City size comparison

compared to

Oslo is about 3.8 times bigger than San Francisco.

San Francisco (including the city proper only) is approximately 121 sq km, while Oslo is approximately 454 sq km, making Oslo 275% larger than San Francisco.
Tip: This to-scale comparison of San Francisco vs. Oslo uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Oslo vs. San Francisco

Flip Comparison · See true size
See Oslo on top of San Francisco
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Cost of Living Comparison · 7 categories - 2026 data
San Francisco is 2.1 times more expensive than Oslo
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