Tehran is about 3 times bigger than Bucharest.

Bucharest is approximately 226 sq km, while Tehran is approximately 686 sq km, making Tehran 204% larger than Bucharest.
Tip: This to-scale comparison of Bucharest 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.