What is Torque?

Torque is a measure of the force that can cause an object to rotate about an axis. Just as force is what causes an object to accelerate in linear kinematics, torque is what causes an object to acquire angular acceleration. It is a vector quantity, and its direction depends on the direction of the force on the axis.

How to Use the Torque Calculator

To use this professional torque calculator, simply follow these steps:

1. Enter Force: Input the amount of force being applied.
2. Select Force Unit: Choose between Newtons (N), Pound-force (lbf), or Kilogram-force (kgf).
3. Enter Distance: Input the length of the lever arm or the radius from the pivot point to where the force is applied.
4. Select Distance Unit: Choose Meters, Centimeters, Feet, or Inches.
5. Calculate: Click the button to get the result instantly in Newton-meters (Nm) and Pound-feet (lb-ft).

The Torque Formula

The fundamental formula for calculating torque (τ) is:

τ = F × r × sin(θ)

Where:
τ is the torque vector,
F is the force applied,
r is the distance from the axis (the lever arm),
θ is the angle between the force vector and the lever arm. In most standard mechanical calculations, the force is assumed to be perpendicular (90 degrees), making sin(θ) equal to 1.

Common Torque Units

The SI unit for torque is the Newton-meter (N·m). In the Imperial system, common units include Pound-foot (lb·ft) or Pound-inch (lb·in). This calculator provides conversions to ensure accuracy across different engineering and automotive standards.

Frequently Asked Questions

Q: Why is torque important in cars?
A: Torque is what allows a car to move from a standstill and helps in pulling heavy loads. It represents the "grunt" or pulling power of the engine.

Q: How does distance affect torque?
A: Torque is proportional to the distance from the pivot. This is why using a longer wrench makes it easier to loosen a tight bolt—you are increasing the distance, thereby increasing the torque for the same amount of effort.