Mechanical Engineering
Gear, pulley, belt, chain, torque, power, bearings.
Mechanical Engineering calculators — gear & pulley ratios, belt & chain length, RPM & torque, mechanical power & horsepower, shaft speeds, bearing L10 life, flywheel energy, and efficiency. Offline-first and print-ready.
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Most used in Mechanical.
Gear Ratio Calculator
Compute gear ratio, torque multiplier, and output rpm.
Pulley Ratio Calculator
Belt-drive pulley ratio and output rpm.
Belt Length Calculator
Open belt length between two pulleys.
RPM Calculator
Rotational speed from linear speed and diameter.
Torque Calculator
Torque from power and shaft speed.
Mechanical Power Calculator
Rotational power from torque and rpm.
Horsepower Calculator
hp ↔ W with torque cross-check.
Mechanical Efficiency Calculator
η = P_out / P_in.
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Recently added.
Mechanical Efficiency Calculator
η = P_out / P_in.
Flywheel Energy Calculator
Rotational kinetic energy of a solid disk.
Bearing L10 Life Calculator
ISO 281 basic rating life in hours.
Linear Speed Calculator
Surface speed of a rotating body.
Rotational Speed Converter
rpm ↔ rad/s ↔ Hz.
Shaft Speed Calculator
Motor synchronous speed n_s = 120·f/p.
Horsepower Calculator
hp ↔ W with torque cross-check.
Mechanical Power Calculator
Rotational power from torque and rpm.
All Mechanical Engineering
14 tools available.
Belt Length Calculator
Open belt length between two pulleys.
Gear Ratio Calculator
Compute gear ratio, torque multiplier, and output rpm.
RPM Calculator
Rotational speed from linear speed and diameter.
Torque Calculator
Torque from power and shaft speed.
Horsepower Calculator
hp ↔ W with torque cross-check.
Mechanical Efficiency Calculator
η = P_out / P_in.
Mechanical Power Calculator
Rotational power from torque and rpm.
Pulley Ratio Calculator
Belt-drive pulley ratio and output rpm.
Bearing L10 Life Calculator
ISO 281 basic rating life in hours.
Chain Length Calculator
Roller-chain link count and length.
Flywheel Energy Calculator
Rotational kinetic energy of a solid disk.
Linear Speed Calculator
Surface speed of a rotating body.
FAQ
About Mechanical Engineering.
Do results follow standard mechanical formulas?
Yes — every calculator uses Engineering-Toolbox / ISO-referenced formulas (T = 9550·P/n, ω = 2π·n/60, L₁₀ = (C/P)^p · 10⁶ / (60·n), 1 hp = 745.6999 W) shown in the results panel.
Which unit system do I use?
Formulas are unit-agnostic where possible. For belt/chain length, use consistent units for diameters and centre distance. For torque/power/rpm, use N·m, kW, and rpm as labelled.
Can I export the report?
Every calculator produces Markdown, CSV, JSON, and plain-text artifacts you can copy, download, print, or share — including step-by-step working.
Is anything sent to a server?
No. All math is pure JavaScript running in your browser. No inputs or results leave the page.
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