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Documented formulas
Each calculator page shows the formula it uses, an input glossary, and a worked example — so you can verify the math instead of trusting a black box.
About ControlsCalculator.com
Practical engineering calculators, built by a controls engineer.
ControlsCalculator.com exists for one reason: to give automation, SCADA, PLC, OT, and industrial-computing professionals fast, trustworthy engineering estimates — without opening a spreadsheet or creating an account.
Who is behind this site
ControlsCalculator.com is built and maintained by Shahid Javed, a controls and OT engineer, through Forward System Labs. The calculators come out of real commissioning and design work — the recurring sizing questions that engineers answer with a spreadsheet at 11 PM before a factory acceptance test: how much power headroom this panel needs, whether the EtherCAT cycle budget closes, how fast a historian disk fills up.
Review note for Shahid: add a sentence or two about your background here (years in industry, sectors such as manufacturing/process/OEM, certifications) before this page goes live. This placeholder is only in the draft.
The site is intentionally narrow. Instead of one generic calculator hub, each tool gets its own page with the underlying formula, a worked example with real numbers, common mistakes, and answers to the questions engineers actually ask about it.
How the calculators are built
A consistent standard applies to every calculator on the site.
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Engineer-reviewed
No calculator page is published without an engineering-accuracy review of its formulas, typical values, and advice. Corrections from readers are welcome and acted on.
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Private by design
Calculations run locally in your browser. The site does not send your calculator inputs to a server, and no account is required to use the tools.
The calculators
Eight tools, each with its own dedicated page.
What the calculators are — and are not
These calculators are planning aids: early design estimates, commissioning sanity checks, and architecture comparisons. They are not substitutes for manufacturer datasheets, applicable codes and standards, certified testing, or a professional engineering review. Final designs should always be verified against equipment documentation, site conditions, and qualified engineering judgment.
The Controls Toolkit extends the same idea into downloadable worksheets — planning templates you can keep on your laptop or in the panel shop.
Found a wrong assumption or a better typical value? Tell us — corrections from working engineers are the fastest way these tools improve.