What is a square foot (US survey)?

It is a unit of area based on the square of the U.S. survey foot, used mainly in U.S. land surveying and legal property descriptions. It differs slightly from the international square foot.

How is a square mile (US survey) defined?

A square mile (US survey) is the area of a square with sides of one US survey mile, equivalent to 640 survey acres and based on the US survey foot.

Why is it important to use US survey units consistently?

Because the US survey foot differs slightly from the international foot, consistent use prevents small but meaningful errors in large-scale land measurements.

Can this conversion be used for historical land records?

Yes, it helps interpret and convert historical land measurement data originally recorded in US survey feet and miles.

How to Convert from Square foot (US survey) to Square mile (US survey)?

Learn how to convert area measurements from square foot (US survey) to square mile (US survey) using this easy-to-use online unit converter designed for land surveying and cadastral purposes in the United States.

Square foot (US survey)

Square mile (US survey)

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

Square foot (US survey) to Square mile (US survey) Conversion Table

Square foot (US survey)	Square mile (US survey)

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 foot (US survey) to Square mile (US survey) Conversion Table
Square foot (US survey)	Square mile (US survey)

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What Is This Tool?

This tool allows users to convert area values accurately from square foot (US survey) to square mile (US survey), two specific units used primarily in U.S. land surveying, cadastral records, and legal property descriptions.

How to Use This Tool?

Enter the area value in square foot (US survey) into the input field
Select square foot (US survey) as the source unit and square mile (US survey) as the target unit
Click the convert button to get the corresponding value in square miles (US survey)
Use the converted result for land management, legal descriptions, or GIS applications

Key Features

Converts between square foot (US survey) and square mile (US survey) units used in U.S. land surveying
Provides conversion based on exact definitions tied to the US survey foot
Suitable for cadastral, geodetic, and public land survey data
Browser-based and easy to use with no installation required

Examples

10,000 square foot (US survey) converts to approximately 0.0003587 square mile (US survey)
50,000 square foot (US survey) converts to approximately 0.0017935 square mile (US survey)

Common Use Cases

Recording parcel and deed areas in U.S. cadastral and legal surveys that use survey-foot units
Describing sections and townships in the Public Land Survey System based on square miles
Converting historical land measurement data that uses US survey feet and miles
Preserving legacy GIS and land-record data with survey-foot and mile units
Supporting geodetic survey calculations with historical unit standards

Tips & Best Practices

Ensure consistent use of US survey units throughout calculations to avoid discrepancies
Consider legacy data formats when interpreting historical land records
Use precise conversion values to minimize error during large-area conversions
Verify unit definitions especially when integrating with international measurement data

Limitations

The US survey foot differs slightly from the international foot, affecting precise calculations
Small but significant errors may occur if mixing survey and international units
Rounding errors may arise due to the very small conversion ratio
Historical data may require careful consideration of original unit standards for accuracy

Frequently Asked Questions

What is a square foot (US survey)?: It is a unit of area based on the square of the U.S. survey foot, used mainly in U.S. land surveying and legal property descriptions. It differs slightly from the international square foot.
How is a square mile (US survey) defined?: A square mile (US survey) is the area of a square with sides of one US survey mile, equivalent to 640 survey acres and based on the US survey foot.
Why is it important to use US survey units consistently?: Because the US survey foot differs slightly from the international foot, consistent use prevents small but meaningful errors in large-scale land measurements.
Can this conversion be used for historical land records?: Yes, it helps interpret and convert historical land measurement data originally recorded in US survey feet and miles.

Key Terminology

Square foot (US survey): A unit of area equal to the square of the US survey foot, primarily used in US land surveying and cadastral records.
Square mile (US survey): An area unit representing a square with sides of one US survey mile, used in US cadastral and land record systems.
US survey foot: A length unit used in US land surveying, defined as exactly 1200/3937 metres, slightly different from the international foot.
Public Land Survey System: A method used in the United States to survey and subdivide land into townships and sections, often using square miles.

Quick Knowledge Check

What unit is used as the basis for a square foot (US survey)?

International foot

U.S. survey foot

Meter

How many US survey feet make one US survey mile?

5,280 feet

3,937 feet

1,200 feet

What is one use of converting square foot (US survey) to square mile (US survey)?

Calculating residential floor areas

Describing sections in the U.S. Public Land Survey System

Measuring ocean area

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