GridCalc Pro

GridCalc Pro is an offline electrical calculation workspace for engineers, electricians, designers, and commissioning teams. Calculate and review: • EV charging feeder comparisons and cable screening using your sourced conductor parameters • Three-phase power, current, and voltage • Voltage drop with AWG, kcmil, or mm² conductor input • Transformer load and capacity conversions • CT and PT nameplate ratios with safety warnings • Power-factor correction • Electrical and engineering unit conversions • PV string/inverter and battery/PCS nameplate pre-checks Built for work that must be revisited: • See formulas, intermediate steps, assumptions, and warnings • Save calculations to favorites, history, and projects • Search saved work by title, project, values, source, warning, or formula context • Restore the original inputs instead of keeping only a final number • Export calculation context and results as PDF • Work without an account or internet connection • Use English, Simplified Chinese, or Spanish • Send supported summaries to a paired Apple Watch GridCalc Pro bundles no licensed NEC tables. Create a local custom cable pack or import compatible JSON; user-supplied values remain visibly unverified in results, saved records, and PDFs. Built-in values are marked as example data. A calculation report documents inputs and results; it is not engineering approval, a design stamp, inspection acceptance, or a guarantee of code compliance. Always verify real work against the adopted code, authority having jurisdiction, approved drawings, installation conditions, equipment listings, manufacturer instructions, and a qualified professional's review.