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Engineering Torque Calculator
On Google Play: Engineering Torque Calculator
Five calculators for bolt preload, motor torque, shaft diameter and unit conversion.
Get it onGoogle PlayLast updated: October 24, 2026
- 5 calculators
- Live results
- Nm / lb-ft
- 6 languages
Screenshots
What does it do?
Engineering Torque Calculator is an all-in-one mechanical torque tool for bolts, motors, shafts and everyday lever problems. Whether you are sizing a drive, checking a fastener or converting Nm to lb-ft, you get fast and clear results.
Every screen has a built-in guide and results update live as you type. Service factor notes for fans, conveyors, crushers and heavy shock loads are included.
Features
Lever torque and units
- Torque from force, lever arm and angle
- Instant conversion between Nm, lb-ft, lb-in, kgf-m and kgf-cm
Bolt tightening torque
- Metric and inch sizes
- Property classes 8.8, 10.9 and more
- Friction for oiled or dry threads, torque and preload estimates
Motor power and torque
- Shaft torque from kW or HP and RPM
- Efficiency and service factor for smooth, moderate and shock loads
Shaft diameter
- Design mode: recommended standard diameter
- Analysis mode: strength and stiffness with bending moment, materials and hollow shafts
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