Chains to Feet Converter

Chains (ch)

Feet (ft)

Quick Conversions

What is a Chain?

A chain is a traditional unit of length measurement primarily used in surveying and land measurement [web:1]. The most commonly referenced chain is Gunter’s chain, which measures exactly 66 feet or 20.1168 meters [web:2]. This unit was invented by English mathematician Edmund Gunter in 1620 and became the standard measurement for land surveying in English-speaking countries, particularly in the United States [web:6].

The chain consists of 100 links, with each link measuring 7.92 inches [web:9]. This measurement system was specifically designed to simplify calculations when measuring land areas, as 10 square chains equal exactly one acre [web:6]. The chain unit played a crucial role in surveying the American frontier and remains embedded in many historical land records today [web:6].

One Chain Equals
66 Feet
or 100 Links × 7.92 inches each

Popular Chains to Feet Conversions

Chains (ch)	Feet (ft)	Common Application
0.01 ch	0.66 ft	Small property markers
0.1 ch	6.6 ft	Residential boundary segments
0.5 ch	33 ft	Building setbacks
1 ch	66 ft	Standard chain length
2 ch	132 ft	Small plot measurements
3 ch	198 ft	Residential lot depth
5 ch	330 ft	Field boundaries
10 ch	660 ft	Agricultural plots
20 ch	1,320 ft	Quarter mile
40 ch	2,640 ft	Half mile
50 ch	3,300 ft	Large property lines
80 ch	5,280 ft	One mile
100 ch	6,600 ft	Extended land surveys
1,000 ch	66,000 ft	Large tract surveys

Conversion Formulas

Chains to Feet Formula

Feet = Chains × 66

To convert chains to feet, multiply the chain value by 66 [web:1].

Example 1: Convert 5 chains to feet
5 ch × 66 = 330 ft

Example 2: Convert 15 chains to feet
15 ch × 66 = 990 ft [web:1]

Example 3: Convert 0.75 chains to feet
0.75 ch × 66 = 49.5 ft

Feet to Chains Formula

Chains = Feet ÷ 66

Alternatively: Chains = Feet × 0.0151515152 [web:1]

Example: Convert 330 feet to chains
330 ft ÷ 66 = 5 ch

Step-by-Step Conversion Process

Converting Chains to Feet

Identify the number of chains you need to convert
Multiply the chain value by the conversion factor 66
The result is your measurement in feet
Round to the desired decimal places if needed

Converting Feet to Chains

Start with your measurement in feet
Divide the feet value by 66
The quotient represents the number of chains
Express the result with appropriate precision

Visual Comparison

The following visual representations show how chains compare to feet in practical scenarios [web:1][web:6].

1 Chain

66 ft

Standard surveyor’s chain

1 Furlong

10 ch

660 feet

1 Mile

80 ch

5,280 feet

1 Acre

10 sq ch

43,560 square feet

Length Comparison Visualization

1 Chain (66 feet)

66 ft

0.5 Chains (33 feet)

33 ft

5 Chains (330 feet)

330 ft

Surveying Applications

The chain unit has been instrumental in land surveying for centuries and continues to appear in historical land records [web:6][web:9].

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Property Boundaries

Historical property deeds and boundary descriptions often reference chains as the primary measurement unit, especially in areas surveyed before modern GPS technology.

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Land Records

Government land surveys, particularly those conducted under the Land Ordinance of 1785, used Gunter’s chain as the mandated measurement standard for all states west of the original 13 colonies.

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Agricultural Land

Farm and ranch properties were traditionally measured in chains, making it easier to calculate acreage since 10 square chains equal exactly one acre.

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Civil Engineering

Railroad construction and route planning historically used chain measurements for distance calculations and right-of-way determinations.

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Legal Documents

Property titles, easements, and land grants may contain chain measurements that require conversion to modern units for current mapping and development projects.

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Historical Research

Genealogists and historians working with old land records need to convert chain measurements to understand property sizes and locations accurately.

Historical Context

Edmund Gunter invented the surveyor’s chain in 1620, revolutionizing land measurement practices [web:6]. Before Gunter’s invention, surveyors used various inconsistent methods that often led to errors and disputes. Gunter’s chain was specifically designed to be 66 feet long and divided into 100 links, each measuring 7.92 inches [web:9].

The brilliance of this design lies in its mathematical relationships: 10 chains equal one furlong, 80 chains equal one mile, and 10 square chains equal one acre [web:6]. This made calculations significantly simpler for surveyors working in the field. The chain became so fundamental to American land surveying that its measurements are still found in property records throughout the United States today [web:6].

During colonial times and throughout the 1800s, surveyors would use a compass and chain to measure land, typically working in teams where one person would hold the chain while another walked forward, marking distances with pins [web:6][web:9]. While modern GPS and electronic distance measurement have largely replaced physical chains, the unit remains relevant for interpreting historical surveys and legal property descriptions.

