What is an acre (US survey)?

An acre (US survey) is a unit of area based on a survey foot measuring exactly 1200/3937 metres, used primarily in U.S. land surveying and legal cadastral records.

Why convert acres to square kilometers?

Converting acres to square kilometers facilitates international comparisons and reporting using the SI system, especially important in large-scale land and environmental analyses.

Is the U.S. survey acre the same as the international acre?

No, the U.S. survey acre is slightly larger than the international acre, so specifying the acre type is important for precise conversions.

How to Convert Acre (US survey) to Square Kilometer [km²]

Learn how to convert area measurements from acre (US survey) to square kilometer using a precise conversion factor. Understand usage contexts, benefits, and best practices for accurate land measurement conversions.

Acre (US survey) [ac]

Square kilometer [km^2]

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

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

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

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

Explore More Area Units Converter

What Is This Tool?

This converter allows you to transform area values from the acre (US survey), a common unit used in U.S. land surveying, into square kilometers, the SI unit for measuring large land areas. It simplifies interpreting and comparing land sizes across different measurement systems.

How to Use This Tool?

Enter the area value in acre (US survey) into the input field.
Select 'acre (US survey)' as the from unit and 'square kilometer [km²]' as the to unit.
Click the convert button to get the equivalent area measurement in square kilometers.

Key Features

Converts acre (US survey) values to square kilometers using an exact established conversion factor.
Supports applications in land surveying, real estate, environmental planning, and cadastral mapping.
Helps users interpret and analyze U.S. surveying data within international unit systems.

Examples

5 acre (US survey) converts to 0.020234363 square kilometers.
100 acre (US survey) converts to 0.40468726 square kilometers.

Common Use Cases

Describing parcel sizes in U.S. property and legal boundary records.
Converting acreage measurements for international environmental and urban planning reports.
Analyzing agricultural land area statistics using different unit systems.

Tips & Best Practices

Always specify the acre type to avoid confusion with international acres.
Use the exact conversion factor provided for accurate results.
Be cautious of potential rounding when dealing with very large areas or historical data.

Limitations

The U.S. survey acre slightly differs in size from the international acre, requiring precise unit identification.
Rounded values can introduce minor inaccuracies in large-scale calculations.
The tool assumes ideal unit definitions and does not adjust for irregular land shapes or topography.

Frequently Asked Questions

What is an acre (US survey)?: An acre (US survey) is a unit of area based on a survey foot measuring exactly 1200/3937 metres, used primarily in U.S. land surveying and legal cadastral records.
Why convert acres to square kilometers?: Converting acres to square kilometers facilitates international comparisons and reporting using the SI system, especially important in large-scale land and environmental analyses.
Is the U.S. survey acre the same as the international acre?: No, the U.S. survey acre is slightly larger than the international acre, so specifying the acre type is important for precise conversions.

Key Terminology

Acre (US survey): An area unit used in U.S. land surveying, equal to 43,560 square U.S. survey feet, defined based on the U.S. survey foot unit.
Square kilometer [km²]: The SI derived unit representing the area of a square with sides exactly one kilometer in length.
Cadastral Mapping: The process of documenting land parcels and boundaries typically used in legal and land management contexts.

Quick Knowledge Check

What defines one acre (US survey)?

Area equivalent to 43,560 international feet squared

Area equal to 43,560 square U.S. survey feet

Exactly 4,000 square meters

What is one square kilometer equal to?

The area of a square with sides one meter long

The area of a square with sides one kilometer long

The area of a circle with one kilometer radius

Why must you specify the acre type when converting?

Because conversion formulas differ for different acre types

Because the U.S. survey acre is slightly larger than the international acre

Because acres and kilometers are unrelated units