Servo Sizing Calculator

Size servo motors by checking inertia ratio, RMS torque, and speed requirements for optimal motion control performance.

Load Inertia

kg·cm²

Gear Ratio

Motor Rotor Inertia

kg·cm²

Peak Torque Required

N·m

Motor Continuous Torque

N·m

Duty Cycle

Motor Max RPM

RPM

Required Motor RPM

RPM

Tab to move between fields

Inertia Ratio

1:1

Inertia MatchExcellent

Reflected Load Inertia0.5 kg·cm²

RMS Torque3.54 N·m

Est. Bandwidth100 Hz

How to Use This Calculator

Enter load inertia (kg·m²) reflected at the motor shaft and the gear ratio.
Set motor rotor inertia (kg·m²) from the motor manufacturer's specification.
Enter peak torque required (N·m) and motor continuous torque rating and duty cycle (%).
Review inertia ratio — values above 10:1 indicate potential stability issues; target below 5:1.
Check RMS torque and bandwidth (Hz) to confirm the servo meets dynamic response requirements.

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