Tehran is about 1.3 times bigger than Budapest.

Budapest is approximately 525 sq km, while Tehran is approximately 686 sq km, making Tehran 31% larger than Budapest.
Tip: This to-scale comparison of Budapest vs. Tehran 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.