Pittsburgh is about 1.5 times smaller than Seattle.

Seattle is approximately 217 sq km, while Pittsburgh is approximately 143 sq km, making Pittsburgh 66.0% the size of Seattle.
Tip: This to-scale comparison of Seattle vs. Pittsburgh 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.