The calculation, without hidden assumptions
Torque pairs force with a lever arm, so service manuals and engineering documents regularly switch between newton metres, pound-force feet, pound-force inches and kilogram-force units. MAXScanner converts through N·m, shows every supported equivalent at once, and deliberately labels the imperial units as force-distance units so they are not confused with energy. The numerical dimension N·m also appears in energy, but torque is a rotational moment and should not be relabelled as joules.
How to use this calculator
Enter the torque exactly as it appears in the specification and choose its unit.
Choose the wrench/manual unit you need and use the all-equivalent grid to compare N·m, lb·ft, lb·in and kgf units at once.
Increase displayed precision for calibration or small fastener values, but keep the source specification tolerance and rounding rules authoritative.
Where people use it
- •Automotive service-manual torque conversion
- •Fastener and tooling specifications
- •Mechanical design and test documentation
- •Converting small torques between lb·in, oz·in and N·m
Example: 100 N·m to lb·ft
Using 1 lbf·ft = 1.3558179483314 N·m, 100 N·m equals about 73.7562 lbf·ft. The same torque is also about 885.0746 lbf·in.
What the result does not assume
- •This converts units only; it does not prescribe a fastener tightening torque. Use the manufacturer or engineering specification for the required torque.
- •Torque and energy can share the algebraic dimension N·m, but they represent different physical quantities and should be named differently.
Frequently asked questions
How many lb-ft is 1 N·m?+
One newton metre is about 0.73756215 pound-force foot.
How do I convert ft-lb to N·m?+
Multiply pound-force feet by about 1.3558179483 to obtain newton metres.
Is N·m the same as a joule?+
They have the same dimensional product of force and distance, but N·m is used for torque while joule is used for energy/work. Context and quantity are different.
Why include lb-in and oz-in?+
Small fasteners, instruments and actuators often use smaller imperial torque units where lb·ft would be inconveniently small.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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Keep the result connected to the real job
MAXScanner keeps the formula and assumptions beside the result so you can verify the number before using it in a drawing, estimate, specification, worksheet or document. Where a supplier, manufacturer, drawing or applicable standard owns a requirement, that source remains authoritative.