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Unit Conversion & Everyday Life

Torque Converter

Convert torque between newton-metres, pound-force feet and inches, kilogram-force metres and ounce-force inches.

Your inputs

Results

100 lbf·ft in N·m

135.581794833 N·m

Conversion type
Exact (from defined constants; display rounded to 12 significant figures)
1 lbf·ft =
1.35581794833 N·m

✓Exact calculation — rounded only for display

100 lbf·ft in all torque units9 rows
UnitValue
Newton-metre (N·m)135.581794833
Kilonewton-metre (kN·m)0.1355817948
Newton-centimetre (N·cm)13,558.1794833
Kilogram-force metre (kgf·m)13.8254954376
Kilogram-force centimetre (kgf·cm)1,382.54954376
Pound-force foot (lbf·ft)100
Pound-force inch (lbf·in)1,200
Ounce-force inch (ozf·in)19,200
Dyne-centimetre (dyn·cm)1,355,817,948.33

What this calculator does

Torque specs for bolts and engines appear in both N·m and lb·ft.

Formula and method

1 lbf·ft = 4.4482216152605 N × 0.3048 m ≈ 1.35582 N·m

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Value: 100
  • From: Pound-force foot (lbf·ft)
  • To: Newton-metre (N·m)

Results

  • 100 lbf·ft in N·m: 135.581794833 N·m
  • Conversion type: Exact (from defined constants; display rounded to 12 significant figures)
  • 1 lbf·ft =: 1.35581794833 N·m

How to read the results

100 N·m is about 73.76 lbf·ft.

Assumptions and limitations

  • Constants follow NIST SP 811 and the SI Brochure. Conversions marked exact follow from defined values; display is rounded to 12 significant figures.

Questions

Is lb·ft the same as ft·lb?

For torque they are used interchangeably; ft·lbf is also used for energy.

Sources

Methodology and verification

Result type
Exact mathematical calculation (rounded only for display)
Formula version
1.0
Automated verification
7 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

Privacy

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