Conversion Calculator
Nm to ft-lbs Converter
Convert torque values between Newton-meters (Nm) and foot-pounds (ft-lbs) instantly using the exact conversion factor. Whether you're working with automotive torque specs, power tools, or engineering specifications, this converter handles both directions — Nm → ft-lbs and ft-lbs → Nm — with a clear step-by-step breakdown.
Nm to ft-lbs Converter
Convert torque between Newton-meters and foot-pounds
Common torque values
Results
Enter a torque value to convert
How Nm to ft-lbs Conversion Works
Torque measures the rotational force applied around an axis. Both Newton-meters and foot-pounds express the same physical quantity — they differ only in the unit systems used to measure force and distance.
The conversion factor is derived directly from the definitions of their base units:
- 1 pound-force (lbf) = 4.4482216152605 Newtons
- 1 foot = 0.3048 metres
- Therefore: 1 ft-lb = 4.4482216... × 0.3048 m = 1.3558179 Nm
- And: 1 Nm = 1 / 1.3558179 = 0.7375621 ft-lbs
Conversion Formulas
Newton-meters → Foot-pounds
ft-lbs = Nm × 0.7375621493
Foot-pounds → Newton-meters
Nm = ft-lbs × 1.3558179483
Example Calculations
Example 1 — Nm to ft-lbs (Wheel Lug Nuts)
Torque spec: 120 Nm → convert to ft-lbs
ft-lbs = 120 × 0.7375621493
ft-lbs = 88.507...
Result: 88.51 ft-lbs
Example 2 — ft-lbs to Nm (American Spec)
Torque spec: 150 ft-lbs → convert to Nm
Nm = 150 × 1.3558179483
Nm = 203.372...
Result: 203.37 Nm
Example 3 — Nm to ft-lbs (Spark Plugs)
Torque spec: 25 Nm → convert to ft-lbs
ft-lbs = 25 × 0.7375621493
ft-lbs = 18.439...
Result: 18.44 ft-lbs
Nm to ft-lbs Reference Table
| Newton-meters (Nm) | Foot-pounds (ft-lbs) |
|---|---|
| 50 Nm | 36.88 ft-lbs |
| 100 Nm | 73.76 ft-lbs |
| 120 Nm | 88.51 ft-lbs |
| 150 Nm | 110.63 ft-lbs |
| 200 Nm | 147.51 ft-lbs |
| 250 Nm | 184.39 ft-lbs |
| 300 Nm | 221.27 ft-lbs |
| 400 Nm | 295.02 ft-lbs |
| 500 Nm | 368.78 ft-lbs |
Torquing Fasteners Safely
Always verify the torque unit in your vehicle's service manual before torquing a fastener. A mix-up between Nm and ft-lbs can result in over-tightening (stripping threads, warping components) or under-tightening (loose critical fasteners, leaks). For critical fasteners like head bolts and wheel lugs, use a calibrated click-type or digital torque wrench — never estimate by feel.
Frequently Asked Questions
- What is the difference between Newton-meters (Nm) and foot-pounds (ft-lbs)?
- Both Newton-meters and foot-pounds measure torque — the rotational force applied around an axis. Newton-meters (Nm) is the SI (metric) unit, while foot-pounds (ft-lbs) is the imperial/US customary unit. One foot-pound is the torque produced by a force of one pound-force applied at a perpendicular distance of one foot. One Newton-meter is the torque produced by a force of one Newton at a distance of one metre.
- What is the exact conversion factor from Nm to ft-lbs?
- The exact factor is 1 Nm = 0.7375621493 ft-lbs. Inversely, 1 ft-lb = 1.3558179483 Nm. These factors are derived from the definitions of the pound-force (lbf) and foot in terms of SI units: 1 lbf = 4.4482216152605 N and 1 foot = 0.3048 m, giving 1 ft-lb = 4.4482216152605 × 0.3048 ≈ 1.3558179 Nm.
- Why is Nm used in some torque specs and ft-lbs in others?
- The unit used depends on the region and industry standard. European vehicle manufacturers (BMW, Mercedes, Volkswagen) and most modern repair manuals specify torque in Newton-meters. American manufacturers (Ford, GM, Chrysler) and many aftermarket manuals use foot-pounds. Motorcycles, bicycles, and precision equipment often use Newton-meters due to their finer scale. Always confirm the unit in your repair manual before torquing a fastener.
- What are typical torque values for common automotive fasteners?
- Common torque specifications: Wheel lug nuts (120–140 Nm / 88–103 ft-lbs), cylinder head bolts (70–100 Nm / 52–74 ft-lbs), spark plugs (20–30 Nm / 15–22 ft-lbs), oil drain plug (25–35 Nm / 18–26 ft-lbs), caliper bolts (25–35 Nm / 18–26 ft-lbs). Always refer to the manufacturer's specification for your specific vehicle — torque values vary significantly between models.
- Is ft-lbs the same as lb-ft?
- Yes — foot-pounds (ft-lbs), pound-feet (lb-ft), and ft·lb all refer to the same unit of torque. The naming convention varies between manufacturers, countries, and publications, but they all represent the same physical quantity. The SAE standard uses "lb-ft" while popular usage often writes "ft-lbs". This converter uses "ft-lbs" as it is the more commonly searched term.
- How do I convert inch-pounds (in-lbs) to Nm?
- Inch-pounds are used for smaller fasteners. 1 in-lb = 0.112985 Nm. To convert: multiply your in-lb value by 0.112985. Conversely, 1 Nm = 8.8507 in-lbs. For example, 60 in-lbs = 60 × 0.112985 ≈ 6.78 Nm. Small engine components, precision electronics, and torque-sensitive assemblies often specify values in in-lbs.