Boston is about 1.7 times smaller than Stockholm.

Stockholm (map shows its 47 named neighbourhoods; the area covers the whole city) is approximately 207 sq km, while Boston is approximately 124 sq km, making Boston 59.78% the size of Stockholm.
Tip: This to-scale comparison of Stockholm 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.