The map above shows Alaska and Antarctica side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Alaska vs Antarctica Geography
Land area: Alaska has a land area of 571,242 square miles (1,479,509 km²), while Antarctica has 5,482,651 square miles (14,200,000 km²). Antarctica's land area is 9.6 times (860%) larger than Alaska's.
Highest point: Alaska's highest point is Denali at 20,235 feet (6,168 m); Antarctica's is Vinson Massif at 16,050 feet (4,892 m). Denali is 4,185 feet higher than Vinson Massif.
Lowest point: Alaska's lowest point is Pacific Ocean at 0 feet; Antarctica's is Denman Glacier trough (under ice) at -11,483 feet. Antarctica's lowest point is 11,483 feet lower.
Official Websites
More Size Comparisons
All Alaska size comparisons · All Antarctica size comparisons
Area, elevation and boundary figures come from official national statistics and US Census Bureau and Natural Earth boundary data; US state population, economic, county and tax figures come from the US Census Bureau, the Bureau of Economic Analysis and the Tax Foundation. Figures are rounded and for general reference.