Convert Square Foot to Square Inch

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Conversion Formula:

in² = ft² × 143.999938

Convert Square Foot to Square Inch (ft² to in²) instantly with accurate, readable results.

Convert between square meters, acres, square feet, hectares, and other common units with our Area Unit Converter. This intuitive unit conversion tool helps you calculate land size, floor space, and surface area across both metric and imperial systems. Whether you're working on real estate, construction, or geography tasks, our area unit conversion calculator ensures precise and instant results.

From unit

Square foot (ft²) - Imperial/US area unit

Square foot is an Imperial/US customary unit of area equal to a square 1 foot on a side. Used for floor space, building plans, and real estate listings.

  • Symbol: ft²
  • System: Imperial/US customary
  • Exact relations: 1 ft² = (0.3048 m)² = 0.09290304 m² (exact) = 144 in²
  • Other relations: 1 yd² = 9 ft²; 1 m² ≈ 10.7639104 ft²
  • Typical examples: room and apartment areas, carpet/laminate coverage, HVAC load calculations
To unit

Square inch (in²) - Imperial/US area unit

Square inch is an Imperial/US customary unit of area equal to a square 1 inch on a side. Used for small surface areas in manufacturing, displays, and hardware specs.

  • Symbol: in²
  • System: Imperial/US customary
  • Exact relations: 1 in² = (2.54 cm)² = 6.4516 cm² = 0.00064516 m² = 645.16 mm²
  • Other relations: 1 in² = 1/144 ft² ≈ 0.006944444 ft² ≈ 0.000771605 yd²
  • Typical examples: screen area, gasket/washer footprints, cross-sectional areas in inch–pound drawings