Convert torque between newton-meters, pound-feet, pound-inches and kilogram-force meters.
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100 N·m is about 73.75621493 lb·ft, and wheel nuts specified at 80 lb·ft are about 108.46543587 N·m. For small fasteners, 25 N·m is about 221.26864478 lb·in.
Torque is a turning force: the force applied multiplied by its distance from the pivot, so one newton-meter is one newton acting one meter from the axis. Every value converts through newton-meters, with a pound-foot at about 1.3558 N·m and a kilogram-force meter at exactly 9.80665 N·m.
Although N·m looks like the unit of energy, torque and energy are different quantities, which is why torque is not written in joules. This page converts an existing torque value; it does not work one out from a force and a lever length, and engine torque alone does not describe how fast a vehicle accelerates.
Torque is a turning force: the force applied multiplied by its distance from the pivot. One newton-meter is one newton acting one meter from the axis. A pound-foot is about 1.3558 N·m, so 100 N·m is about 73.75621493 lb·ft, and 1 kN·m is about 737.56214928 lb·ft. Although N·m looks like the unit of energy, torque and energy are different quantities, which is why torque is not written in joules.
Car wheel nuts are often specified around 80 lb·ft, which is about 108.46543587 N·m, but always use the exact value from the vehicle handbook. Small fasteners are specified in pound-inches in US manuals: 25 N·m is about 221.26864478 lb·in, twelve times the lb·ft number. Confusing lb·in with lb·ft is a common way to overtighten and snap bolts, so read the unit on the torque wrench scale before setting it.
Some older Japanese and European manuals list torque in kilogram-force meters. One kgf·m is exactly 9.80665 N·m, so 10 kgf·m is 98.0665 N·m, and an engine producing 120 N·m makes about 12.23659456 kgf·m. Engine torque and power are related through rotational speed; torque alone does not describe how fast a vehicle accelerates. Tighten critical fasteners with a calibrated wrench, clean threads and the lubrication condition the specification assumes.
| Input | Result |
|---|---|
100 N·m → lb·ft | 73.75621493 |
80 lb·ft → N·m | 108.46543587 |
25 N·m → lb·in | 221.26864478 |
10 kgf·m → N·m | 98.0665 |
120 N·m → kgf·m | 12.23659456 |
1 kN·m → lb·ft | 737.56214928 |
Read the unit on the torque wrench scale before setting it, because the pound-inch number is twelve times larger than the pound-foot one: 25 N·m is about 221.26864478 lb·in. US manuals often specify small fasteners in pound-inches, and treating those figures as pound-feet is a common way to overtighten and snap bolts.
Some older Japanese and European manuals list torque in kgf·m. One kgf·m is exactly 9.80665 N·m, so 10 kgf·m is 98.0665 N·m, and an engine producing 120 N·m makes about 12.23659456 kgf·m. The conversion is exact, so an old specification can be used with a modern wrench.
The exact value from the vehicle handbook, not a general rule. Around 80 lb·ft, about 108.46543587 N·m, is typical, but it varies by car and wheel type. Use a calibrated wrench, clean threads and the lubrication condition the specification assumes, since a dry or oiled thread changes the clamping force for the same torque.