Oswald Efficiency Factor Calculator

The Oswald Efficiency Factor ($e$) is a dimensionless parameter used in aerodynamics to characterize the efficiency of an aircraft’s wing in generating lift

• $e$ is the Oswald Efficiency Factor.
• $\pi$ is the mathematical constant pi (approximately 3.14159).
• $A$ is the aspect ratio of the wing.
• $\text{AR}$ is the aspect ratio, defined as the square of the wingspan ($b$) divided by the wing area ($S$).