What It Is
ElectroMechCalc is a free toolkit of 90+ electrical and mechanical calculators for working engineers, technicians and maintenance teams. Each one solves a job you meet on site.
- Electrical — transformer, DG, UPS and solar sizing; cable size and voltage drop; short-circuit current; earthing; MCB, MCCB, fuse and relay settings; motor starting, star-delta, soft starter and VFD sizing; harmonics and power factor.
- Mechanical — bearing life, shaft and beam checks, bolt torque, gears, belts and chains, pump head and power, pipe pressure drop, compressors, boilers and heat exchangers.
- Maintenance guides — practical guides on DG sets, transformers, motors, VFDs, panels, pumps, boilers and more.
- Service benefits — EPF and Gratuity calculators for engineers on Indian payrolls.
Why It Exists
A transformer rating, a power-factor correction, a bearing L10 life: none of it is hard. But with a panel open or a pump skid waiting, you do not want to hunt a handbook for the right constant. I built this to put the formula, the result and the working on one page, so you can verify the number instead of trusting a black box.
What Sets It Apart
- Formula shown — every calculator displays the equation it uses, so you can check it or learn from it.
- Assumptions stated — constants and defaults follow common standards, and regional differences are noted on the page.
- Field-ready — fast, simple inputs that work on a phone beside a panel.
- Free, no sign-up — no paywall, no account.
Who It Is For
Plant and maintenance engineers, site electricians and technicians, design and project engineers, facility managers, and engineering students checking coursework.
The EPF and Gratuity calculators are there for the same audience, since service benefits are part of every engineer's planning. Both follow Indian rules and are labelled that way.
Accuracy & Limits
Every calculator uses standard, published formulas. EPF and Gratuity follow the officially published Indian rules as of the review date. These are planning and educational tools. They do not replace engineering judgment, your local electrical code, the manufacturer's datasheet or professional advice. For safety-critical or code-compliance work, always verify independently. See the Disclaimer.
Author & Editorial Standards
Created by Umasankar Maity — B.Tech in Electrical Engineering, Electrical & Mechanical Maintenance Engineer with 11+ years of experience.
Connect: Umasankar Maity on LinkedIn
- Industries: FMCG, food processing and beverage plants (CSD PET lines), power, and commercial facility operations.
- Maintenance: Preventive, predictive and breakdown maintenance of electrical and mechanical plant equipment.
- Electrical systems: HT/LT systems (33 kV / 11 kV / 415 V), substation and DG operations.
- Instrumentation: Process control and field instruments for flow, pressure, temperature and level.
- PLC: Advanced maintenance and troubleshooting on Siemens, ABB, Allen-Bradley, Omron, Beckhoff and Schneider Electric platforms, with ladder logic programming knowledge.
- Drives: Installation, commissioning and troubleshooting of VFDs and servo drives.
- Utilities: Boilers, refrigeration, HVAC, compressed air, WTP and ETP.
- Management: Team leadership, maintenance planning, spare parts management and food safety audit compliance.
Every calculator and guide on this site is built from formulas and practices used on the plant floor.
Reviewed by the ElectroMechCalc editorial team for formula accuracy and unit consistency before publishing.
Last reviewed: September 2026 | Standards referenced: IEC / IEEE / BIS
Standards & Sources
Formulas and default values are checked against these standards where they apply:
- Wiring and cables — IS 732, IEC 60364, IS 1554, and NEC Article 310 for ampacity where relevant.
- Transformers and switchgear — IEC 60076, IEC 60947, IEC 60909 (short-circuit currents).
- Motors and drives — IEC 60034-1 (ratings), IEC 60072-1 (frame sizes), NEMA MG 1.
- Earthing and power quality — IEEE 80 (grounding), IEEE 519 (harmonics).
- Mechanical — ISO 281 (bearing rating life).
- EPF and Gratuity — officially published rules at the time of review.
Where standards differ by region, the assumption used is stated on the calculator page.
Get In Touch
Found an error, or need a calculator that is not here? Send it through the Contact page. Error reports are the fastest way this site gets better.