Torque Calculator

Lead Screw Torque & Motor Size Calculator

Calculate required torque from thrust, lead, and efficiency. Then optionally add speed, stroke, orientation, and safety margin for a more refined DINGS motor size recommendation.

Step 1

Basic Torque Calculator

Enter the values you know. This first step is enough to calculate torque and provide a starting motor size recommendation.

Calculated Torque

N-m 0.000
oz-in 0.0
lb-in 0.00

Starting Motor Size Recommendation

Enter thrust and lead to see a recommendation.

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Formula: Torque = Force × Lead ÷ 2π × Efficiency. This calculator converts lead to meters before calculating N-m.

These fields are optional. Add them if you want a more application-aware recommendation that considers speed, stroke, orientation, and safety margin.

Refined Application Recommendation

Optional details will refine the recommendation after Step 1 is completed.

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This tool provides a starting point for motor selection. Final sizing should consider speed, acceleration, duty cycle, driver voltage/current, orientation, column loading, critical speed, desired life, and application-specific requirements.

The thrust required is an important variable in determining the linear motion product right for the system. It is useful to determine the output
torque needed from a motor to produce the appropriate linear thrust.

The formula below is used to find the required motor rotary torque, give the Force, lead, and efficiency of the lead screw.

ACME lead screw efficiency range: 20% - 80%

Ball screw efficiency range: 85 - 95%

A formula for calculating torque from a motor, showing torque equals force times distance divided by a factor involving screw lead and efficiency.
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