London is about 5 times bigger than Tampa.

Tampa is approximately 297 sq km, while London (including the 32 boroughs of greater London) is approximately 1,572 sq km, making London 430% larger than Tampa.
Tip: This to-scale comparison of Tampa 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.