Free web software for construction design.

Your free engineering toolkit.

32 tools

Looking for cut & fill, concrete or rebar quantities instead of a structural design check? Try our free construction estimating calculators.

Frequently asked questions.

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Yes. All 32 tools run in your browser with no account and no usage limit. They’re free because they double as teaching material for our training courses.

They are mainly built to Eurocodes, however some such as the Slope stability calculators use widely-taught engineering formulas rather than being built to a specific code.Always have a qualified engineer verify any output before using it in a real design.

These calculators are for early-stage sizing and sanity-checking, not final design. Have a qualified engineer check and sign off on any output before it’s used in construction.

Searchable historic project data for buildings, bridges, tunnels and dams, plus a combined dataset browser — useful for benchmarking a new project against comparable completed ones.

These are free, general-purpose calculators for early-stage sizing. Civils.ai’s own product works directly from your project’s own PDF drawings and documents — quantity takeoffs, spec search and more — with QA-reviewed results, not a standalone calculation.