Budapest is about 1.3 times smaller than Tehran.

Tehran is approximately 686 sq km, while Budapest is approximately 525 sq km, making Budapest 76.55% the size of Tehran.
Tip: This to-scale comparison of Tehran vs. Budapest 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.