About Engineering Calc Tools

Engineering Calc Tools publishes free calculators for engineering students and working engineers. Each one solves a single, clearly defined problem and shows the formulas, assumptions and a worked example alongside the answer.

Why this site exists

Many online calculators give a number with no way to check it. That is risky in engineering, where a unit slip turns a 0.1 mm deflection into 100 mm. Every page here prints the equations it uses, states where they stop being valid, and walks through an example you can repeat on a sheet of engineering paper.

How each calculator is checked

• The formulas come from standard mechanics of materials and calculus references and are written out on each page.
• Results are compared with an independent method, not just re-typed formulas. Beam deflections are checked by numerically integrating M/EI with the support conditions applied; section properties are checked by numerical integration over the cross-section; derivatives are checked against finite differences; integrals against known closed-form values.
• Unit conversions use exact definitions (1 in = 25.4 mm, 1 lbf = 4.4482216152605 N).
• Each calculator carries a tool number and revision so changes are traceable.

What the calculators are not

These tools are for learning, homework checking and preliminary sizing. They do not perform code checks, apply safety factors, or replace the judgment of a licensed professional engineer. See the terms of use for details.

Found a mistake?

Corrections are taken seriously. If a result looks wrong, email hello@engcalctools.com with the page, your inputs (the “Copy link” button captures them) and what you expected. Confirmed errors are fixed and noted with a new revision number.

How the site is funded

The calculators are free to use and are supported by advertising. Ads are kept away from inputs and buttons so they never get in the way of the work. Read the privacy policy to see how advertising cookies are used.