Moscow is about 18 times bigger than Dayton.

Dayton is approximately 145 sq km, while Moscow (map shows its 125 districts within the pre-2012 boundary; the area includes New Moscow) is approximately 2,562 sq km, making Moscow 1,672% larger than Dayton.
Tip: This to-scale comparison of Dayton vs. Moscow 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.