Square Inch to Square Centimeter Converter

Area Converter

20 units available

Decimals:

From

To

6.4516

1 in² = 6.4516 cm²

Formula:

cm² = in² × 6.4516

With your value: 1 in² = 6.4516 cm²

How big is that?

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

Postage stamp (1/1.1 your value)0.930 in²

Your value1.00 in²

A4 sheet (97× your value)96.9 in²

Parking space (1.9e+4× your value)1.94e+4 in²

Tennis court (4.0e+5× your value)4.04e+5 in²

Football pitch (1.1e+7× your value)1.11e+7 in²

Other Square Inch to Square Centimeter conversions

2 in² to cm² 3 in² to cm² 4 in² to cm² 5 in² to cm² 6 in² to cm² 7 in² to cm² 8 in² to cm²

Square Inch to Square Centimeter Conversion Table

Square Inch (in²)	Square Centimeter (cm²)
0.5	3.2258
1	6.4516
2	12.9032
5	32.258
10	64.516
15	96.774
20	129.032
25	161.29
50	322.58
100	645.16
250	1,612.9
500	3,225.8
1000	6,451.6

Square Centimeter to Square Inch Conversion Table

Square Centimeter (cm²)	Square Inch (in²)
0.5	0.0775
1	0.155
2	0.310001
5	0.775002
10	1.550003
15	2.325005
20	3.100006
25	3.875008
50	7.750016
100	15.500031
250	38.750078
500	77.500155
1000	155.00031

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.

Square Inch (in²)

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

Square Centimeter (cm²)

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 Square Inch to Square Centimeter

To convert from Square Inch (in²) to Square Centimeter (cm²), multiply the value by 6.4516.

Formula: cm² = in² × 6.4516

Reverse: in² = cm² × 0.15500031

Step-by-Step Example

Start with your value in Square Inch. For example: 5 in²
Multiply by the conversion factor: 5 x 6.4516
The result is: 32.258 cm²

About Square Inch

The square inch (in²) is a unit of area. One square inch equals 0.00064516 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 Square Centimeter

The square centimeter (cm²) is a unit of area. One square centimeter equals 0.0001 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 Square Centimeter are in 1 Square Inch?

There are exactly 6.4516 Square Centimeter in 1 Square Inch. This means the conversion factor from Square Inch to Square Centimeter is 6.4516.

What is the formula to convert Square Inch to Square Centimeter?

The formula to convert Square Inch to Square Centimeter is: cm² = in² × 6.4516. For example, to convert 10 Square Inch to Square Centimeter, you would multiply 10 by 6.4516.

What is a Square Inch?