What is the main difference between an acre and a U.S. survey acre?

The U.S. survey acre is defined using the U.S. survey foot and is very slightly larger than the international acre, reflecting different base foot measurements.

When should I use the U.S. survey acre instead of the international acre?

Use the U.S. survey acre primarily when working with U.S. land surveying data, legal property deeds, and cadastral records that specifically reference the U.S. survey foot system.

Is the size difference between these two acre units significant?

The difference is extremely small but can be significant for precise legal, surveying, or cadastral applications.

How to Convert from Acre [ac] to Acre (US survey) [ac]

Convert between the international acre and the U.S. survey acre accurately for land measurement, surveying, and legal purposes in the United States.

Acre [ac]

Acre (US survey) [ac]

Please check your input. It must be a valid numeric value.

Acre [ac] to Acre (US survey) [ac] Conversion Table

Acre [ac]	Acre (US survey) [ac]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Acre [ac] to Acre (US survey) [ac] Conversion Table
Acre [ac]	Acre (US survey) [ac]

Explore More Area Units Converter

What Is This Tool?

This unit converter allows you to convert area measurements from an international acre to a U.S. survey acre, ensuring accurate land measurement and legal compliance in U.S. cadastral and real estate documents.

How to Use This Tool?

Enter the area value in international acres in the input field.
Select the conversion direction to U.S. survey acres.
Click the convert button to get the equivalent area in U.S. survey acres.

Key Features

Converts between international acre and U.S. survey acre units
Supports precise area measurement for real estate and land surveying
Browser-based and easy to use for quick conversions
Accounts for the subtle difference in foot definitions in each acre type

Examples

5 acres [ac] converts to 4.99998 acres (US survey) [ac]
100 acres [ac] converts to 99.9996 acres (US survey) [ac]

Common Use Cases

Measuring farmland area for agriculture and crop planning using consistent units
Describing residential or commercial property size in U.S. real estate listings and deeds
Conducting land surveying and cadastral mapping based on U.S. survey foot data
Interpreting historical agricultural land records that use U.S. survey measurements
Completing property tax assessments and zoning with accurate area units

Tips & Best Practices

Always verify which acre unit is applicable depending on your geographic and legal context
Use the U.S. survey acre when dealing with U.S. survey foot–based land records to maintain legal accuracy
Apply this conversion cautiously for precise surveying or legal documentation due to the slight size difference
Avoid mixing international acres with U.S. survey acres without conversion in official documents

Limitations

The difference between international and U.S. survey acres is very small but important for legal accuracy
This conversion is specifically relevant to U.S. measurement systems and may not apply elsewhere
Users should ensure the correct acre definition to prevent mistakes in land measurement or property records

Frequently Asked Questions

What is the main difference between an acre and a U.S. survey acre?: The U.S. survey acre is defined using the U.S. survey foot and is very slightly larger than the international acre, reflecting different base foot measurements.
When should I use the U.S. survey acre instead of the international acre?: Use the U.S. survey acre primarily when working with U.S. land surveying data, legal property deeds, and cadastral records that specifically reference the U.S. survey foot system.
Is the size difference between these two acre units significant?: The difference is extremely small but can be significant for precise legal, surveying, or cadastral applications.

Key Terminology

Acre [ac]: A non-SI unit of area primarily used for land measurement; defined as exactly 43,560 international square feet.
Acre (US survey) [ac]: An area unit defined using the U.S. survey foot totaling 43,560 square U.S. survey feet; slightly larger than the international acre.
U.S. Survey Foot: A foot measurement used in U.S. surveying defined exactly as 1200/3937 meters, differing slightly from the international foot.

Quick Knowledge Check

What defines the size of the U.S. survey acre?

Exactly 43,560 international square feet

Exactly 43,560 square U.S. survey feet

Exactly 4,840 square yards

In which field is converting between international and U.S. survey acres most commonly used?

Astronomy

U.S. land surveying and legal property documentation

Cooking measurements

Why is it important to apply the correct acre standard in conversions?

Because the units are identical

To avoid discrepancies in legal and surveying contexts due to slight differences

Because it speeds up the conversion process

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