This page is designed to help you find out whether MechCodex is good and if it is the right choice for you.
MechCodex is an online toolkit of interactive mechanical engineering calculators covering machine design, strength of materials, fluid mechanics, heat transfer, thermodynamics, manufacturing and HVAC. Every calculator shows its governing equations and a worked example, in both SI and Imperial units. It also includes a searchable materials property database and standards references. Built for working engineers and engineering students.
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Calculators
300+ interactive engineering calculators covering machine design, strength of materials, fluid mechanics, thermodynamics, heat transfer, manufacturing and HVAC
Materials Database
Searchable database of 1,100+ material properties with standards references
Unit Support
SI and Imperial units with governing equations and worked examples shown for every calculation
Transparent calculations
Every result shows the full derivation: governing equations, substitution steps, and a worked example. No black boxes.
Theory with every calculation
The engineering theory behind the math, not just plug-and-chug formulas
Learn library
In-depth explainers on strength of materials, machine design, thermofluids, and more
Side-by-side comparisons
Materials, grades, and design options compared on one screen
Charts and plots
Visual curves showing how results change with your inputs
Standards references
Calculations cite the governing standard
SI and Imperial together
Every calculator works in both unit systems
Free, no signup needed
The full toolkit is free to use without an account
Reference tables
Quick-lookup tables for material properties, insulation values, standards data, and conversions, alongside the calculators.
Because the answer comes with proof. Every calculation shows its derivation and cites the governing standard, in SI and Imperial side by side. It's the difference between getting a number and understanding it — free, no account needed.
Working mechanical engineers who need a fast, verifiable answer on the job, and engineering students who want to see the derivation behind the formula — not just the final number.
A modern web stack: Next.js and React on the frontend, with KaTeX for rendering math and a Postgres-backed database for the materials property lookups.
MechCodex started in December 2025 — "The Engineer's Toolkit" — built by a working mechanical engineer who wanted a calculator that shows its work: every result backed by the governing equations and a worked example, free for everyone.
Two things: every calculator shows the complete derivation — equations, steps, worked example — so you verify instead of trust. And the calculators sit next to a searchable materials property database and standards references, so the data you need is already there. All free, no signup.
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