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CalcTree
CalcTree is engineering calculation software that runs in the browser. Engineers write calculations with real units, inline Python and live links between pages, reuse a library of design-code templates, and publish print-ready calculation reports. Firms use it as a modern replacement for Mathcad, SMath Studio and spreadsheet calcs, mainly in structural and civil engineering.
- Authority
- 46 reach 0 · trust 10 · quality 21 · freshness 15
- Tier
- listed
- llms.txt
- https://www.calctree.com/llms.txt
- Sections
- 11
- Links
- 80
- Size
- 10308 bytes
- Registered
- 2016-09-24
- Country
- United States Hosting inference
- Hosting country
- United States Hosting inference
- Country evidence
- No published address evidence collected yet
- For agents
- Documentation: developer or product docs worth reading, nothing to call
- First seen
- 2026-10-23T10:25:42.424Z
- Last checked
- 2026-10-23T10:25:45.191Z
- Badge
Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-23T10:25:42.430Z. Cached copy · Source on calctree.com
# CalcTree
> CalcTree is engineering calculation software that runs in the browser. Engineers write calculations with real units, inline Python and live links between pages, reuse a library of design-code templates, and publish print-ready calculation reports. Firms use it as a modern replacement for Mathcad, SMath Studio and spreadsheet calcs, mainly in structural and civil engineering.
Key facts:
- Web-based. Nothing to install, so it works on Windows, Mac and Linux.
- Units are carried through every step of a calculation.
- Python cells sit inline with the maths, with numpy, scipy and other engineering libraries pre-installed.
- A page can call another page as a reusable subroutine, pinned to a revision, so verified calcs are reused rather than copied.
- Template library covering Australian (AS/NZS), European (Eurocode), US (ACI, AISC, AISI) and general engineering calculations.
- Real-time co-editing, comments, locking and review for designer and checker workflows.
- An AI assistant builds, explains and debugs calculations. It can be switched off.
- Integrations: Excel add-in (run CalcTree pages from Excel, single or batch), GraphQL API, and a skill for Claude and other LLMs.
- Mathcad worksheets can be imported.
- Plans: Free, Basic, Business and Enterprise. Enterprise accounts for engineering firms are priced per organisation.
## Product
- [Templates](https://www.calctree.com/product/templates): Build, publish and reuse calculation templates across projects and teams.
- [Parameters](https://www.calctree.com/product/parameters): Run quick iterations on calculations, designs and analysis with linked parameters.
- [Projects](https://www.calctree.com/product/projects): Project-level calculation management, standardisation and quality control.
- [Python](https://www.calctree.com/product/python): Fully hosted Python inside engineering calculations, with no setup.
- [Spreadsheets](https://www.calctree.com/product/spreadsheets): Build calculations and templates on a spreadsheet backend.
- [Excel add-in](https://www.calctree.com/product/excel): Run CalcTree pages directly from Excel, single or batch, with range linking.
- [API](https://www.calctree.com/product/api): Run any calculation page with new inputs from other engineering tools.
- [Pricing](https://www.calctree.com/pricing): Free, Basic, Business and Enterprise plans.
## Who it's for
- [Engineers](https://www.calctree.com/solutions/engineer): Write, check and reuse calculations in one place.
- [Engineering managers](https://www.calctree.com/solutions/manager): Quality control, transparency and standard calcs across projects.
- [Enterprise](https://www.calctree.com/solutions/enterprise): Company-wide calculation libraries, governance and report styles for multi-disciplinary firms.
- [SMEs](https://www.calctree.com/solutions/smes): Standardise calcs as a growing consultancy.
- [Individuals](https://www.calctree.com/solutions/individuals): Free calculation tools for individual engineers.
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