Enter the angular moment and the angular velocity into the calculator to determine the rotational inertia.

## Rotational Inertia Formula

The following formula is used to calculate a rotational inertia.

I = L / w

• Where I is the rotational inertia (kg*m^2)
• L is the angular momentum (kg*m^2*s^-1)
• w is the angular velocity (rad/s)

## Rotational Inertia Definition

Rotational inertia is defined as the total resistance to rotational movement about a radius.

## Rotational Inertia Example

How to calculate rotational inertia.

1. First, determine the angular moment.

For this example, we will say the rotating object has an angular moment of 20 (kg*m^2*s^-1).

2. Next, determine the angular velocity.

For this example, the angular velocity will be 25 rad/s.

3. Finally, calculate the angular inertia.

Using the formula we find the inertia to be 20/25 = .80.

## FAQ

What is rotational inertia?

Rotational inertia is the resistance of an object to rotate about an object.