45 free engineering & industrial tools
Free engineering, electrical, mechanical, compressor, pump and industrial calculators — built for real-world industrial work.
Convert kilowatts to horsepower using the standard 0.7457 kW/HP conversion.
Open calculator →Convert horsepower to kilowatts using the standard 0.7457 kW/HP conversion.
Open calculator →Calculate 3 phase motor current from load power, line voltage and power factor.
Open calculator →Calculate the daily, monthly and annual electricity cost of any load from its power rating.
Open calculator →Calculate shaft torque from power and rotational speed (RPM).
Open calculator →Convert bar to PSI using the standard 14.5038 PSI/bar conversion.
Open calculator →Convert airflow from cubic feet per minute (CFM) to cubic metres per minute.
Open calculator →Estimate the isothermal compression power needed for a given air flow, pressure ratio and efficiency.
Open calculator →Calculate hydraulic and shaft power required to pump water at a given flow and head.
Open calculator →Motor current, power, power factor, kVA and electricity cost tools for electrical work.
Torque, RPM, pulley, gear ratio and belt length calculators for mechanical drives.
Compressor power, running cost, receiver sizing and air leakage cost tools.
Pump power, head, flow rate and efficiency calculators for water and process pumps.
kW/HP conversions and electricity cost tools for industrial energy planning.
Bar, PSI, kPa and CFM conversions plus pipeline pressure drop estimation.
Length, temperature and pressure unit converters used daily on the shop floor.
Running cost, machine-hour rate and production cost tools for factory owners.
Industrial Calculators is a free collection of engineering calculation tools built for the people who do hands-on industrial work — electricians sizing a motor cable, technicians troubleshooting a compressor, plant engineers budgeting electricity cost, and students checking their coursework. Each tool applies a standard, named engineering formula to your input values, shows you the formula and its assumptions, and gives you a clear numeric answer in seconds instead of a page of manual calculation.
The site covers electrical calculations (motor current, power factor, kVA, electricity cost), mechanical drives (torque, RPM, gear and pulley ratios), air compressors (power, running cost, receiver sizing, leak cost), pumps (power, head, flow, efficiency), pressure and flow conversions, general unit converters, and industrial costing tools (machine-hour rate, production cost). New calculators are added regularly — every tool follows the same transparent format: formula, variables explained, a worked example, assumptions, common mistakes, and FAQs.
An industrial calculator is a tool that applies a standard engineering formula to your specific input values — for example, converting kW to HP, finding motor current, or estimating compressor power — so you get a fast, formula-accurate answer without doing the maths by hand.
Engineers, electricians, mechanics, maintenance technicians, factory owners, plant managers and engineering students all use these tools — for troubleshooting, quotations, equipment sizing, energy audits and coursework.
Yes, every calculator on this site is free to use with no signup required.
Every calculator states the exact standard engineering formula it uses, along with the assumptions behind it, so you can verify the method yourself — see each calculator's Formula and Assumptions sections.
These calculators are for estimation and planning. For safety-critical or final engineering design, always verify against the relevant engineering standard, manufacturer data and a qualified professional.