City size comparison

compared to

Sydney is about 4.5 times smaller than San Francisco.

San Francisco (including the city proper only) is approximately 121 sq km, while Sydney is approximately 27 sq km, making Sydney 22.07% the size of San Francisco.
Tip: This to-scale comparison of San Francisco vs. Sydney uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Sydney vs. San Francisco

Flip Comparison · See true size
See Sydney on top of San Francisco
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Cost of Living Comparison · 7 categories - 2026 data
San Francisco is 38.1% more expensive than Sydney
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