through a meeting where someone asks “so how many spares do we need?” and the answer is basically “well, we’ve always kept two on the shelf.” Or the classic PM frequency debate — why is it every 6 months? Because it’s always been every 6 months.
That kind of thing bugged me. Not because people are lazy, but because the right tools to do it properly are usually locked behind expensive software or buried in a textbook somewhere. So I built four free, browser-based calculators that cover the core decisions reliability engineers deal with all the time. No logins, no licence fees, no fluff. [Read more…]


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