Perth
6,417 km²
San Francisco
121 km²
Australia
USA
Area Comparison
Perth is 53.0x larger than San Francisco
Population Comparison
Perth has 2.5x more people than San Francisco
Yes — Perth is 53.0x larger than San Francisco by area. Perth spans 6,417 km² (2,478 mi²) while San Francisco covers 121 km² (47 mi²) — a difference of 6,296 km². You could fit San Francisco inside Perth approximately 53 times.
To put Perth's size in perspective, its area of 6,417 km² is roughly the same size as Shanghai. Meanwhile, San Francisco at 121 km² is about 1.2x the size of Paris (city proper).
In more relatable units, Perth's 6,417 km² is about 899,000 American football fields, 110 times the area of Manhattan, or 61 times the area of Paris. San Francisco works out to about 17,000 American football fields, 60 times the area of Monaco, or 35 times the area of Central Park.
Perth is the capital city of Western Australia. It is the fourth-most-populous city in Australia, with a population of over 2.3 million within Greater Perth as of 2023. The world's most isolated major city by certain criteria, Perth is part of the South West Land Division of Western Australia, with most of Perth's metropolitan area on the Swan Coastal Plain between the Indian Ocean and the Darling Scarp.
Known as "City of Light", Perth covers 6,417 km² with a population of 2.1 million. The city was established in 1829. Perth is known for Swan River, Kings Park, Cottesloe Beach, among other attractions.
Perth is considered the world's most isolated major city by certain criteria, sitting on Australia's west coast.
San Francisco, officially the City and County of San Francisco, is the fourth-most populous city in California and the 17th-most populous in the United States, with a population of 826,079 in 2025. Among U.S. cities with a population of 300,000 or more, San Francisco is ranked first by per capita income, second by population density, and sixth by aggregate income as of 2023.
Nicknamed "The City by the Bay", San Francisco has an area of 121 km² and is home to 0.9 million people. Its history stretches back to 1776. Visitors come for Golden Gate Bridge, Alcatraz Island, Cable cars, and much more. Getting around is easy with the BART & Muni.
San Francisco ranks first by per capita income among all US cities with 300,000+ residents as of 2023.
Perth has a population density of 333 people per km² — a low-density, sprawling urban area. San Francisco, with 7,190 people per km², is a densely populated city. San Francisco is dramatically more crowded, with 21.6x the population density.
Size Ratio
San Francisco fits inside Perth ~53 times
Density Gap
San Francisco is 21.6x more densely populated
Perth covers 6,417 km². Cities with a similar urban footprint include Shanghai (6,341 km²), Guangzhou (7,434 km²), Istanbul (5,461 km²), Wuhan (8,569 km²), or Melbourne (9,993 km²).
San Francisco covers 121 km². Cities with a similar urban footprint include Vancouver (115 km²), Paris (105 km²), Miami (143 km²), Barcelona (101 km²), or Lisbon (100 km²).
The straight-line distance from Perth to San Francisco is 14,744 km (9,161 miles), with an estimated flight time of ~17h 51m.
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