The local chord () of an aircraft’s wing is the length of a straight line segment from the leading edge to the trailing edge of the wing at a specific point along the wing’s span. It is a critical parameter in aerodynamics and aircraft design because it determines the wing’s geometry and influences various aerodynamic characteristics.
The formula for calculating the local chord (c) at a specific point along the wing’s span is as
   
- is the local chord (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 distance from the wing’s centerline to the specific point along the wing’s span (in meters or feet).
- is the wing’s aspect ratio (dimensionless).