Newton Meters to Foot Pounds Converter

Quick Answer

Last updated: 11 November 2026 ·How we calculate this: NIST torque conversion factor

How This Newton Meters to Foot Pounds Converter Works

Lug nuts, spark plugs, bike stems and engine bolts all have a torque spec, but manuals and torque wrenches do not always use the same unit. Choose the direction, enter the torque and press Calculate. The converter gives foot-pounds to three decimal places (or newton meters), plus inch-pounds for small fasteners and kilogram-force meters for older metric manuals.

How to Use the Newton Meters to Foot Pounds Converter

1. Choose newton meters to foot-pounds or foot-pounds to newton meters.
2. Enter the torque.
3. Press Calculate.
4. Read the converted torque, plus inch-pounds and kgf·m.

Torque Conversion Formulas

• Definition: 1 lbf·ft = 0.3048 m × 4.4482216 N = 1.355818 N·m
• Foot-pounds from N·m: ft-lb = N·m ÷ 1.355818 = N·m × 0.737562
• N·m from foot-pounds: N·m = ft-lb × 1.355818
• Inch-pounds: 1 ft-lb = 12 in-lb; 1 in-lb = 0.112985 N·m
• kgf·m: 1 kgf·m = 9.80665 N·m

Key Terms

• Torque: a turning force, force times distance from the pivot.
• Newton meter (N·m): 1 newton acting at 1 meter.
• Foot-pound (lbf·ft): 1 pound-force acting at 1 foot.
• Inch-pound (lbf·in): 1 pound-force acting at 1 inch.
• Torque wrench: a wrench that clicks or reads out at a set torque.

Worked Example

A car’s wheel nuts should be tightened to 110 N·m, but your torque wrench reads in ft-lb.

• 110 ÷ 1.35582 = 81.13 ft-lb
• Set the wrench to 81 ft-lb
• In inch-pounds: 81.13 × 12 = 974 in-lb

Going the other way, a 25 ft-lb spark plug spec is 25 × 1.35582 = 33.9 N·m.

Real-Life Examples

• Wheels: 120 N·m lug nuts are 88.5 ft-lb.
• Engines: a 400 N·m torque rating is 295 lb-ft.
• Bicycles: a 5 N·m stem bolt is 44 in-lb.
• Electric cars: 300 lb-ft is 407 N·m.

N·m vs ft-lb

• Newton meter (N·m): the SI unit of torque.
• Foot-pound (lbf·ft): the US unit, 1.3558 N·m.
• Inch-pound (lbf·in): one twelfth of a foot-pound, for small bolts.

Newton Meters to Foot Pounds Chart

1 lbf·ft = 1.355818 N·m.

Foot-Pounds of Torque vs Energy

Torque is a turning force: a force applied at a distance from a pivot. Newton meters and pound-force feet are force times distance, so 1 ft-lb is the turning effect of a 1 pound force on a 1 foot wrench. The same combination of units can also describe energy or work, which is why engineers often write torque as lbf·ft or “pound-feet” and energy as “foot-pounds”. The numbers convert the same way, but they mean different things.

Small fasteners such as bicycle parts, valve covers and electronics use inch-pounds, because the values in ft-lb would be tiny: 5 N·m is 3.7 ft-lb but 44 in-lb. Mixing up in-lb and ft-lb is a common way to strip threads, since a 30 in-lb spec set as 30 ft-lb is twelve times too tight. Check the unit on both the manual and the wrench scale before tightening.

Many torque wrenches have two scales printed side by side, one in N·m and one in ft-lb, so you can set them directly from either unit; a converted value is most useful when the wrench has only one scale or when a manual gives a range. Click-type wrenches are most accurate in the middle of their range, so pick a wrench whose range covers the converted value comfortably rather than one at its very top or bottom.

Common Mistakes to Avoid

• Mixing in-lb and ft-lb. A 30 in-lb spec is 2.5 ft-lb.
• Dividing when you should multiply. N·m is the bigger number.
• Using 1.3 or 1.4. 1.356 keeps errors under 0.1%.
• Adding extensions without checking. Some setups change the reading.
• Tightening on oily threads. Lubrication changes clamping force; follow the manual.

Frequently Asked Questions

References & Sources