Required Torque Calculator

Load (kg or N): Radius / Pulley Diameter (m): Friction Factor (optional, default 1.0): Service Factor (optional, default 1.5):

Required Torque for Application Calculator – Free Online Tool

This Required Torque Calculator makes it easy to work out the torque needed at a shaft for your application. By entering just a few key values, the tool instantly calculates the required torque in Newton-meters (Nm), helping you size gearboxes, motors, and drive systems correctly.

How to Use the Calculator

Follow these simple steps to calculate required torque:

Enter Load: Input the load acting on the system. You can enter the value in kilograms (kg) or Newtons (N). If entered in kg, the calculator will automatically convert it to Newtons.
Enter Radius: Provide the effective radius or pulley diameter in meters (m). This is the distance from the shaft center to where the load is applied.
Set Friction Factor: Adjust for frictional resistance in the system (default = 1.0). Increase this if you expect extra friction in bearings, guides, or belts.
Apply Service Factor: Add a safety margin for duty cycles and shock loads (default = 1.5). This ensures the calculated torque accounts for real-world conditions.
Calculate: Press the Calculate button to instantly see the required shaft torque (Nm).

What the Results Show

Load Force (N): The effective force acting on the shaft after converting mass to force.
Adjusted Torque: The torque requirement including friction and service factors.
Final Required Torque (Nm): The safe torque value you should use for gearbox or motor sizing.

Why Use This Tool?

Correct torque calculation is essential in mechanical design. Underestimating torque can lead to equipment failure, while oversizing components increases cost unnecessarily. This calculator ensures quick, accurate results for engineers, OEMs, and maintenance teams working with conveyors, winches, hoists, mixers, and pulley-driven systems.

Get Started Now

Enter your load, radius, friction, and service factor above, and click Calculate to instantly determine the torque required for your application. For more resources, try our Gear Ratio Calculator or Output Torque Calculator.