What is a square kilometer used for?

A square kilometer measures large areas such as countries, cities, or parks, and is commonly applied in environmental studies and urban planning.

Why is the U.S. survey acre slightly larger than an international acre?

Because it is based on the U.S. survey foot, which differs slightly in length from the international foot, making the U.S. survey acre about 4,046.8726 square meters.

When should I convert square kilometers to U.S. survey acres?

Conversion is helpful when interpreting or communicating land area data used in U.S. legal descriptions, land surveying, or historic cadastral records.

How to Convert from Square kilometer [km^2] to Acre (US survey) [ac]

Learn how to convert area measurements from square kilometers (km²) to U.S. survey acres (ac), a unit commonly used in U.S. land surveying and legal descriptions.

Square kilometer [km^2]

Acre (US survey) [ac]

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

Square kilometer [km^2] to Acre (US survey) [ac] Conversion Table

Square kilometer [km^2]	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.

Square kilometer [km^2] to Acre (US survey) [ac] Conversion Table
Square kilometer [km^2]	Acre (US survey) [ac]

Explore More Area Units Converter

What Is This Tool?

This converter allows users to change area values from square kilometers, a large metric unit, into U.S. survey acres, which are often used in land records and surveying within the United States.

How to Use This Tool?

Enter the area value in square kilometers (km²).
Select the source unit as square kilometer [km²].
Choose the target unit as acre (US survey) [ac].
Click convert to see the equivalent area in U.S. survey acres.

Key Features

Converts area from square kilometers (km²) to U.S. survey acres (ac).
Uses an established conversion rate based on official definitions.
Ideal for interpreting land data in U.S. legal and cadastral contexts.
Browser-based and easy to use without requiring software installation.

Examples

Converting 2 square kilometers results in approximately 494.21 U.S. survey acres.
Converting 0.5 square kilometers results in roughly 123.55 U.S. survey acres.

Common Use Cases

Real estate and land surveying within the United States.
Interpreting and converting measurements in legal property deeds.
Analyzing agricultural land sizes and environmental park areas.
Working with cadastral maps based on U.S. survey foot measurements.

Tips & Best Practices

Ensure to verify the unit standards applicable in your geographic region.
Use this conversion when dealing with historical or official U.S. land records.
Be aware of the slight difference between U.S. survey acre and international acre units.
Double-check converted values for use in legal or cadastral documentation.

Limitations

The U.S. survey acre is slightly larger than the international acre due to its definition via the U.S. survey foot.
Small discrepancies can arise when precision is crucial in legal or cadastral work.
Users should confirm which acre unit standard is required for their specific application.

Frequently Asked Questions

What is a square kilometer used for?: A square kilometer measures large areas such as countries, cities, or parks, and is commonly applied in environmental studies and urban planning.
Why is the U.S. survey acre slightly larger than an international acre?: Because it is based on the U.S. survey foot, which differs slightly in length from the international foot, making the U.S. survey acre about 4,046.8726 square meters.
When should I convert square kilometers to U.S. survey acres?: Conversion is helpful when interpreting or communicating land area data used in U.S. legal descriptions, land surveying, or historic cadastral records.

Key Terminology

Square kilometer [km²]: An SI derived unit of area equal to the area of a square with sides one kilometre long, used for large land and water measurements.
Acre (US survey) [ac]: A U.S.-based unit of area defined by 43,560 square U.S. survey feet, mainly used in land surveying and legal records in the U.S.
U.S. survey foot: A measurement unit defined as exactly 1200/3937 metres, forming the basis for the U.S. survey acre.

Quick Knowledge Check

Which unit is the square kilometer (km²) primarily used to measure?

Land parcels in the U.S.

Large two-dimensional areas

Small household items

What is distinctive about the U.S. survey acre?

It uses the international foot

It is based on the U.S. survey foot

It is smaller than the international acre

When is converting from km² to U.S. survey acres most relevant?

In European land surveying

For U.S. property legal descriptions

For measuring ocean areas

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