Relationship to Other Length Units

Unit	Equivalent to 1 Chain	Conversion Factor
Feet	66 ft	× 66
Yards	22 yd	× 22
Inches	792 in	× 792
Meters	20.1168 m	× 20.1168
Links	100 links	× 100
Rods	4 rd	× 4
Furlongs	0.1 fur	÷ 10
Miles	0.0125 mi	÷ 80

Practical Examples from Surveying

Example 1: Residential Property Line
A property deed states the northern boundary is 7.5 chains long. Converting to feet:
7.5 ch × 66 = 495 ft
The property line extends 495 feet along the northern edge.

Example 2: Agricultural Field
A farmer’s field measures 25 chains by 40 chains. The perimeter in feet is:
Perimeter = 2 × (25 + 40) = 130 chains
130 ch × 66 = 8,580 ft
The field has a perimeter of 8,580 feet.

Example 3: Road Frontage
A parcel has road frontage of 330 feet. Converting to chains:
330 ft ÷ 66 = 5 ch
The property has 5 chains of road frontage, which equals exactly half a furlong.

Example 4: Historical Survey
An 1850s land grant describes a boundary as “commencing at the oak tree, thence north 60 chains.” In modern feet:
60 ch × 66 = 3,960 ft
This equals 0.75 miles or three-quarters of a mile from the starting point.

Accuracy Considerations

When working with historical surveys that used chain measurements, several factors affect accuracy [web:6]:

• Chain Wear: Physical chains stretched and wore over time, introducing measurement errors that could accumulate over long distances.
• Human Error: Miscounting links or improper chain handling could result in inaccuracies in the recorded measurements.
• Terrain Effects: Measuring over slopes without proper correction led to horizontal distance errors since the chain followed the ground surface.
• Temperature Variation: Metal chains expanded in heat and contracted in cold, slightly affecting their length during measurement.
• Rounding Practices: Surveyors often rounded measurements to the nearest link or tenth of a chain, introducing small systematic errors.

Modern resurveys of properties originally measured in chains may reveal discrepancies due to these historical accuracy limitations [web:6]. Professional surveyors account for these factors when interpreting old records and establishing current property boundaries.

Frequently Asked Questions

How many feet are in one chain?

One chain equals exactly 66 feet [web:1]. This standard was established by Edmund Gunter in 1620 and became the basis for land surveying throughout English-speaking countries.

Why is a chain 66 feet long?

The 66-foot length was chosen because it creates convenient mathematical relationships with other units. Ten chains equal one furlong, 80 chains equal one mile, and crucially, 10 square chains equal exactly one acre, simplifying land area calculations for surveyors [web:6].

How do I convert chains to feet?

Multiply the number of chains by 66 to get feet. For example, 5 chains × 66 = 330 feet [web:1]. The conversion factor of 66 is constant and exact.

Are chains still used in surveying today?

Physical chains are rarely used in modern surveying, having been replaced by electronic distance measurement and GPS technology. However, the chain unit remains relevant when interpreting historical land records, property deeds, and legal descriptions that reference this traditional measurement [web:6].

What is the difference between Gunter’s chain and other chains?

Gunter’s chain measures 66 feet and consists of 100 links. Other chains existed, such as Ramsden’s engineer’s chain (100 feet) and Rathborne’s chain, but Gunter’s chain became the standard for land surveying because of its mathematical convenience and was mandated for all U.S. government surveys [web:2][web:6].

How many links are in a chain?

A standard Gunter’s chain contains 100 links, with each link measuring 7.92 inches [web:9]. This division made it easy for surveyors to measure fractions of a chain with precision.

What is a square chain?

A square chain is an area measurement equal to one chain by one chain, or 66 feet × 66 feet = 4,356 square feet. Ten square chains equal exactly one acre, which is why the chain was so useful for land area calculations [web:6].

How accurate were chain measurements?

Chain measurements were subject to various errors including chain wear and stretching, human counting mistakes, terrain effects, and temperature variations [web:6]. Modern resurveys of historically chain-measured properties may reveal small discrepancies due to these accumulated errors.

Can I convert feet to chains?

Yes, divide the number of feet by 66 to get chains. For example, 330 feet ÷ 66 = 5 chains [web:1]. Alternatively, multiply feet by 0.0151515152 to get the equivalent in chains.

What other units relate to chains?

One chain equals 4 rods, 22 yards, 100 links, or 20.1168 meters. In larger units, 10 chains equal one furlong and 80 chains equal one mile [web:1][web:6].

Quick Reference Chart

Chains	Feet	Yards	Meters
0.1	6.6	2.2	2.01
0.25	16.5	5.5	5.03
0.5	33	11	10.06
1	66	22	20.12
1.5	99	33	30.18
2	132	44	40.23
3	198	66	60.35
4	264	88	80.47
5	330	110	100.58
7.5	495	165	150.88
10	660	220	201.17
15	990	330	301.75
20	1,320	440	402.34
25	1,650	550	502.92
50	3,300	1,100	1,005.84