Tehran is about 13 times bigger than Bern.

Bern is approximately 52 sq km, while Tehran is approximately 686 sq km, making Tehran 1,229% larger than Bern.
Tip: This to-scale comparison of Bern 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.