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California vs UK Size: How Much Bigger Is California?

By Marko Visic·Published 15 May 2026·Sources: US Census 2020, CIA World Factbook·CC-BY 4.0

California covers 163,696 sq mi (423,970 km²). The UK covers 94,058 sq mi (243,610 km²). California is 1.74× larger — almost two UKs fit inside California. But the UK has 1.74× California's population — a perfect inverse. And California's economy, if counted as a country, would rank among the world's top ten — roughly 8% ahead of the UK by nominal GDP.

Diagram showing the UK overlaid inside California at true equal-area scale. California 163,696 sq mi; UK 94,058 sq mi; ratio 1.74×.California is 1.74× the size of the UKCalifornia 163,696 sq mi · UK 94,058 sq miCALIFORNIAUKsimplemaplab.com/size-comparisons/california-vs-uk · CC-BY 4.0
UK overlaid inside California at true equal-area scale. The UK covers ~57% of California's footprint; the leftover California area (about 70,000 sq mi) is the size of West Virginia + Maryland combined.
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At a glance: California vs UK by the numbers

MetricCaliforniaUKRatio
Total area (sq mi)163,69694,0581.74× CA
Population (2024)39,500,00068,700,0001.74× UK
Density (/sq mi)2547362.90× UK
GDP (2024)$3.9T$3.6T1.08× CA
Coastline (mi)8407,7239.19× UK
Highest point (ft)14,505 (Whitney)4,413 (Ben Nevis)3.29× CA
World rank (area)3rd US state80th country—

How much bigger is California than the UK?

California is 1.74× larger than the UK by total area — a difference of about 69,638 sq mi. That extra area, on its own, would rank as the world's 80th largest country — bigger than Bangladesh (~57,300 sq mi), Greece (~50,950 sq mi), or Iceland (~39,770 sq mi).

The perfect symmetry: California is 1.74× the UK's area, and the UK has 1.74× California's population. So the UK is exactly 3.03× denser (counting both ratios). California's density (254/sq mi) is dominated by the coastal metropolitan strip (LA, San Francisco, San Diego); inland California has vast empty mountain and desert areas. The UK has no equivalent empty zone — even the Scottish Highlands aren't truly uninhabited.

The economic gap: California roughly 8% larger than the UK

California, if counted as a country, would rank among the world's top-ten largest economies by nominal GDP. Only a handful of national economies (Germany, Japan, China, USA, and at times India) are clearly larger. California, a single US state, exceeds the UK by roughly 8% on nominal GDP.

Per-capita, California is much wealthier in nominal terms: ~$99,000 per resident vs ~$52,000 in the UK. The gap reflects US-UK wage differences and California's concentration of high-margin industries: tech (Silicon Valley), entertainment (Hollywood), agriculture (Central Valley), and energy (Long Beach refineries).

Drawn to scale: California next to the UK

Both regions rendered at the same area-per-pixel scale, side by side.

Side-by-side equal-area: California (163,696 sq mi) next to UK (94,058 sq mi).California is 1.74× the area of the UKCalifornia163,696 sq miUnited Kingdom94,058 sq mi
California rendered with standard US Albers (parallels 29.5°N + 45.5°N); UK with parallels 50/58°N. Both equal-area-preserving.

What else is the size of California?

What else is the size of the UK?

Why this comparison matters

California vs the UK is the rare comparison where a sub-national US state outweighs a G7 country on the economy and equals it culturally. People search the comparison because both are exporters of soft power on a global scale — Hollywood and Silicon Valley on one side, the BBC, the Premier League, and the City of London on the other. Setting them side by side reshapes the mental map: the UK is not a country-of-the-mind floating somewhere larger than its real footprint, and California is not a coastal strip lost inside the contiguous USA. The UK is the size of Oregon; California is the size of Sweden plus the Netherlands.

The comparison also frames a key economic milestone: California passed the UK in nominal GDP in 2017 and has held a wider margin every year since. If California were a sovereign country it would be a permanent member of the G7.

Geography and climate

California stretches 770 mi (1,240 km) from the Oregon border (42°N) to the Mexican border at Tijuana (32.5°N), spanning about 10 degrees of latitude. The state contains every major climate zone except polar: Mediterranean on the coast, alpine in the Sierra Nevada (Mt. Whitney at 14,505 ft is the highest point in the contiguous USA), high desert in the Mojave, low desert in Death Valley (282 ft below sea level, the lowest point in North America), and temperate rainforest in the redwoods of the North Coast. Mean elevation: about 2,900 ft. California has 840 mi of Pacific coastline and contains 9 of the 10 highest peaks in the lower 48.

The UK spans only about 600 mi (970 km) north-to-south and 11 degrees of latitude. Climate is uniformly temperate maritime — Gulf Stream-moderated, cloud-heavy, with rainfall spread evenly across the calendar (London averages 23 in/yr; Cardiff 45 in/yr). Mean elevation is about 528 ft. Ben Nevis at 4,413 ft would not crack California's top 200 peaks. The UK has no deserts, no rainforests, and no peaks above the treeline anywhere.

Population and density

The UK's 68.7 million residents (Office for National Statistics mid-2024 estimate) make it the world's 21st-most populous country. England holds about 84% of the UK population (57.7M); London alone (9.7M) holds 14%. Density inside England reaches 1,150/sq mi, while Scotland (174/sq mi) and the Highlands are sparser. About 84% of UK residents live in urban areas.

