What is torque?
Torque is a measure of rotational force. In plain language, it tells you how strongly a force can turn an object around an axis. If you use a wrench, the push you apply at the handle creates torque at the bolt. Higher torque means more twisting force.
Engineers, mechanics, and technicians use torque in nearly every field where rotating components matter: automotive repair, manufacturing equipment, aerospace assemblies, bicycle maintenance, robotics, and more.
Why torque unit conversion matters
Tools and specifications are not always published in the same unit system. A vehicle manual may specify wheel lug torque in lb-ft, while your torque wrench may display N·m. If the conversion is wrong, parts may be under-tightened or over-tightened.
- Under-torque: risk of loosening, leaks, vibration, or part failure.
- Over-torque: stripped threads, stretched bolts, warped components, and expensive damage.
- Cross-team consistency: shared specs across metric and imperial workflows.
How to use this torque conversion calculator
Step-by-step
- Enter the numeric torque value.
- Select the source unit in From Unit.
- Select a target unit, or choose All units to see a full breakdown.
- Click Convert Torque.
The calculator converts the input to Newton-meters internally, then computes the target units from that base value. This keeps the conversion path accurate and consistent.
Common torque units explained
Newton-meter (N·m)
The standard SI torque unit. Widely used in science, engineering, and most modern technical documentation.
Pound-foot (lb-ft) and Pound-inch (lb-in)
Common in U.S. automotive and industrial specifications. Small fasteners often use lb-in, while larger fasteners use lb-ft.
Kilogram-force meter (kgf·m) and kilogram-force centimeter (kgf·cm)
Seen in legacy documents and certain regional equipment standards. These are force-based units tied to kilogram-force.
Practical examples
- Car wheel lug nuts: 100 lb-ft is approximately 135.58 N·m.
- Small electronics screw: 12 lb-in is approximately 1.356 N·m.
- Bike crank bolt: 40 N·m is approximately 29.50 lb-ft.
Torque wrench best practices
- Always use the manufacturer’s torque spec for the exact component.
- Calibrate torque wrenches regularly and store them at recommended settings.
- Apply smooth force at the correct handle point.
- Use proper lubrication conditions if specified (dry vs lubricated torque differs).
- When possible, tighten in stages and use star/cross patterns for multi-bolt assemblies.
Quick reference formula
The core relationship used in this calculator is:
Torque in target unit = (Torque in source unit × source-to-N·m factor) ÷ target-to-N·m factor
Because all conversions pass through N·m, results remain reliable even when converting between less common units.