Boston is about 1.4 times smaller than Irvine.

Irvine (map shows its 24 named neighbourhoods; the area covers the whole city) is approximately 170 sq km, while Boston is approximately 124 sq km, making Boston 72.97% the size of Irvine.
Tip: This to-scale comparison of Irvine vs. Boston 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.