Enter the patio vertical drop  and the patio width into the Patio Fall Ratio Calculator. The calculator will evaluate and display the Patio Fall Ratio. 

Patio Fall Ratio Formula

The following formula is used to calculate the Patio Fall Ratio. 

PATR = D / W

  • Where PATR is the Patio Fall Ratio
  • D is the patio vertical drop  
  • W is the patio width 

How to Calculate Patio Fall Ratio?

The following example problems outline how to calculate Patio Fall Ratio.

Example Problem #1:

  1. First, determine the patio vertical drop . 
    • The patio vertical drop  is given as: 5.
  2. Next, determine the patio width. 
    • The patio width is provided as: 150.
  3. Finally, calculate the Patio Fall Ratio using the equation above: 

PATR = D / W

The values given above are inserted into the equation below and the solution is calculated:

PATR = 5 / 150 = .033 = 3.33%


Example Problem #2: 

For this problem, the variables required are provided below:

patio vertical drop  = 6

patio width = 200

Test your knowledge using the equation and check your answer with the calculator above.

PATR = D / W = ?