City size comparison

compared to

Sydney is about 32 times smaller than San Diego.

San Diego is approximately 844 sq km, while Sydney is approximately 27 sq km, making Sydney 3.16% the size of San Diego.
Tip: This to-scale comparison of San Diego vs. Sydney uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Sydney vs. San Diego
Flip Comparison · See true size
See Sydney on top of San Diego
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Cost of Living Comparison · 7 categories - 2026 data
San Diego is 17.4% more expensive than Sydney
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