Wellington is about 15 times smaller than Ho Chi Minh City.

Ho Chi Minh City is approximately 6,773 sq km, while Wellington (map shows its 57 named neighbourhoods; the area covers the whole city) is approximately 444 sq km, making Wellington 6.56% the size of Ho Chi Minh City.
Tip: This to-scale comparison of Ho Chi Minh City vs. Wellington 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.