Pittsburgh is about 1.2 times bigger than Dublin.

Dublin is approximately 118 sq km, while Pittsburgh is approximately 143 sq km, making Pittsburgh 22% larger than Dublin.
Tip: This to-scale comparison of Dublin 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.