About

A free set of 207 engineering calculators for manufacturing and industrial practitioners, run entirely in your browser, with no advertising and no accounts.

What this is

207 calculators across 13 engineering disciplines, available in 10 languages. Everything runs in your browser: there is no server doing the arithmetic, no sign-up, and no advertising. The tools are aimed at people doing the work — process and quality engineers, machinists, fabricators, safety officers, logistics planners — rather than at students or casual visitors.

Free, and staying free

This site is free permanently, and that is a design constraint rather than a promotion. Because every calculation happens on your own device, serving the site costs almost nothing, so there is no revenue pressure that would push us toward advertising, paywalls, or harvesting usage data. We would rather the tools be trustworthy than profitable.

Who runs it

This site is built and operated by iyulab. Made in Korea, built in Seoul. For corrections, disagreements with a standard, or requests for a missing tool, write to [email protected] — reports that a number looks wrong are the most useful mail we get.

Related work

The calculation library behind these tools, formulab, is open source and can be used directly in your own projects. Forge Tools is a companion desktop application for industrial professionals, also free.