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    Length Conversion

    21 Chain to Foot

    Quick answer

    21 Chain (ch) equals

    1,386 ft

    To convert 21 Chains to feet, multiply by 66. Therefore, 21 Chain (ch) equals 1,386 Foot (ft).

    Formula: ft = ch × 66. Calculation: 21 × 66 = 1,386 ft.

    Convert Chain (ch) to Foot (ft) online with our free unit converter. In length, 1 ch = 66 ft. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.

    Worked example: converting Chain to Foot

    1. Step 1 — start with the formula. ft = ch × 66
    2. Step 2 — substitute your figure. 21 ch × 66
    3. Step 3 — read the result. 21 ch = 1,386 ft
    4. Step 4 — check it in reverse. ch = ft × 0.0151515152 returns Invalid ch, which matches the figure you started with.

    Length Converter

    31 units available

    Decimals:
    1,386

    21 ch = 1,386 ft

    Formula:

    ft = ch × 66

    With your value: 21 ch = 1,386 ft

    How big is that?

    Everyday references on a logarithmic scale, all expressed in chain so you can sanity-check the result.

    London double-decker bus (1/38 your value)0.547 ch
    Olympic pool (1/8.4 your value)2.49 ch
    Football pitch (length) (1/4.0 your value)5.22 ch
    Eiffel Tower (1/1.3 your value)16.4 ch
    Your value21.0 ch
    Burj Khalifa (2.0× your value)41.2 ch

    Other Chain to Foot conversions

    15 ch to ft16 ch to ft18 ch to ft20 ch to ft24 ch to ft25 ch to ft26 ch to ftFull Chain to Foot converter

    Chain to Foot Conversion Table

    Chain (ch)Foot (ft)
    0.533
    166
    2132
    5330
    10660
    15990
    201,320
    251,650
    503,300
    1006,600
    25016,500
    50033,000
    100066,000

    Foot to Chain Conversion Table

    Foot (ft)Chain (ch)
    0.50.007576
    10.015152
    20.030303
    50.075758
    100.151515
    150.227273
    200.30303
    250.378788
    500.757576
    1001.515152
    2503.787879
    5007.575758
    100015.151515

    Where these values come from

    Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

    Chain (ch)

    Length

    Exact conversion

    Traceable to the metre, defined by fixing the speed of light in vacuum at 299 792 458 m/s. Imperial lengths derive from the 1959 international yard (0.9144 m exactly).

    Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

    Bureau International des Poids et Mesures · Reviewed 2026-07-01

    Foot (ft)

    Length

    Exact conversion

    1 foot = 0.3048 m exactly (international foot, 1959).

    The US survey foot (1200/3937 m) was deprecated for new work on 31 December 2022 and differs by about 2 ppm.

    Source: International Yard and Pound Agreement of 1959; NIST Federal Register Notice 59-5442

    US, UK, Canada, Australia, New Zealand, South Africa · Reviewed 2026-07-01

    How to Convert Chain to Foot

    To convert from Chain (ch) to Foot (ft), multiply the value by 66.

    Formula: ft = ch × 66

    Reverse: ch = ft × 0.0151515152

    Step-by-Step Example

    1. Start with your value in Chain. For example: 5 ch
    2. Multiply by the conversion factor: 5 x 66
    3. The result is: 330 ft

    Chain and Foot Relationship

    This calculation facilitates standardized conversion between recognized units of length. Since 1 Chain equals approximately 66 feet, the Chain represents a larger unit interval than the Foot. Understanding the relationship between Chain and Foot is essential for accurate calculations in physics, engineering, commerce, and daily applications.

    About Chain

    Gunter's chain equals 66 feet (20.1168 m) and underpins the US Public Land Survey System: 10 square chains make one acre.

    Common uses of Chain: land surveying, cadastral records, cricket pitch length.

    About Foot

    The foot is an imperial unit equal to 12 inches or 0.3048 meters. It remains widely used in the US, UK, and Canada for everyday measurements.

    Fun Fact: The foot was originally based on the length of a human foot, which varied from region to region.

    Common uses of Foot: height measurement, real estate, construction.

    Frequently Asked Questions

    What is 21 Chain in Foot?
    21 Chain equals 1,386 Foot.
    How many feet are in 1 Chain?
    There are exactly 66 feet in 1 Chain. This means the conversion factor from Chain to Foot is 66.
    What is the formula to convert Chain to Foot?
    The formula to convert Chain to Foot is: ft = ch × 66. For example, to convert 10 Chains to feet, you would multiply 10 by 66.
    What is a Chain?
    Gunter's chain equals 66 feet (20.1168 m) and underpins the US Public Land Survey System: 10 square chains make one acre.
    What is a Foot?
    The foot is an imperial unit equal to 12 inches or 0.3048 meters. It remains widely used in the US, UK, and Canada for everyday measurements.
    What are the common uses of Chain?
    The Chain is commonly used in land surveying, cadastral records, cricket pitch length.

    Related Length Conversions

    Meter → FootKilometer → FootCentimeter → FootMillimeter → FootMicrometer → FootNanometer → FootAngstrom → FootMile → FootYard → Foot

    Cite this page

    UnitConvertLab. (2026). 21 Chain to Foot. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/21-chain-to-foot