Built by people who actually use these formulas

What ElectroMechCalc Is

ElectroMechCalc is a free collection of electrical and mechanical engineering calculators built for students, working engineers, electricians, technicians, and maintenance professionals. Every calculator on this site solves a specific, recurring field or design problem — sizing a transformer, converting kVA to kW, estimating motor current, selecting a cable, sizing a battery backup, or sizing a diesel generator — using the same standard formulas taught in engineering coursework and referenced in field handbooks.

Why We Built It

Most engineering calculations aren't complicated — a transformer kVA rating, a power factor conversion, a bearing L10 life — but doing them by hand on site, or hunting through a textbook for the right constant, wastes time that should go toward the actual job. We built ElectroMechCalc to put the formula, the calculation, and a clear explanation of how the result was reached all on one page, so the numbers can be trusted and verified rather than treated as a black box.

What Makes Our Calculators Different

• The formula is always shown — every calculator displays the exact equation used, so the result can be checked or learned, not just copied.
• No sign-up, no paywall — every calculator is free and works instantly in the browser, including on a phone with limited data on a job site.
• Standard-aligned defaults — default constants and assumptions follow common industry standards rather than arbitrary rounding.
• Built for the field, not just the classroom — fast load times and simple inputs, designed to be usable standing in front of a panel or a pump skid.

Who Uses ElectroMechCalc

Our calculators are used by electrical and mechanical engineering students checking coursework, site electricians and technicians sizing cables and breakers, plant maintenance teams estimating bearing life and pump head, and facility managers planning transformer, battery backup, or generator capacity. We've also added a small set of financial planning calculators — EPF, SIP, and CAGR — for the same audience, since many engineers and technicians also plan their own retirement and investments and wanted the same formula-first approach applied there.

Accuracy & Limitations

Every calculator uses standard, published formulas, and we cross-check our financial calculators against the methods used by official bodies like EPFO and major fund houses. That said, this site is an educational and planning tool, not a substitute for professional engineering judgment or licensed financial advice. For safety-critical, code-compliance, or high-value financial decisions, always verify results against your local electrical code or consult a qualified professional. See our Disclaimer for more detail.

Author & Editorial Standards

Sources & References

Our electrical calculators are built around formulas and default values referenced against recognized industry standards, including:

• IEC (International Electrotechnical Commission) — transformer, cable sizing, and general electrical standards.
• IEEE (Institute of Electrical and Electronics Engineers) — motor, power system, and reliability standards.
• BIS (Bureau of Indian Standards) — India-specific electrical safety and equipment ratings.
• NEC (National Electrical Code) — cable ampacity and installation practices, where applicable.

Financial calculators are cross-checked against published methods from bodies such as EPFO and major mutual fund houses. Where standards differ by region, we note the assumption used in the calculator itself. See Disclaimer for how to verify results for your own use case.

Get In Touch

Have a calculator request, found an error, or want to suggest an improvement? We'd like to hear from you — visit our Contact page to reach out.