Tempe is about 15 times smaller than London.

London (including the 32 boroughs of greater London) is approximately 1,572 sq km, while Tempe (map shows its 64 named neighbourhoods; the area covers the whole city) is approximately 104 sq km, making Tempe 6.59% the size of London.
Tip: This to-scale comparison of London vs. Tempe 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.