This page is designed to help you find out whether CalcAuthor is good and if it is the right choice for you.
CalcAuthor is engineering calculation software for engineers who need to produce submission-ready calculation reports, not just get a number.
You write the calculation. CalcAuthor keeps everything around it correct as you edit:
Built for individual engineers and teams, with shared style presets so every team member's reports look consistent.
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Unit-Aware Calculations
Mixed units (kN/m, GPa, mm⁴) convert automatically within a single formula, catching unit-mismatch errors before they reach a reviewer.
Natural Math Notation
Formulas render as real typeset math — proper fractions, exponents, and italic variables — instead of plain text or spreadsheet cells.
Automatic Table of Contents
The table of contents renumbers itself as sections are added, reordered, or deleted, with no manual upkeep before submission.
Cross-References
Inline references to other sections, equations, or figures stay correct automatically as the document is edited.
Auto-Numbered Citations & References
Citing a source once numbers it correctly and keeps the reference list in sync, even when new citations are added later in the document.
Pass/Fail Result Flags
Calculated results flag their own compliance state directly next to the math, instead of requiring a separate checklist.
Auto-Numbered Figures
Diagrams get an automatically numbered caption, with a List of Figures that builds and renumbers itself as figures are added or reordered.
Cover Page & Document Control
Document number, revision, date, and sign-off blocks (Prepared, Verified, Approved) are generated automatically on every report.
Running Header & Page Numbering
Document identifiers and page counts repeat correctly on every page automatically, updating everywhere when changed once.
Word-Processor-Style Pagination
A live, Word-style page-break preview shows exactly how the document will paginate while editing, not just at export.
Custom Team Style Presets
Teams can define and share their own document styling presets, so every member's reports follow the same formatting standard.
Per-Line Notes & Code-Clause References
Individual calculation lines can carry notes or direct references to the design-code clause they satisfy.
Autosave
Work is saved automatically while editing, without requiring a manual save step.
One-Click PDF Export
Generates a submission-ready PDF report directly from the live document.
Most tools either calculate or document — not both. CalcAuthor treats the calculation and the report as one connected object: units convert automatically within a formula, and the parts of an engineering report that normally require manual upkeep — table of contents, citations, cross-references, figure numbering, running headers — update themselves as the document changes. The output is a submission-ready PDF, not a raw result that still needs formatting.
Spreadsheets don't understand units and produce no document structure. Legacy calculation tools like Mathcad require a desktop install and still leave document-level upkeep (TOC, citations, figure numbering) to the user. CalcAuthor runs in the browser, is built for teams (shared style presets, safe concurrent-editing via document locking), and turns a calculation directly into a submission-ready report without a separate formatting pass.
Structural, civil, and mechanical engineers — and the firms they work for — who need to produce calculation packages for permit submissions, peer review, or client deliverables. Both individual engineers and engineering teams.
Built on .NET 8 (C#) for the API and Blazor WebAssembly for the client, with PostgreSQL via Entity Framework Core for data. Stripe handles billing, Resend handles transactional email, and Cloudflare Turnstile protects signup from automated abuse. Hosted on Render.
CalcAuthor is used by individual structural, civil, and mechanical engineers producing calculation packages for permit submissions and client deliverables, as well as engineering teams and firms that need consistent report formatting and unit-aware calculations across multiple engineers working on the same projects.
CalcAuthor started from the day-to-day frustration of writing an engineering calculation report: switching between a calculation tool, a word processor, and a spreadsheet just to produce one document. Every edit meant redoing work by hand elsewhere — adding a section meant renumbering the Table of Contents, List of Figures, and List of Tables manually; mixing unit systems meant tracking conversions yourself with no safety net; and keeping formatting consistent across a long report meant constant re-checking instead of writing. CalcAuthor was built to collapse that into one tool, where the calculation, the units, and the document structure all stay correct automatically as the report is written.
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Check the traffic stats of CalcAuthor on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
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