If you've ever used a wrench to tighten a bolt or pushed open a heavy door, you have first-hand experience with torque. In simple terms, torque is the rotational equivalent of a linear force. While a force pushes or pulls an object in a straight line, torque twists or turns it around a pivot point.

Understanding the torque definition is key to understanding how engines work, how fasteners are tightened, and much more. This guide will explain it all in simple terms.

The Official Torque Formula Explained

The amount of torque you generate is defined by a simple, powerful physics formula:

Torque = Force × Lever Arm Length

Let's break this down with a practical example: using a wrench.

• Force: This is how much pressure you apply to the handle of the wrench with your hand.

• Lever Arm Length: This is the distance from the pivot point (the center of the bolt) to the point where you are applying the force.

This is why a longer wrench makes it easier to loosen a stubborn bolt—by increasing the lever arm length, you generate more torque with the same amount of force.

What are the Units of Torque?

Since the formula is Force × Distance, the units of torque are simply a unit of force multiplied by a unit of distance. The two most common units are:

• Newton-meter (Nm): The international standard (SI unit).

• Pound-foot (ft-lbs or lb-ft): The standard unit in the United States.

Internal Link: Converting between these units is essential. For instant calculations, use our free Torque Converter.

Why Torque is So Important

Torque is a critical measurement in many fields:

• Automotive: Engine torque is what gets your car moving from a standstill. It's the raw twisting power that turns the wheels.

• Engineering: Engineers specify precise torque values for tightening bolts on everything from engines to buildings to ensure a strong, safe connection.

• Tools: Torque wrenches are used to apply a specific amount of torque to fasteners, preventing them from being too loose or too tight.

Internal Link: Wondering how this twisting force relates to speed? Read our detailed comparison: Torque vs. Horsepower: The Ultimate Explanation.

---