ProEngTools — Free Online Engineering Calculators | Pipe Sizing, Pressure Drop, Heat Exchanger & 70+ Tools

Q: Is ProEngTools free to use?

Yes, all 70+ engineering calculators are completely free, run in your browser and require no login, download or subscription.

Q: Which engineering standards are implemented?

ISO 5167 (orifice flow), IEC 60534 (control valves), IAPWS-IF97 (steam properties), TEMA (heat exchangers), ASME VIII (vessels), CTI ATC-105 (cooling towers), Darcy-Weisbach / Colebrook-White (pipe flow), ASME PTC 19.3 (thermowells).

Q: How do I report an error or suggest a new calculator?

Use the Write to Us page. We review every message and push corrections to the live site directly via GitHub.

Q: Can results be used for final engineering designs?

These tools are for preliminary engineering and feasibility. All results must be verified by a qualified engineer against applicable codes before use in final designs.

Professional
Engineering
Calculators

70+ industry-standard calculators for process, mechanical, electrical & civil engineers. Pipe sizing, pressure drop, heat exchangers, steam tables, pump NPSH and more — built to engineering codes.

70+

Calculators

Suites

Disciplines

SI+US

Unit Systems

Free

Always

🔍 Find your calculator instantly

Popular: pipe sizing · heat exchanger · orifice ISO 5167 · NPSH · steam · cable

ProEngTools provides free online engineering calculators implementing ISO 5167 orifice flow, IEC 60534 control valve sizing, IAPWS-IF97 steam tables, TEMA / Bell-Delaware heat exchanger design, Darcy-Weisbach / Colebrook-White pipe pressure drop, CTI ATC-105 cooling tower performance and ASME PTC 19.3 thermowell analysis — all running entirely in your browser, no download or login required, supporting both SI (metric) and US Customary (Imperial) unit systems.

Frequently Asked Questions

Everything engineers want to know before using ProEngTools

Are the calculators free to use?▾

Yes — all 70+ calculators are completely free, run in your browser and require no login, registration or subscription. They work on any device with a modern browser, including offline once loaded.

Which engineering standards are implemented?▾

ISO 5167 (orifice/flow), IEC 60534 (control valves), IAPWS-IF97 (steam properties), TEMA E/F/G/H/J/X (heat exchangers), ASME B31.3/VIII (piping/vessels), CTI ATC-105 (cooling towers), Darcy-Weisbach + Colebrook-White (pipe flow), ASME PTC 19.3 (thermowell analysis), API 12J (separators).

Do calculators support both SI and Imperial units?▾

Yes. All process and fluid calculators support one-click switching between SI (metric) and US Customary (Imperial) unit systems. Results update instantly without re-entering data.

How do I report a calculation error or suggest improvements?▾

Use our Write to Us page to report formula errors, request new calculators or suggest improvements. We review every message and push corrections to the live site via GitHub. You can also open a GitHub Issue directly.

Can results be used for final engineering designs?▾

These calculators are suitable for preliminary engineering, feasibility studies, educational use and cross-checking. All results must be independently verified by a qualified registered engineer against applicable codes and standards before implementation in final designs.

Can I use the calculators offline?▾

Yes. Once a calculator page is loaded, all computation happens client-side in your browser. No internet connection is needed to perform calculations — ideal for site work and field use.

How often are the calculators updated?▾

The entire platform is maintained via GitHub. Formula corrections, UI improvements and new tools are deployed continuously. Updates go live instantly via GitHub Pages — no re-download needed.

Frequently Asked Questions

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