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Each free Calcs.com calculator does its own job completely. A Calcs.com trial adds the parts that come after the number: connecting results to design checks, saving your work, and exporting a report. The pattern is the same across the free tools.

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The general pattern

A free calculator gives you a result on screen. A trial adds three things:
  1. Connection to design calculators, so results flow into member checks automatically.
  2. Saving and reuse, so a section or a calculation can be used again across projects.
  3. A signed PDF report for your documentation.

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Moment of inertia calculator

The free moment of inertia calculator gives you the full property set instantly for a custom section. A trial connects that custom section directly to steel, timber, and concrete design calculators, so the properties flow into member checks automatically. You can also save sections, reuse them across projects, and export a signed PDF report.

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Section properties library

The free section library lets you look up and copy section properties. A trial connects sections directly to design calculators for steel to AS 4100 and AISC, timber to AS 1720 and NDS, and concrete. Properties flow into the member checks rather than being retyped, and you can export a signed PDF report.

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Diaphragm analysis calculator

The free diaphragm analysis calculator performs the diaphragm analysis itself. A full trial lets you link the diaphragm output directly to shear wall design calculators. You can also save calculations to a project and export a signed PDF report.

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Why the connection matters

Retyping properties or analysis results between tools is where transcription errors enter a calculation package. Linking the output to the next check keeps one set of numbers and one audit trail. It does not remove the need to review the result. The engineer still checks the assumptions, the load path, and the governing standard.

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Starting a trial

See Start Your 14-Day Free Trial for what the trial includes. The free calculators stay available whether or not you start a trial. Nothing you have entered in a free tool is lost by signing in.