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Conversion Formula:
Convert Square Inch to Barn (in² to b) 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.
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
Barn (b) - nuclear/particle cross-section area
Barn is a non-SI unit of area used in nuclear and particle physics to express interaction cross-sections. The name originated humorously during the Manhattan Project (“as big as a barn”).
- Symbol: b
- System: Non-SI (accepted in high-energy/nuclear physics)
- Exact relations: 1 b = 10⁻²⁸ m² = 10⁻²⁴ cm² = 100 fm²
- Common submultiples: 1 mb = 10⁻³ b; 1 µb = 10⁻⁶ b; 1 nb = 10⁻⁹ b; 1 pb = 10⁻¹² b; 1 fb = 10⁻¹⁵ b; 1 ab = 10⁻¹⁸ b
- Related usage: integrated luminosity often quoted in inverse barns (e.g., fb⁻¹)
- Typical examples: neutron capture and scattering cross-sections; collider process cross-sections reported from barns down to picobarns and femtobarns