About CalcPanel
CalcPanel is an independent online publisher of engineering calculators and educational guides. We build interactive tools and explain the methods behind them so engineers, students, and facility staff can work through common power, HVAC, and automation calculations.
What CalcPanel is
We are a publishing organization, not a licensed engineering firm and not a design consultancy. Our role is to make well-sourced calculation methods easy to use and easy to check—not to act as the engineer of record on any project.
How we create content
Our calculators and guides are produced with AI-assisted drafting and editorial review. Calculation logic is implemented by our team against recognized engineering formulas and standards; guide text is drafted with AI assistance and then checked by editors for accuracy, clarity, and correct standard references before publication. We publish formulas with their sources and assumptions stated, and we update content when methods or codes change.
- Transparency: We state where AI assists our drafting rather than presenting every page as the work of named individual engineers.
- Review: Published material is editorially reviewed against recognized standards (see below) and against the behavior of our own calculators.
- Corrections: Errors are investigated and corrected; significant changes are noted on the page.
Our position on engineering responsibility
Calculators and guides are planning- and education-level aids. They are not a substitute for jurisdiction-stamped engineering where your project requires it. For any design affecting safety, code compliance, equipment selection, or protective coordination, have a licensed professional engineer review the inputs, assumptions, and results and stamp the drawings. Local codes, utility requirements, and site-specific conditions can override any general recommendation on this site.
Standards we align with
Our formulas and methodologies reference recognized international and U.S. standards. Listing a standard here means our content is written to be consistent with it—not that we certify compliance for your specific installation:
- IEEE: IEEE C57 series (transformers), IEEE 141 (power distribution), IEEE 519 (harmonic control), IEEE 1547 (distributed energy resources)
- IEC: IEC 60076 (power transformers), IEC 60364 (electrical installations), IEC 60909 (short-circuit currents)
- U.S. regulations: NEC / NFPA 70 (wiring and protection), DOE 10 CFR Part 431 (distribution-transformer efficiency)
- Other: NEMA standards (equipment ratings), ASHRAE 90.1 (energy efficiency) and ASHRAE load-calculation methods
What we do not claim
- We do not present named individual engineers as the authors of our pages.
- We do not claim field case studies performed by our staff; where examples appear, they are clearly identified as illustrative or teaching scenarios.
- We do not provide stamped drawings, professional sign-off, or project-specific engineering judgment.
Contact
Questions, corrections, or suggestions are welcome. Please reach us at contact@calcpanel.com or via the Contact page. Related policies: Editorial Policy and AI Content Policy.