🔧 Nm to Ft-Lbs Converter: Newton Metres to Pound-Feet Torque

What is the Nm to Ft-Lbs Converter?

Torque measures the twisting or turning force applied around a pivot, such as a bolt, an axle, or a crankshaft. It is the product of a force and the distance from the point of rotation at which that force acts, which is why its units always combine a force unit with a length unit. In the metric (SI) system torque is measured in newton metres (N.m): one newton of force applied one metre from the pivot. In the imperial and US customary system the common unit is the pound-foot (ft.lb, also written lb.ft): one pound of force applied one foot from the pivot. Because these describe the same physical quantity, converting between them is a fixed multiplication.

The exact conversion factor is 1 N.m = 0.73756215 ft.lb, and going the other way, 1 ft.lb = 1.35581795 N.m. These two numbers are reciprocals of each other, so you multiply by roughly 0.7376 to go from newton metres to pound-feet, and multiply by roughly 1.3558 to go back. A quick mental estimate is that pound-feet are about three-quarters of the newton metre figure. For example, a wheel-nut spec of 120 N.m is close to 88.5 ft.lb, and a bicycle stem bolt at 5 N.m is about 3.7 ft.lb.

A point that trips people up is that the pound-foot of torque is not the same thing as the foot-pound of energy or work, even though both are written with the same two words and are numerically equal (1 ft.lb of either is 1.35581795 joules or newton metres). Torque is a rotational force and does not describe any actual movement, whereas work and energy describe a force acting through a distance. By convention, engineers usually write torque as pound-feet (lb.ft) and energy as foot-pounds (ft.lb), but the labels are used loosely in everyday life. This tool converts torque, so the newton metre it produces is a measure of turning force, not of energy.

Where this matters most is any job with a torque specification: tightening lug nuts and spark plugs on a car, assembling a bicycle or motorcycle, setting head bolts on an engine, or reading the output figures on a motor or power tool. Manufacturers publish these specs in whichever unit suits their market, so a European service manual will quote newton metres while a US torque wrench may read in pound-feet or inch-pounds. Converting accurately keeps fasteners tight enough to hold without stripping threads or shearing bolts, which is why getting the number right is worth the few seconds this converter takes.

When to use it

• Converting a car or motorcycle torque spec from newton metres in the manual to pound-feet on your torque wrench.
• Setting lug nuts, spark plugs, or head bolts to the correct tightness during a repair.
• Comparing engine or motor torque figures quoted in different units across spec sheets.
• Assembling a bicycle where component torque values are printed in N.m but your wrench reads ft.lb.
• Checking power-tool or impact-driver output ratings when the two units are mixed.
• Doing physics or engineering homework that asks you to switch torque between SI and imperial units.

How to use the Nm to Ft-Lbs Converter

1. Enter your torque value in the Newton metres (N.m) box to see the pound-feet result instantly.
2. Or type a value in the Pound-feet (ft.lb) box to convert the other way.
3. Read the highlighted result line for the full conversion in plain words.
4. Use the Swap direction button to flip the two figures, or Clear to start again.
5. Check the reference table below for common newton-metre values at a glance.

Formula & method

Worked examples

Newton metres to pound-feet (common torque values)

Pound-feet to newton metres (reverse direction)

Common mistakes to avoid

• Multiplying by the wrong factor. To go from newton metres to pound-feet you multiply by 0.7376, not 1.3558. Using the reverse factor by mistake inflates the result by roughly 84 percent. Remember that pound-feet are smaller numbers than the same torque in newton metres.
• Confusing pound-feet of torque with foot-pounds of energy. A pound-foot of torque and a foot-pound of energy are numerically equal but describe different things. Torque is a twisting force; energy is work done over a distance. This converter handles torque, so do not use it to convert units of work or heat.
• Mixing up pound-feet and inch-pounds. Many small fasteners are specified in inch-pounds, not pound-feet. There are 12 inch-pounds in one pound-foot, so treating an inch-pound spec as a pound-foot value would tighten a bolt twelve times too hard.
• Over-rounding before you tighten. Rounding a spec too aggressively can put you outside the manufacturer tolerance. Keep at least one or two decimal places when the value is small, since a fraction of a pound-foot matters on delicate components like bicycle parts.

Glossary

Torque

A twisting or turning force applied around a pivot, equal to force multiplied by the distance from the axis of rotation.

Newton metre (N.m)

The SI unit of torque: one newton of force applied one metre from the point of rotation.

Pound-foot (ft.lb)

An imperial unit of torque: one pound of force applied one foot from the point of rotation. Also written lb.ft.

Conversion factor

The fixed number you multiply by to change units. Here it is 0.73756215 from N.m to ft.lb, and 1.35581795 the other way.

Inch-pound (in.lb)

A smaller imperial torque unit used for delicate fasteners. Twelve inch-pounds equal one pound-foot.

Foot-pound (energy)

A unit of work or energy, numerically equal to a pound-foot of torque but describing energy rather than twisting force.

Frequently asked questions