London is about 6 times bigger than Sacramento.

Sacramento is approximately 253 sq km, while London (including the 32 boroughs of greater London) is approximately 1,572 sq km, making London 521% larger than Sacramento.
Tip: This to-scale comparison of Sacramento vs. London 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.