Red Deer is about 1.2 times smaller than San Francisco.

San Francisco (including the city proper only) is approximately 121 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 86.55% the size of San Francisco.
Tip: This to-scale comparison of San Francisco 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.