Observed arrival · 2026-09-23

MaintBench: engineering calculators for plant work

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Editorial interest 77/100 Selection signal · not a rating of the site

A free, no-sign-up library of maintenance engineering calculators, unit converters, and downloadable templates.

Landing page captured for the 2026-09-23 issue.

For: Maintenance, reliability, and plant engineers
Worth noticing: It lists 87 quick conversions alongside 11 free Word and PDF templates, including lockout tags and permits to work.

Field notes

The homepage groups its 114 calculators across eight categories, including 24 electrical-and-controls tools, 23 mechanical-and-drives tools, and 14 maintenance-and-reliability tools. It also lists 87 quick conversions and 11 free Word/PDF templates covering items such as lockout tags, risk assessments, permits to work, and PM checklists; formulas are said to appear on every calculator page.

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