Length

What is a Inch? (in)

Definition

An inch (symbol: in or ″) is a unit of length in the imperial and US customary systems, equal to exactly 2.54 centimeters or 1/12 of a foot. It is commonly used in the United States and United Kingdom for screen sizes, clothing measurements, and everyday small-scale dimensions.

Common Uses

  • › Screen and monitor sizes (diagonal)
  • › Clothing and waist measurements
  • › Paper and print dimensions
  • › Pipe and hardware sizing

Converters

Inches to Centimeters → Inches to Feet →

Key Facts

  • Symbol
    in
  • Category
    Length
  • 1 in = 2.54 cm
  • 1 in = 25.4 mm
  • 12 in = 1 ft
  • 1 in ≈ 0.0833 ft

Related Terms

About the Inch

An inch (symbol: in or ″) is a unit of length in the imperial and US customary systems, equal to exactly 2.54 centimeters or 1/12 of a foot. It is commonly used in the United States and United Kingdom for screen sizes, clothing measurements, and everyday small-scale dimensions.

Equivalents and conversions

  • 1 in = 2.54 cm
  • 1 in = 25.4 mm
  • 12 in = 1 ft
  • 1 in ≈ 0.0833 ft

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