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) 

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)