California's 39.5 million residents (US Census 2024 vintage) make it the most populous US state — though California lost residents in 2020 and 2021 for the first time in state history. Greater Los Angeles holds 18.7 million, the San Francisco Bay Area 7.7 million, and the San Diego metro 3.3 million. Together the three southern coastal metros plus the Bay Area hold about 73% of Californians on roughly 15% of the land. The Central Valley produces about 25% of the US food supply; the Mojave, Inland Empire deserts, and northeastern counties (Modoc, Lassen, Plumas) hold densities below 10/sq mi.

The economy and what people do

California's $3.9 trillion economy (US BEA, 2024) would rank among the world's top-ten economies as a country. The state is concentrated in four economic engines: Silicon Valley (Apple, Google, Meta, Nvidia, OpenAI), Hollywood and the entertainment cluster, the Central Valley agricultural belt (the world's largest dairy producer), and the Long Beach–Los Angeles port complex (the busiest container port in the Western Hemisphere). Currency: US dollar.

The UK's $3.59 trillion economy (IMF 2024) is led by services (about 79% of GDP) anchored in London, the world's second-largest financial center after New York. Other sectors: pharmaceuticals (GSK, AstraZeneca), aerospace (Rolls-Royce, BAE Systems), creative industries, and higher education (Oxford, Cambridge, Imperial). Currency: pound sterling.

10 surprising facts about California vs the UK

  1. California is 1.74× the UK. Almost two UKs fit inside California.
  2. The UK has 1.74× California's population. Perfect inverse of area ratio.
  3. California's economy is roughly 8% larger than the UK's by nominal GDP. Both rank among the world's top-ten largest economies.
  4. The UK is 2.90× denser than California. 736 vs 254 people per sq mi.
  5. UK coastline is 9.2× California's. 7,723 mi vs 840 mi — UK is an island; California is one long Pacific edge.
  6. California's highest peak (Mt. Whitney 14,505 ft) is 3.3× Ben Nevis (4,413 ft).
  7. 10 US states are individually bigger than the UK. California is one of them; see also UK vs USA.
  8. California has more biological diversity than any other US state. Mediterranean, desert, alpine, and rainforest climates within state lines.
  9. California is bigger than every European country except Russia and Ukraine.
  10. California + UK populations would total 108 million. Bigger than Egypt, just under Vietnam.

Methodology and sources

Area: US Census 2020 (California) + CIA World Factbook (UK).

Population: US Census (CA), UK Office for National Statistics (UK).

Projections: California with standard US Albers (rotate 96°, parallels 29.5/45.5°N); UK with parallels 50/58°N. Both equal-area-preserving. Last updated 26 June 2026.

Frequently asked questions

Yes. California covers 163,696 sq mi (423,970 km²); the UK covers 94,058 sq mi (243,610 km²). California is 1.74 times larger by total area — bigger than the entire United Kingdom by about 70,000 sq mi (the size of West Virginia + Maryland combined).
California is 1.74× larger — a difference of about 69,638 sq mi. The two are NOT close: California's "extra" area (beyond UK size) alone is bigger than the state of Florida, or about the size of Cambodia.
California has the larger economy — roughly 8% larger than the UK by nominal GDP. As a standalone economy California would rank among the world's top-ten largest, narrowly ahead of the UK. Per capita, California is roughly twice the UK on a nominal basis.
The UK has more people: approximately 68.7 million vs California's 39.5 million. The UK has 1.74× California's population — a perfect inverse of the area ratio. As a result, the UK is 2.90× denser (736 per sq mi vs California's 254).
No — California was Spanish (1769–1821), then Mexican (1821–1848), then a US territory and state (from 1850, the 31st state). The UK never controlled California, though British and US tensions over the Pacific Northwest (Oregon Country) were resolved by the 1846 Oregon Treaty. The closest UK-California connection is the Pacific Northwest border settlement.
Ten US states are individually larger than the UK: Alaska (6.07×), Texas (2.78×), California (1.74× — this article), Montana, New Mexico, Arizona, Nevada, Colorado, Oregon, and Wyoming. The remaining 40 states + DC are individually smaller than the UK.
California (163,696 sq mi) is bigger than every European country except Russia and Ukraine. It is approximately equal to Sweden (173,860 sq mi × 0.94), Finland (130,558 × 1.25), Norway (148,729 × 1.10), or Italy + Belgium combined. Two Californias = roughly Spain + France combined.
The UK (94,058 sq mi) is approximately the size of Oregon (98%), Romania (102%), Ghana (102%), or Guinea (99%). UK + Ireland combined is still smaller than California.
The UK has dramatically more coastline: 7,723 mi vs California's 840 mi — UK is 9.2× California by coast. As an island nation, the UK has coast in every direction. California's coast is one long Pacific edge (Oregon to Mexico, about 840 mi).
California spans Mediterranean (coastal), high desert (Mojave), alpine (Sierra Nevada), and rainforest (north coast) — extreme climate variety. The UK is uniformly temperate maritime — mild winters, cool summers, frequent rain. The UK's latitude (50–60°N) is matched in the US by southern Alaska — but the Gulf Stream keeps the UK far warmer.

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Suggested citation: SimpleMapLab (2026). California vs UK Size. Retrieved from https://www.simplemaplab.com/size-comparisons/california-vs-uk. CC-BY 4.0.