What is being measured?
Torque is a turning moment. Although torque and energy can share dimensions, they represent different physical quantities and are kept separate.
Convert compatible measurements of the same quantity. A unit conversion does not infer a new physical property.
Meaning of lbf·ft
pound feet uses the symbol lbf·ft in this library and measures torque. Under the stated reference convention, 1 lbf·ft = approximately 1.35581794833 N·m. This equivalence changes how a known value is written. It does not increase measurement accuracy or establish whether a measurement is appropriate to a real application.
Conversion method
Multiply the value by the source factor (1.3558179483314004), then divide by the target factor (1). The factor ratio expresses the same torque measurement in the other unit.
Worked example
For a known value of 10 lbf·ft, the reference conversion gives 13.5581794833 N·m. Converting that result back gives approximately 10 lbf·ft. This reverse check helps catch a reversed factor, but matching round-trip arithmetic alone does not independently verify a source definition.
Common reference values
| Input (lbf·ft) | Reference equivalent (N·m) |
|---|---|
| 1 | 1.35581794833 |
| 5 | 6.77908974166 |
| 10 | 13.5581794833 |
| 25 | 33.8954487083 |
| 50 | 67.7908974166 |
| 100 | 135.581794833 |
Compare one lbf·ft with other units
| Target unit | Equivalent of 1 lbf·ft | Definition guide |
|---|---|---|
| newton meters (N·m) | 1.35581794833 | Read definition |
| kilonewton meters (kN·m) | 0.00135581794833 | Read definition |
| newton centimeters (N·cm) | 135.581794833 | Read definition |
| kilogram force meters (kgf·m) | 0.138254954376 | Read definition |
| pound inches (lbf·in) | 12 | Read definition |
| ounce inches (ozf·in) | 192 | Read definition |
Precision and common mistakes
- Keep the source and target quantity consistent. A matching symbol is not enough to establish a compatible definition.
- Record the original measurement precision. Showing twelve significant digits in a table does not make a rounded input more precise.
- Check symbol capitalization, prefixes and any regional convention in the source. Use the displayed unit definition rather than a similarly named unit.
- Factors involving repeating fractions or π use finite numerical precision. Round the final answer to the precision justified by your input.
Use a working converter
- Torque converter
- Pound feet to newton meters converter
- Pound feet to newton centimeters converter
- Pound feet to pound inches converter
- Pound feet to kilogram force meters converter
- Pound feet to ounce inches converter
Source and verification scope
Examples and tables are computed from the versioned unit definitions used by the linked converters. The source access dates appear below. Computandum is independent of the cited organizations; a citation does not mean that a publisher endorses this page or an actual project.
Sources
- NIST / BIPM: NIST: unit conversion factors ↗ · 2026-10-08