Circular Mil to Circular Inch Converter

Area Converter

20 units available

Decimals:

From

To

1.000000e-6

1 cmil = 1.000000e-6 circ in

Formula:

circ in = cmil × 0.000001

With your value: 1 cmil = 1.000000e-6 circ in

How big is that?

Everyday references on a logarithmic scale, all expressed in circular mil so you can sanity-check the result.

Your value1.00 cmil

Postage stamp (1.2e+6× your value)1.18e+6 cmil

A4 sheet (1.2e+8× your value)1.23e+8 cmil

Parking space (2.5e+10× your value)2.47e+10 cmil

Tennis court (5.1e+11× your value)5.15e+11 cmil

Football pitch (1.4e+13× your value)1.41e+13 cmil

Other Circular Mil to Circular Inch conversions

2 cmil to circ in 3 cmil to circ in 4 cmil to circ in 5 cmil to circ in 6 cmil to circ in 7 cmil to circ in 8 cmil to circ in

Circular Mil to Circular Inch Conversion Table

Circular Mil (cmil)	Circular Inch (circ in)
0.5	5.000000e-7
1	1.000000e-6
2	2.000000e-6
5	5.000000e-6
10	1.000000e-5
15	1.500000e-5
20	2.000000e-5
25	2.500000e-5
50	5.000000e-5
100	0.0001
250	0.00025
500	0.0005
1000	0.001

Circular Inch to Circular Mil Conversion Table

Circular Inch (circ in)	Circular Mil (cmil)
0.5	500,000
1	1,000,000
2	2,000,000
5	5,000,000
10	10,000,000
15	15,000,000
20	20,000,000
25	25,000,000
50	50,000,000
100	100,000,000
250	250,000,000
500	500,000,000
1000	1,000,000,000

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Circular Mil (cmil)

Area

Exact conversion

Derived from the square metre via the length definitions above.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Circular Inch (circ in)

Area

Exact conversion

Derived from the square metre via the length definitions above.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Circular Mil to Circular Inch

To convert from Circular Mil (cmil) to Circular Inch (circ in), multiply the value by 1.000000e-6.

Formula: circ in = cmil × 0.000001

Reverse: cmil = circ in × 1,000,000

Step-by-Step Example

Start with your value in Circular Mil. For example: 5 cmil
Multiply by the conversion factor: 5 x 1.000000e-6
The result is: 5.000000e-6 circ in

About Circular Mil

The circular mil (cmil) is a unit of area. One circular mil equals 5.067075 × 10^-10 square metres. UnitConvertLab converts it against every other area unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: area calculations, engineering and science, education.

About Circular Inch

The circular inch (circ in) is a unit of area. One circular inch equals 0.0005067074791 square metres. UnitConvertLab converts it against every other area unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: area calculations, engineering and science, education.

Frequently Asked Questions

How many Circular Inch are in 1 Circular Mil?

There are exactly 1.000000e-6 Circular Inch in 1 Circular Mil. This means the conversion factor from Circular Mil to Circular Inch is 1.000000e-6.

What is the formula to convert Circular Mil to Circular Inch?

The formula to convert Circular Mil to Circular Inch is: circ in = cmil × 0.000001. For example, to convert 10 Circular Mil to Circular Inch, you would multiply 10 by 1.000000e-6.

What is a Circular Mil?