Prague is about 3.2 times bigger than Richmond.

Richmond is approximately 155 sq km, while Prague is approximately 496 sq km, making Prague 220% larger than Richmond.
Tip: This to-scale comparison of Richmond vs. Prague 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.