San Francisco is 22% larger than Carlsbad, California.
Area: 100 km2 calculated
Carlsbad is an affluent seaside resort city occupying a 7-mile stretch of Pacific coastline in North San Diego County, California. The city is located 87 miles south of Los Angeles and 35 miles north of downtown San Diego. Wikipedia
Area: 122 km2 calculated
San Francisco, officially the City and County of San Francisco, is the cultural center and a leading financial hub of the San Francisco Bay Area and Northern California. Wikipedia