What Actually is Torque?

At its core, torque is rotational force. It is the measure of how much a specific force acting on an object causes that object to rotate around a pivot point or axis.

If you have ever used a wrench, you already intuitively understand this. The length of the wrench acts as a lever arm. The force your hand applies to the handle creates torque at the bolt head.

• Longer wrench + same force = More torque.
• Same wrench + more force = More torque.

This relationship between distance and force is exactly how our measurement units get their names.

Newton-Meters vs. Foot-Pounds

The world of mechanics is split largely between two primary systems: the SI (International System of Units) and the Imperial system.

The Newton-Meter (N·m)

This is the global standard for scientific and engineering applications. One newton-meter is exactly what it sounds like: the torque created by applying a force of one Newton perpendicularly to the end of a one-meter-long lever. You will see N·m used almost exclusively on modern automotive specifications, precision electronics, and imported heavy machinery.

The Foot-Pound (ft-lb)

Primarily used in the United States and the UK, the foot-pound operates on the exact same logic. It represents one pound of force applied at a right angle to a lever that is one foot long.

An Expert Note on Phrasing: If you spend time on engineering forums, you will often see debates about “foot-pounds” versus “pound-feet” (lb-ft). Technically speaking, pound-feet is the correct nomenclature for torque, while foot-pounds measures work or energy. However, in automotive garages, hardware stores, and general industry, “ft-lbs” has become the universally accepted shorthand for torque. This calculator supports the widely used ft-lbs standard to align with the real-world specs you’ll find in manuals.

The Conversion Formulas

If you need to program these conversions into a spreadsheet or run them manually, you can use the exact multipliers that power the calculator above.

To convert Newton-Meters to Foot-Pounds:
Torque (ft-lbs) = Torque (N·m) × 0.73756215

To convert Foot-Pounds to Newton-Meters:
Torque (N·m) = Torque (ft-lbs) × 1.35581795

Other Common Base Conversions:
1 N·m = 10.197162 Kilogram-force centimeters (kgf·cm)
1 N·m = 0.101972 Kilopondmeters (kgm)
1 N·m = 1 Joule per radian (J/rad)

Navigating the Specialty Units

Kilogram-force centimeters (kgf·cm): Commonly found in older Japanese service manuals, robotics, and smaller mechanical assemblies. Because a centimeter is a much shorter lever arm than a meter, the resulting numerical values are much higher for the same amount of torque.

Joules per radian (J/rad): This is where physics gets interesting. A Joule is a unit of energy (work), not force. However, physically speaking, a Newton-meter is dimensionally equivalent to a Joule. In advanced physics and rotational mechanics, torque is sometimes expressed as energy per angle of rotation (Joules per radian). For practical conversion purposes, 1 N·m is exactly equal to 1 J/rad.

Kilopondmeters (kgm): A “kilopond” is another term for a kilogram-force. This unit was heavily used in European automotive engineering in the mid-20th century before the strict adoption of the modern SI system. If you are restoring vintage German or Italian vehicles, you will frequently run into kgm torque specs.