Square Inch to Square Kilometer Conversion Result

Square Inch: (in2) is a unit of area in the Imperial and US customary systems, commonly used to measure small surfaces, such as screens, labels, and mechanical parts. It is widely used in the United States, Canada, and the UK for various applications.

1 square inch (in2) = the area of a square with sides measuring 1 inch (1 in × 1 in).

Interesting Facts:
  • Used to measure display screen resolution (pixels per square inch, PPI) with modern's phones PPI ranging from 390 to 500
  • A standard business card is about 4 in2
  • A US dollar bill is about 16 in2
  • A playing card has an area of about 8.75 in2


Square Kilometer: (km2) is a metric unit of area measurement commonly used to measure large land areas, such as cities, countries, forests, and lakes. It is part of the International System of Units (SI) and is widely used worldwide.

1 square kilometer (km2) = the area of a square with sides measuring 1 kilometer (1 km × 1 km).

Interesting Facts:
  • New York City covers about 1,200 km2
  • Paris has an area of about 105 km2
  • Yellowstone National Park (USA) covers 8,983 km2
  • Lake Superior on the border between Canada and the United States, the world's second largest lake, is 82,000 km2
Related conversions