Istanbul is about 6 times bigger than Kyoto.

Kyoto is approximately 828 sq km, while Istanbul is approximately 5,343 sq km, making Istanbul 545% larger than Kyoto.
Tip: This to-scale comparison of Kyoto vs. Istanbul 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.