Bangkok
1,569 km²
San Francisco
121 km²
Thailand
USA
Area Comparison
Bangkok is 13.0x larger than San Francisco
Population Comparison
Bangkok has 12.1x more people than San Francisco
In terms of area, Bangkok is 13.0x the size of San Francisco. Bangkok spans 1,569 km² (606 mi²) while San Francisco covers 121 km² (47 mi²) — a difference of 1,448 km². You could fit San Francisco inside Bangkok approximately 12 times.
To put Bangkok's size in perspective, its area of 1,569 km² is roughly the same size as London. Meanwhile, San Francisco at 121 km² is about 1.2x the size of Paris (city proper).
Picture Bangkok another way: its area is large enough to fit about 220,000 American football fields, 27 times the area of Manhattan, or 15 times the area of Paris. For San Francisco, that's about 17,000 American football fields, 60 times the area of Monaco, or 35 times the area of Central Park.
Bangkok, officially known in Thai as Krung Thep Maha Nakhon and colloquially as Krung Thep, is the capital and most populous city of Thailand. The city occupies 1,568.7 square kilometres (605.7 sq mi) in the Chao Phraya River delta in central Thailand and has an estimated population of 11.4 million people as of 2024, 15.9% of the country's population.
Known as "City of Angels", Bangkok covers 1,569 km² with a population of 10.5 million. The city was established in 1782. Bangkok is known for Grand Palace, Wat Arun, Wat Pho, among other attractions. The city's main transit system is the BTS Skytrain & MRT.
Bangkok's official Thai name is Krung Thep Maha Nakhon, with the full ceremonial name being one of the longest place names in the world.
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.
Often called "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.
Looking beyond city limits, the Bangkok metropolitan area covers 7,762 km², which is 1.1x larger than greater San Francisco at 6,984 km². The Bangkok metro area is also more populous, with 16.2 million people compared to 4.7 million.
Bangkok has a population density of 6,718 people per km² — a densely populated city. San Francisco, with 7,190 people per km², is a densely populated city. Both cities have comparable density, though San Francisco is slightly more compact.
This comparison spans continents — Bangkok in Asia versus San Francisco in North America. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Bangkok has a tropical savanna climate while San Francisco experiences Mediterranean conditions. Winters differ dramatically: Bangkok stays around 26°C while San Francisco drops to 10°C. When it's noon in Bangkok, it's midnight in San Francisco — a 15-hour time difference.
Size Ratio
San Francisco fits inside Bangkok ~12 times
Time Difference
15 hours apart
Bangkok covers 1,569 km². Cities with a similar urban footprint include London (1,572 km²), Bogotá (1,578 km²), São Paulo (1,521 km²), Johannesburg (1,644 km²), or Mexico City (1,485 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 Bangkok to San Francisco is 12,745 km (7,919 miles), with an estimated flight time of ~15h 30m.
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