Enter the mass (kg), the radius (m), and the angular acceleration (rad/s^2) into the Rotational Weight Calculator. The calculator will evaluate the Rotational Weight. 

Rotational Weight Formula

The following formula is used to calculate the Rotational Weight. 

RW = m*r*a


  • RW is the Rotational Weight (N)
  • m is the mass (kg) 
  • r is the radius (m) 
  • a is the angular acceleration (rad/s^2) 

To calculate the rotational weight, multiply the mass, radius, and angular acceleration together.

How to Calculate Rotational Weight?

The following two example problems outline the steps and information needed to calculate the Rotational Weight.

Example Problem #1

  1. First, determine the mass (kg).
    • The mass (kg) is calculated to be : 3.
  2. Next, determine the radius (m).
    • The radius (m) is measured to be: 4.
  3. Next, determine the angular acceleration (rad/s^2).
    • The angular acceleration (rad/s^2) is found to be: 5.
  4. Finally, calculate the Rotational Weight using the formula above: 

RW = m*r*a

The values provided above are inserted into the equation below and computed.

RW = 3*4*5 = 60.00 (N)

Example Problem #2

The variables required for this problem are provided below:

mass (kg) = 6

radius (m) = 7

angular acceleration (rad/s^2) = 9

Test your knowledge and check your answer with the calculator.

RW = m*r*a = (N)