Manchester is about 14 times smaller than Bangkok.

Bangkok is approximately 1,569 sq km, while Manchester is approximately 116 sq km, making Manchester 7.37% the size of Bangkok.
Tip: This to-scale comparison of Bangkok vs. Manchester 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.