Madrid is about 11 times bigger than Chapel Hill.

Chapel Hill is approximately 56 sq km, while Madrid is approximately 604 sq km, making Madrid 975% larger than Chapel Hill.
Tip: This to-scale comparison of Chapel Hill vs. Madrid uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.