Digit (digit) - Unit Information & Conversion
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What is a Digit?
Definition
The Digit, also known as the finger or fingerbreadth, is an ancient, anthropomorphic unit of length, originally based on the breadth (width) of a human adult finger (typically the index finger). As a body-based unit, its value varied significantly depending on the person, time period, and culture.
Historically, it was often considered to be approximately 3/4 of an inch or about 1.9 centimeters (cm). In many systems, it formed a subdivision of larger units like the palm, span, or cubit. For example, it was common for:
- 4 digits = 1 palm
- 12 digits = 1 span (sometimes)
- 24 or 28 digits = 1 cubit (depending on the cubit definition)
History
The digit is one of the oldest known units of measurement, used by ancient civilizations including the Egyptians, Mesopotamians, Greeks, Romans, and later across Europe. Its convenience stemmed from the ready availability of the human hand for estimation.
- Ancient Egypt: The digit (djeba) was a fundamental unit, with 28 digits forming the Royal Cubit.
- Ancient Rome: The Roman digit (digitus) was defined as 1/16 of a Roman foot, approximately 1.85 cm. Four digiti made a palmus (palm).
- Medieval England: The digit was often reckoned as 3/4 of an inch, derived from the barleycorn (3 barleycorns = 1 inch, 4 digits = 3 inches).
Due to its inherent variability and the rise of more standardized systems based on physical prototypes (like the yard or meter), the digit gradually fell out of practical use for trade and science, becoming largely obsolete by the early modern period.
Common Uses
The digit is now obsolete for practical measurement but is encountered in:
- Historical Texts: Found in ancient and medieval documents describing dimensions of objects, buildings, or anatomical measurements.
- Archaeology & Anthropology: Used when interpreting historical measurements or comparing ancient systems.
- Figurative Language: Occasionally used informally to mean a very small distance ("just a digit more").
- Understanding Historical Units: Key to understanding the structure of ancient measurement systems (e.g., relationship to palm, cubit).
Digit Conversion Formulas
To Meter:
To Kilometer:
To Hectometer:
To Decimeter:
To Centimeter:
To Millimeter:
To Inch:
To Foot:
To Yard:
To Mile:
To Nautical Mile:
To Micrometer:
To Nanometer:
To Light Year:
To Astronomical Unit:
To Parsec:
To Angstrom:
To Point (Typography):
To Mil/Thou:
To Fathom:
To Furlong:
To Link (Gunter's):
To Pace:
To Span:
To Cable Length:
To Ell:
To Finger:
To Roman Mile:
To Stadion:
To Chi (Chinese):
To Shaku (Japanese):
To Li (Chinese):
To Toise:
To Bolt:
To Rope:
To Smoot:
To Sajene:
To Ken:
To Wa:
To Vara:
To Aln:
To Cubit (Royal/Egyptian):
To Versta:
To Arpent:
To Ri (Japanese):
To Klafter:
To Yojana:
To Skein:
Frequently Asked Questions
There is no single, precise value for the digit because it was based on human anatomy and varied by system. Common historical approximations include:
- Approximately 0.75 inches (in)
- Approximately 1.85 to 1.9 centimeters (cm)
- Often defined as 1/4 of a palm or 1/16 of a foot within specific historical systems.
Convert Digit
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