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Perch

A perch is an old unit of length that is synonymous with the rod or pole, commonly used in land measurement and surveying. It measures 16.5 feet, 5.5 yards, or approximately 5.0292 meters.

The perch was widely used in England and later in the United States for measuring plots of land, especially before the widespread adoption of the metric system. It was also used to describe area when squared (square perch).

Key points:

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  1 perch = 16.5 feet

  
  
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  1 perch = 5.5 yards

  
  
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  1 perch ≈ 5.0292 meters

  
  
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  4 perches = 1 chain

  
  
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  40 perches = 1 furlong

  
  

While largely obsolete today, the term perch still appears in historical land deeds, legal documents, and some traditional surveying contexts.

Fingerbreadth

A fingerbreadth is a traditional unit of length based on the width of a human finger, often used in historical and informal measurements. It typically measures about ¾ inch (approximately 19 millimeters), though it can vary depending on the person and context.

Fingerbreadths were commonly used in tailoring, medicine, and everyday life to estimate small lengths before standardized units became widespread.

Key points:

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  Approximately ¾ inch (19 mm)

  
  
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  Based on the width of a finger

  
  
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  Used in historical measurements and everyday approximations

  
  
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  Part of body-based units like handbreadth and span

  
  

Fingerbreadth remains a handy reference for rough estimates even today.