Enter the column length and the particle diameter into the L/dp Ratio Calculator. The calculator will evaluate the L/dp Ratio. 

L/dp Ratio Formula

The following two example problems outline the steps and information needed to calculate the L/dp Ratio.

LDP = L / DP


  • LDP is the L/dp Ratio (length/diameter)
  • L is the column length 
  • DP is the particle diameter 

To calculate the L/dp ratio (length to diameter ratio), divide the column length by the particle diameter.

How to Calculate L/dp Ratio?

The following steps outline how to calculate the L/dp Ratio.

  1. First, determine the column length. 
  2. Next, determine the particle diameter. 
  3. Next, gather the formula from above = LDP = L / DP.
  4. Finally, calculate the L/dp Ratio.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

column length = 3

particle diameter = 5

LDP = L / DP = ?