What is a circular inch?

A circular inch is the area of a circle with a diameter of one inch, equal to π/4 square inches or about 0.785398 square inches.

How is square mil different from circular mil?

Square mil is the area of a square with a side length of one mil, whereas a circular mil is the area of a circle with a one mil diameter.

When should I use this converter?

Use this converter to convert round cross-sectional areas measured in circular inches to very small planar areas in square mils, common in electrical engineering and manufacturing.

How to Convert from Circular Inch to Square Mil [mil^2]

Learn how to convert area measurements from circular inch to square mil (mil^2) using a precise and easy unit converter. Suitable for electrical engineering, PCB design, and precision manufacturing.

Circular inch

Square mil [mil^2]

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

Circular inch to Square mil [mil^2] Conversion Table

Circular inch	Square mil [mil^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.

Circular inch to Square mil [mil^2] Conversion Table
Circular inch	Square mil [mil^2]

Explore More Area Units Converter

What Is This Tool?

This tool converts area values from circular inch to square mil (mil^2), useful for expressing the cross-sectional and planar areas of round and flat objects in various engineering fields.

How to Use This Tool?

Enter the area value in circular inches.
Select 'circular inch' as the input unit and 'square mil [mil^2]' as the output unit.
Click convert to get the equivalent area in square mils.

Key Features

Converts circular inch, an area based on a circle with a 1-inch diameter, to square mil, a very small area unit.
Expresses cross-sectional areas of round conductors and cables accurately for engineering use.
Browser-based and simple to use without requiring manual calculations.

Examples

Convert 2 circular inches to square mils: 2 × 785398.16339745 = 1,570,796.33 square mil [mil^2].
Convert 0.5 circular inch to square mils: 0.5 × 785398.16339745 = 392,699.08 square mil [mil^2].

Common Use Cases

Determining cross-sectional area of large round electrical conductors or cables using alternative units.
Computing area for round rods, shafts, or piping when diameter is in inches.
Converting between circular mils and square inches for engineering or electrical applications.
Specifying planar areas of PCB copper traces and pad sizes in electronics using imperial units.
Describing cross-sectional area of rectangular or flat conductors or metal foils in electrical engineering.
Measuring very small surface areas in precision manufacturing or thin films and coatings.

Tips & Best Practices

Use circular inch only for round objects where diameter is measured in inches to avoid inaccuracies.
Choose square mil for expressing very small planar areas, especially in electronics and thin-film measurements.
Consider the scale and appropriateness of units when converting between large and very small areas.
Verify units carefully in engineering calculations to ensure consistency.

Limitations

Circular inch is defined only for round shapes with inch diameters; applying it to non-circular forms may cause errors.
Square mil is intended for very small areas and may not be ideal for larger measurements.
Rounding can affect precision when converting very large or very small values.

Frequently Asked Questions

What is a circular inch?: A circular inch is the area of a circle with a diameter of one inch, equal to π/4 square inches or about 0.785398 square inches.
How is square mil different from circular mil?: Square mil is the area of a square with a side length of one mil, whereas a circular mil is the area of a circle with a one mil diameter.
When should I use this converter?: Use this converter to convert round cross-sectional areas measured in circular inches to very small planar areas in square mils, common in electrical engineering and manufacturing.

Key Terminology

Circular Inch: An area measurement representing a circle with a diameter of one inch, equal to π/4 square inches or approximately 0.785398 in².
Square Mil [mil^2]: An area unit equal to the area of a square with a side of one mil (0.001 inch), used for very small planar areas.
Conversion Rate: The fixed multiplier used to convert an area from circular inches to square mil, which is 785398.16339745.

Quick Knowledge Check

What does one circular inch represent?

The area of a square with 1 inch sides

The area of a circle with a 1-inch diameter

The area of a circle with a 1 mil diameter

Which unit is suitable for very small planar areas?

Square mil [mil^2]

Circular inch

Square inch

What is the approximate conversion rate from circular inch to square mil?

1000 square mil

785,398 square mil

1,000,000 square mil

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