What Is This Tool?
This converter allows you to transform area values from square chains (ch^2), an imperial unit often used in cadastral surveying and historical land measurement, into acres (US survey) [ac], the standard land area unit used in U.S. surveying and legal documents.
How to Use This Tool?
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Enter the area value in square chains (ch^2) you want to convert
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Select 'square chain [ch^2]' as the input unit and 'acre (US survey) [ac]' as the output unit
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Click the convert button to see the converted area in acres (US survey)
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Use the result for land measurement, surveying, or legal documentation purposes
Key Features
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Converts square chains directly to U.S. survey acres with precise conversion rates
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Ideal for interpreting historical land records and modern cadastral maps
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Supports land measurement tasks involving imperial and U.S. customary units
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Browser-based and easy to use without installation
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Provides clear results consistent with U.S. legal and surveying standards
Examples
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5 square chains equals approximately 0.499998 acres (US survey)
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10 square chains equals approximately 0.999996 acres (US survey)
Common Use Cases
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Calculating parcel areas during land surveying in regions using imperial units
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Translating land area measurements on historical deeds and maps to acres
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Recording land sizes in U.S. property deeds and legal boundary descriptions
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Interpreting agricultural land statistics based on U.S. survey feet
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Converting historical chain-based measurements for modern cadastral records
Tips & Best Practices
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Double check unit selections before performing the conversion
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Use this tool when dealing with U.S. legal land descriptions referencing survey acres
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Refer to historical data carefully to ensure correct unit context (square chains vs acres)
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Remember that slight differences exist between U.S. survey feet and international measurements
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For large area conversions, verify results with relevant cadastral records
Limitations
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The acre (US survey) unit is based on the U.S. survey foot which slightly differs from the international foot
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Minimal discrepancies may occur when comparing measurements with non-U.S. systems
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The tool does not account for conversions involving units other than square chains and US survey acres
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This converter assumes use within contexts familiar with imperial and U.S. customary measurement systems
Frequently Asked Questions
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What is a square chain?
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A square chain is an imperial unit of area defined as the area of a square with each side one chain (66 feet), equal to exactly 4,356 square feet.
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How is the acre (US survey) different from an international acre?
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The U.S. survey acre uses the U.S. survey foot, making it very slightly larger than the international acre, and it is primarily used in U.S. land surveying.
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Why convert from square chains to acres (US survey)?
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Converting helps interpret and communicate land areas in modern legal and cadastral contexts where acres are the standard, while still referencing historical units like chains.
Key Terminology
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Square Chain [ch^2]
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An imperial area unit equal to the area of a square with sides of one chain (66 feet), equivalent to 4,356 square feet or one-tenth of an acre.
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Acre (US survey) [ac]
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A U.S. land area unit based on the U.S. survey foot, equal to 43,560 square survey feet, commonly used in U.S. property deeds and cadastral surveying.
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U.S. Survey Foot
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A unit of length used in U.S. surveying that differs slightly from the international foot, used in defining the US survey acre.