Mechanical Engineering Calculators & Data Tables

Engineer’s Ephemeris offers fast, accurate tools and reference tables for machining, threads and tolerances, GD&T, stress/strength, geometry, and conversions. Pick a calculator below or use the menu to jump straight to your task.

Frequently Asked Questions

Are these calculators free to use?

Yes—every tool and table is free to access, with optional app downloads.

Do the tools support metric and imperial units?

Most calculators include a units toggle and remember your last choice.

How accurate are the results?

We implement standard formulas and note assumptions; always verify for critical work.