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Fast & Practical Calculators for Engineers
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Fast & lightweight
No bloat—pure PHP/JS. Designed to run smoothly on phones and desktops.
Transparent formulas
Every calculator shows the formula and a step-by-step derivation next to results.
Export ready
Download neat PDFs or XLSX to share with clients or include in reports.
About tools
All calculators live in the left sidebar, organized in sections. Click a section, then pick any tool to start.
Tip: you can open tools directly with short links like /tool/dms, /tool/headloss, or /tool/idf.