What is the altitude change represented on sectional charts for every increment?

On sectional charts, the altitude change represented for every increment is 1,000 feet. This is a standard visual aid for pilots and air traffic controllers that allows for easy interpretation of the vertical separation between different flight levels. Each contour or altitude representation on a sectional chart typically shows a 1,000-foot increment, which helps in understanding the airspace structure, including terrain elevations, and provides guidance for maintaining safe altitudes, especially in areas with significant terrain variations. This consistency is crucial for both navigation and safety in flight operations.