terican

BIPM-ratified constants · v1.0

Converter

Link, to meter converter calculator.

Convert surveyor's links (Gunter's chain links) to meters and back using the exact formula m = L x 0.201168.

From

links

link_to_meter

1 link_to_meter =0.201168Converted Length

Equivalents

Precision: 6 dp · Notation: Decimal · 2 units

→ Meters

Linkslink_to_meter0.201168

→ Links

Metersmeter_to_link4.971

Common pairings

1 link_to_meterequals4.971 meter_to_link
1 meter_to_linkequals0.201168 link_to_meter

The conversion

How the value
is computed.

Link to Meter Conversion: Formula, History, and Applications

The link to meter converter transforms measurements expressed in surveyor's links — also known as Gunter's chain links — into meters, or converts meters back into links. This unit conversion is essential for land surveyors, title examiners, real estate professionals, and historians working with historical land records in the United States, United Kingdom, Australia, and Canada.

The Conversion Formula

The fundamental formula for converting links to meters is:

m = L × 0.201168

Where m is the length in meters and L is the number of surveyor's links. To convert in the opposite direction — from meters to links — apply the inverse formula:

L = m ÷ 0.201168

The constant 0.201168 derives directly from the physical definition of Gunter's chain. One chain equals exactly 66 feet (20.1168 meters) and contains exactly 100 links. Therefore, one link equals 66 ÷ 100 = 0.66 feet = 7.92 inches = 0.201168 meters. According to NIST Unit Conversion guidelines, this relationship is fixed and exact within the imperial-to-metric framework.

Variable Definitions

  • Value (L or m): The numeric length value to convert. Enter any positive number representing a distance in either links or meters.
  • Direction: Select 'Links to Meters' to apply m = L × 0.201168, or 'Meters to Links' to apply L = m ÷ 0.201168.

Historical Background: Gunter's Chain

Edmund Gunter, an English mathematician and astronomer, introduced the surveyor's chain in 1620. His design consisted of 100 iron links joined by oval rings, totaling exactly 66 feet in length. The 66-foot dimension was deliberately chosen because 10 chains equal one furlong, 80 chains equal one mile, and 10 square chains equal exactly one acre — making large area calculations straightforward without mechanical aids. According to NIST Special Publication 811: Guide for the Use of the International System of Units, these historical units persist in legal land descriptions and cadastral surveys worldwide and retain legal standing in property law across multiple jurisdictions. The elegance of Gunter's design made it the dominant surveying instrument for over 300 years across the English-speaking world.

Practical Conversion Examples

The following examples demonstrate real-world applications of the link-to-meter formula:

  • Property boundary: A historical deed describes a boundary line as 250 links. Calculation: 250 × 0.201168 = 50.292 meters.
  • Agricultural plot: A field boundary of 1,000 links (10 chains) equals 1,000 × 0.201168 = 201.168 meters, confirming the standard furlong measurement.
  • Reverse conversion: A surveyor measures a fence at 75 meters and needs the equivalent in links for a historical document: 75 ÷ 0.201168 = 372.83 links.
  • Small easement: A road easement of 10 links calculates to 10 × 0.201168 = 2.01168 meters, approximately 2 meters wide.

Modern Applications in GIS and Digital Mapping

Contemporary land management requires reconciling historical survey data with modern digital mapping systems. GIS professionals, surveyors, and cartographers routinely convert link-based measurements from historical documents into meters to integrate legacy cadastral data with current GPS-derived coordinates and satellite imagery. This integration is critical for property management systems, environmental planning, infrastructure development, and legal boundary determination. The precision of the conversion factor (0.201168 meters per link) ensures that historical lot dimensions can be accurately represented in contemporary digital databases, preventing boundary disputes and ensuring legal property descriptions remain valid when converted to modern coordinate systems.

Common Use Cases

  • Interpreting historical land deeds and title documents in the US, UK, Canada, and Australia
  • Converting cadastral survey coordinates to metric format for GIS and mapping software
  • Reconciling historical field notes with modern GPS measurements
  • Agricultural land planning where plot dimensions appear in chains and links
  • Legal boundary disputes requiring translation between historical and modern measurement systems

Accuracy and Sources

The conversion factor of 0.201168 meters per link is internationally recognized. The National Institute of Standards and Technology (NIST) publishes authoritative unit conversion tables establishing this equivalence. The NIST Special Publication 811 further codifies relationships between U.S. customary units and SI metric units, confirming that 1 link = 0.201168 m exactly — derived from the legal definition of the foot (1 foot = 0.3048 meters exactly), the chain's 66-foot length, and its 100-link composition.

Reference

Frequently asked questions

What is a surveyor's link and how long is it in meters?
A surveyor's link, also called a Gunter's chain link, is a unit of length equal to exactly 0.201168 meters, which is approximately 7.92 inches or 0.66 feet. It originates from Edmund Gunter's 1620 surveying chain, which contained 100 iron links spanning a total of 66 feet. This unit remains legally significant in historical land records across the United States, United Kingdom, Australia, and Canada, where millions of property deeds still express boundary lengths in links and chains.
How do you convert links to meters using the formula?
To convert links to meters, multiply the number of links by 0.201168. The formula is: meters = links x 0.201168. For example, 500 links equals 500 x 0.201168 = 100.584 meters. For the reverse conversion, divide the meter value by 0.201168. So 100 meters equals 100 / 0.201168 = 496.96 links. The conversion factor is exact, derived from the legal definition of the foot, and standardized by NIST in their official unit conversion publications.
How many surveyor's links equal one meter?
One meter equals approximately 4.9709 surveyor's links. This value comes from dividing 1 by 0.201168, the number of meters in a single link. In practical terms, 5 links approximates 1 meter with an error of only about 0.58%. For precision surveying and legal boundary work, always apply the exact factor of 4.9709 links per meter to prevent rounding errors from compounding across longer measured distances or large land parcels.
Why do historical land deeds use links and chains instead of meters?
Historical land deeds in the United States, United Kingdom, and Commonwealth countries used links and chains because Gunter's chain system made area calculations straightforward long before electronic calculators existed. Ten square chains equal exactly one acre, 80 chains equal one mile, and 10 chains equal one furlong. Surveyors could compute land areas through simple whole-number multiplication, making chains and links the dominant land measurement system from the 1600s through the early 20th century across the English-speaking world.
Is the link unit still used in modern land surveying?
The link unit is rarely used in active modern surveying, which now relies predominantly on meters, feet, and GPS coordinates. However, the link remains legally significant because millions of property titles, deeds, and cadastral records in the United States, Australia, Canada, and the United Kingdom still describe lot boundaries in chains and links. Surveyors, title examiners, and GIS analysts regularly perform link-to-meter conversions when reconciling these historical documents with current GPS measurements and digital mapping databases.
What is the difference between a surveyor's link and a chain?
A chain is a unit of length equal to 66 feet or 20.1168 meters, while a link is exactly 1/100th of a chain, equaling 0.66 feet or 0.201168 meters. Gunter's original surveying instrument physically consisted of 100 iron links joined by rings, making the relationship between the two units literal and exact. Area is traditionally expressed in square chains, where one acre equals precisely 10 square chains, illustrating the deliberate mathematical elegance that Gunter built into his system for practical field use.