What is a circular inch?

A circular inch is the area of a circle with a one-inch diameter, equal to π/4 square inches and equivalent to 1,000,000 circular mils, used for round cross-sectional areas.

Why use square mile (US survey) as a unit?

Square mile (US survey) is a land surveying unit based on the US survey mile and is common in U.S. cadastral records and land boundary descriptions.

Can I convert circular inches directly to acres?

This tool converts circular inches to square mile (US survey); further conversion to acres is possible since one square mile equals 640 acres in the US survey system.

How to Convert from Circular Inch to Square Mile (US Survey)

Learn how to convert area measurements from circular inch, a unit for round cross-sectional areas, to square mile (US survey), a land surveying unit in the United States.

Circular inch

Square mile (US survey)

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

Circular inch to Square mile (US survey) Conversion Table

Circular inch	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.

Circular inch to Square mile (US survey) Conversion Table
Circular inch	Square mile (US survey)

Explore More Area Units Converter

What Is This Tool?

This tool allows you to convert area measurements from circular inch, representing the area of a circle with a one-inch diameter, to square mile (US survey), the area of a square mile used in U.S. land surveying and cadastral records.

How to Use This Tool?

Enter the value in circular inches you want to convert.
Select circular inch as the source unit and square mile (US survey) as the target unit.
Click the convert button to get the equivalent area in square miles (US survey).
Use the displayed result to apply in engineering, GIS, or land surveying contexts.

Key Features

Converts circular inch units to square mile (US survey) based on an exact conversion rate.
Supports conversion between a niche unit for round cross-sectional areas and a large-scale land surveying unit.
Useful for integrating electrical or engineering area data with geographic or cadastral information.
Browser-based and easy to use for quick area conversions.
Includes examples for practical conversion across different scales.

Examples

10 circular inches equals approximately 1.9564006886652e-9 square mile (US survey).
1,000,000 circular inches equals about 0.00019564 square mile (US survey).

Common Use Cases

Specifying cross-sectional areas of large round electrical conductors and cables.
Calculating areas of round rods, shafts, or piping with diameters measured in inches.
Describing sections and townships in the U.S. Public Land Survey System where one section equals one square mile.
Recording legal property boundaries and cadastral maps surveyed using US survey feet and miles.
Converting legacy GIS and land-record data that use US survey units instead of international units.

Tips & Best Practices

Always verify unit definitions and ensure the correct units are selected before conversion.
Be mindful that circular inch is niche and mainly used for round cross-sectional area calculations.
Account for differences between US survey units and international units when integrating data.
Use scientific notation for very small converted values to maintain clarity.
Double-check large land survey data to ensure compatibility with converted electrical or engineering measurements.

Limitations

Circular inch is mainly applicable to round cross-sectional areas, limiting broader area measurement uses.
US survey units differ slightly from international units, which can cause discrepancies.
Converted values to square mile can become extremely small, requiring careful precision and notation.

Frequently Asked Questions

What is a circular inch?: A circular inch is the area of a circle with a one-inch diameter, equal to π/4 square inches and equivalent to 1,000,000 circular mils, used for round cross-sectional areas.
Why use square mile (US survey) as a unit?: Square mile (US survey) is a land surveying unit based on the US survey mile and is common in U.S. cadastral records and land boundary descriptions.
Can I convert circular inches directly to acres?: This tool converts circular inches to square mile (US survey); further conversion to acres is possible since one square mile equals 640 acres in the US survey system.

Key Terminology

Circular Inch: The area of a circle with a one-inch diameter, equal to π/4 square inches or 1,000,000 circular mils, used for round cross-sectional areas.
Square Mile (US Survey): An area unit representing the area of a square with sides of one US survey mile, used in land surveying and cadastral records in the United States.
US Survey Foot: A unit of length equal to 1200/3937 meters, used in defining US survey miles and land survey measurements.

Quick Knowledge Check

What does one circular inch represent?

Area of a square with 1-inch sides

Area of a circle with 1-inch diameter

Length of a 1-inch circular wire

Which unit is used mainly in U.S. land surveying?

Square meter

Square mile (US survey)

Circular mil

What is a common use for circular inch?

Measuring land property sizes

Expressing cross-sectional area of round conductors

Calculating volume of pipes

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