Dayton is about 4.3 times smaller than Tokyo.

Tokyo is approximately 619 sq km, while Dayton is approximately 145 sq km, making Dayton 23.35% the size of Tokyo.
Tip: This to-scale comparison of Tokyo vs. Dayton 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.