# How to Calculate Torque (kg.cm) for Each Joint of a Robotic Arm to Select Servos

- Source: Reddit r/robotics
- Published: 2026-10-24T12:39:42.000Z
- RoboHot: https://robohot.news/en/items/aeet50l3g5q4d0r5yxsmymuzh
- Original: https://www.reddit.com/r/robotics/comments/1xe7lz2/calculate_torque_for_aram/

## Summary

A poster asks how to calculate the torque (in kg.cm) for each joint of a robotic arm using J=mgr in order to choose the most suitable servos, and gives the conversion 1 N·m ≈ 10.1 kg·cm. The post only lists the theoretical formula, without giving a specific robotic arm model, number of joints, or measured data, and hopes someone can guide how to apply the formula to a project or recommend a YouTube video explaining the basic concepts.