The root chord of an exposed wing, often denoted as , is the chord length of the wing at its innermost section, typically where the wing attaches to the fuselage. It is one of the key geometric parameters of the wing and plays a crucial role in determining the aircraft’s aerodynamic characteristics.
The formula for calculating the root chord () is straightforward
 
- is the root chord of the wing (typically in meters or feet).
- � is the wing’s reference area (in square meters or square feet).
- � is the wingspan (in meters or feet).
- �� is the wing’s aspect ratio (dimensionless).