Here is a useful online drag ratio calculator to calculate the lift to drag ratio of an aircraft with ease in the fractions of seconds.
Just enter the values of lift coefficient (CL) and drag coefficient (CD), the online lift to drag ratio calculator will update you the ratio automatically.
Lift to drag ratio: Lift occurs as the result of drag. The lift to drag ratio (L/D) is the ratio that is obtained by comparing lift and drag coefficient values. It can be calculated by dividing the lift coefficient by the drag coefficient (CL/CD).
Feel free to try this online drag ratio calculator to find the CL/CD ratio in a reliable manner.