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USA
Australia
Area Comparison
San Francisco is 102.2x smaller than Sydney
Population Comparison
San Francisco has 6.1x fewer people than Sydney
In terms of area, Sydney is 102.2x the size of San Francisco. Sydney spans 12,368 km² (4,775 mi²) while San Francisco covers 121 km² (47 mi²) — a difference of 12,247 km². You could fit San Francisco inside Sydney approximately 102 times.
To put San Francisco's size in perspective, its area of 121 km² is about 1.2x the size of Paris (city proper). Meanwhile, Sydney at 12,368 km² is about 2.0x the size of Shanghai.
A cultural and financial center in Northern California. Known as "SF", San Francisco covers 121 km² with a population of 0.9 million. The city was established in 1776. San Francisco is known for Golden Gate Bridge, Alcatraz Island, Cable cars, among other attractions. The city's main transit system is the BART & Muni.
San Francisco's 121 km² makes it one of the smallest major US cities by area
Australia's largest city, known for the Opera House. Also known as "The Harbour City", Sydney has an area of 12,368 km² and is home to 5.3 million people. Its history stretches back to 1788. Visitors come for Sydney Opera House, Harbour Bridge, Bondi Beach, and much more. Getting around is easy with the Sydney Trains.
Sydney's administrative area is so large it stretches from the coast to the Blue Mountains foothills
Looking beyond city limits, the Sydney metropolitan area covers 12,368 km², which is 1.8x larger than greater San Francisco at 6,984 km². The Sydney metro area is also more populous, with 5.3 million people compared to 4.7 million.
San Francisco has a population density of 7,190 people per km² — a densely populated city. Sydney, with 429 people per km², is a low-density, sprawling urban area. San Francisco is dramatically more crowded, with 16.8x the population density.
This comparison spans continents — San Francisco in North America versus Sydney in Oceania. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
San Francisco has a Mediterranean climate while Sydney experiences humid subtropical conditions. When it's noon in Sydney, it's midnight in San Francisco — a 18-hour time difference.
Size Ratio
San Francisco fits inside Sydney ~102 times
Density Gap
San Francisco is 16.8x more densely populated
Time Difference
18 hours apart
The straight-line distance from San Francisco to Sydney is 11,948 km (7,424 miles), with an estimated flight time of ~14h 33m. See full distance details, including timezone difference and city facts.
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