Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Pound-force feet to Newton metres
Convert lbf·ft to N·m instantly, then review the formula, assumptions, and rounding guidance.
Force & torqueInstant result
Decimals
Formula result = input × 1.3558179483314 ÷ 1. 1 lbf·ft = 1.3558 N·m
Common examples
One value, several units
Newton metres1.3558 N·m
Kilonewton metres0.0014 kN·m
Pound-force inches12 lbf·in
Kilogram-force metres0.1383 kgf·m
Conversion table
| lbf·ft | N·m |
|---|---|
| 1 lbf·ft | 1.3558 N·m |
| 2 lbf·ft | 2.7116 N·m |
| 5 lbf·ft | 6.7791 N·m |
| 10 lbf·ft | 13.5582 N·m |
| 25 lbf·ft | 33.8954 N·m |
| 50 lbf·ft | 67.7909 N·m |
| 100 lbf·ft | 135.5818 N·m |
Conversion chart
1 lbf·ft1.3558 N·m
5 lbf·ft6.7791 N·m
10 lbf·ft13.5582 N·m
25 lbf·ft33.8954 N·m
50 lbf·ft67.7909 N·m
Worked example
1 lbf·ft equals approximately 1.35582 N·m.
Unit definition
Pound-force feet (lbf·ft) One pound-force feet equals 1.35581794833 newton metre.
Unit history
Pound-force feet is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert lbf·ft to newton metre.
3. Convert the base value to N·m and apply your display precision.
Understand the result before using it
Pound-force feet to Newton metres converts a value measured in Pound-force feet (lbf·ft) into the equivalent value in Newton metres (N·m). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 1.3558179483314 ÷ 1
Assumptions
- Pound-force feet and Newton metres represent the same torque quantity.
- The input is expressed in lbf·ft; the output is expressed in N·m.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 lbf·ft = 1.35581794833 N·m. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a lbf·ft measurement in a document that expects N·m.
- Compare a pound-force feet value with a value reported in newton metres.
- Check the lbf·ft-to-N·m arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse lbf·ft with another unit that has a similar name or symbol.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Pound-force feet to Newton metres?
result = input × 1.3558179483314 ÷ 1 Using the displayed relationship, 1 lbf·ft equals 1.35581794833 N·m.
How many Newton metres are in one Pound-force feet?
One Pound-force feet is 1.35581794833 Newton metres. The displayed digits may be rounded.
Can I reverse the lbf·ft to N·m conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts N·m back to lbf·ft.
Is the Pound-force feet to Newton metres result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.