Red Deer is about 1.2 times smaller than Boston.

Boston is approximately 124 sq km, while Red Deer (map shows its 83 named neighbourhoods; the area covers the whole city) is approximately 105 sq km, making Red Deer 84.46% the size of Boston.
Tip: This to-scale comparison of Boston vs. Red Deer 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.