Motor Sizing & Torque Calculator

Calculate motor specifications for robotics applications. Determine torque requirements, power consumption, gear ratios, and optimize motor selection for drones, rovers, arms, and autonomous systems.

Select Calculation Type

Torque Calculation

Calculate torque based on force and lever arm distance: τ = F × d

Force (N)

Lever Arm Distance (m)

Result Unit

Result: 0.5000N·m

Motor Selection Guide

Drone & Multirotor

•Typical Motor: BLDC 2200-4500 KV
•Torque: 0.1-0.5 N·m
•Power: 50-500W per motor
•Application: Aerial platforms

Robotic Arm

•Typical Motor: BLDC/Stepper
•Torque: 5-50 N·m per joint
•Speed: 50-500 RPM
•Application: Manipulation tasks

Mobile Rover

•Typical Motor: DC/BLDC 100-500 KV
•Torque: 1-20 N·m
•Power: 100-1000W total
•Application: Ground traversal

Collaborative Robot

•Typical Motor: Servo BLDC
•Torque: 2-30 N·m
•Precision: 0.1 degree
•Application: Human-safe tasks

Motor Selection Tips

Tip 1: Add a 20-30% safety factor to your calculated torque and power requirements

Tip 2: Consider thermal dissipation and cooling for continuous operation

Tip 3: Match motor voltage to your power supply and battery system

Tip 4: Account for gear friction and mechanical losses in your calculations

Tip 5: Test with actual loads before deploying in critical applications

Tip 6: Monitor current draw to detect mechanical binding or overload conditions

Explore More Tools

Checkout our Unit Converter and other engineering tools for robotics design.

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