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Physics

Rod Moment of Inertia Calculator

Find inertia of a thin uniform rod about its midpoint.

SI units shown beside each fieldIdeal model explained below

Physical quantities

Runs on your device

CALCULATED QUANTITY

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter mass, rod length.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Moment of inertia = mass × length²/12.

A WORKED EXAMPLE

Using mass = 10 kg, rod length = 2 m, the result is 3.33333333 kg·m². Change these example inputs to match your task; use the method above to check each step.

What to keep in mind

Axis is perpendicular to the rod through its center. An idealized educational model using the stated SI units. Real systems may need additional forces, losses or experimental measurements. Not a safety or equipment specification.

Common questions

Which inputs does this calculation need?

Find inertia of a thin uniform rod about its midpoint. Enter mass in kg, rod length in m. The filled example is editable and is not a saved personal record.

How should I interpret the result?

Axis is perpendicular to the rod through its center. An idealized educational model using the stated SI units. Real systems may need additional forces, losses or experimental measurements. Not a safety or equipment specification.

Methodology maintained by ClarityKit. How these tools are built and checked.