LibreOffice for Engineers — The Complete Guide: Calc, Solver and Technical Reports for Free
LibreOffice is an open-source office suite, completely free even for commercial use, with a word processor (Writer), a spreadsheet (Calc), presentations (Impress), drawing (Draw) and an equation editor (Math). For most of an engineer's office work — calculation sheets, reports, specifications and bills of quantities — it is entirely sufficient, with no annual subscription.
LibreOffice
The Document Foundation
A full office suite — documents, spreadsheets, presentations and drawings, compatible with Office files.
Get it from the vendorCalc for engineering calculation sheets
- Engineering functions — complex numbers, unit conversion (CONVERT), statistics and matrix functions (MMULT, MINVERSE) for solving small systems of equations.
- Solver — linear and non-linear optimisation: minimising weight, fitting parameters to measured data, solving implicit equations.
- Goal Seek — finding the input that gives a target result, such as the thickness that meets an allowable stress.
- Pivot tables and charts — summarising measurement and production data, and scatter plots with trend lines.
- Macros — in Basic or Python, to automate repetitive sheets.
Writer for reports and specifications
Writer handles long documents well: heading styles, automatic numbering, tables of contents, figure captions and cross-references. Equations are written in the Math editor, and PDF export includes bookmarks, accessibility tags and a PDF/A option for archiving. Right-to-left languages are fully supported.
Compatibility with Office files
docx and xlsx files open and save without problems in most cases. Differences can appear in VBA macros, in sheets that depend on special add-ins and in documents with very complex layouts. When sending a document to a client who works in Office, check the final file once, or send a PDF.
When to use something else
When a calculation turns into long code or heavy data analysis, move to Python or GNU Octave. For reports with many equations and scientific references, LyX or Typst give a tidier result, and Zotero plugs into Writer for reference management.
Python
Python Software Foundation
The language behind most modern engineering computation, and its full ecosystem.
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GNU Octave
GNU Project
Numerical computing in MATLAB-compatible syntax — matrices, equations, signals and plots.
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LyX
LyX team
A graphical LaTeX-based document editor — theses, papers and technical reports with equations.
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Zotero
Corporation for Digital Scholarship
Reference and bibliography manager — save papers and standards, annotate PDFs and cite automatically in Word.
Get it from the vendorThe bottom line
LibreOffice will not replace every workflow built on years of Excel macros, but for a small engineering office, for students and for everyday calculation sheets it is a full, free alternative with no time limit and no account.