Jakarta is about 4.2 times smaller than Ottawa.

Ottawa is approximately 2,779 sq km, while Jakarta is approximately 662 sq km, making Jakarta 23.82% the size of Ottawa.
Tip: This to-scale comparison of Ottawa vs. Jakarta 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.