Motion Comfort  Ratio was developed by Boat Designer Ted Brewer.   The formula predicts the speed of the upward and downward motion of the boat as it encounters waves and swells.   The faster the motion the more uncomfortable the passengers.  Thus, the formula predicts the overall comfort of a boat when it is underway.  Higher values denote a more comfortable ride.  As the Displacement increases the motion comfort ratio will increase.  As the length and beam increases the motion comfort ratio will decrease. 

MCR  = Disp / (2/3*((7/10 * LWL)+(1/3 *LOA))*Beam^4/3 )

  
Reference:   Ted Brewer Yacht Design  http://www.tedbrewer.com/yachtdesign.html  

2.  Enter the Length of Boat in Feet at Waterline (LWL) in feet: 

3:  Enter the Boat's Beam in Feet:


4.  Enter Displacement (Boat's Weight) in Pounds:
 - OR-
Enter Displacement (Boat's Weight) in Long Tons:
  


( Note:  A long ton is equal to 2240 lbs )