Enter the total lift force (N) and the total drag force (N) into the Lift to Drag Ratio Calculator. The calculator will evaluate and display the Lift to Drag Ratio. 

Lift to Drag Ratio Formula

The following formula is used to calculate the Lift to Drag Ratio. 

LDR = L / D

  • Where LDR is the Lift to Drag Ratio
  • L is the total lift force (N) 
  • D is the total drag force (N) 

How to Calculate Lift to Drag Ratio?

The following example problems outline how to calculate Lift to Drag Ratio.

Example Problem #1:

  1. First, determine the total lift force (N). 
    • The total lift force (N) is given as: 150.
  2. Next, determine the total drag force (N). 
    • The total drag force (N) is provided as: 200.
  3. Finally, calculate the Lift to Drag Ratio using the equation above: 

LDR = L / D

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

LDR = 150 / 200 = .75

Example Problem #2: 

For this problem, the variables required are provided below:

total lift force (N) = 200

total drag force (N) = 30

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

LDR = L / D = ?