Square Centimeters to Square Inches Converter (sq cm to sq in)
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Convert Square Inches to Square Centimeters (sq in to sq cm) ▶

Conversion Table

square centimeters to square inches
sq cmsq in
1 sq cm 0.155 sq in
2 sq cm 0.31 sq in
3 sq cm 0.465 sq in
4 sq cm 0.62 sq in
5 sq cm 0.775 sq in
6 sq cm 0.93 sq in
7 sq cm 1.085 sq in
8 sq cm 1.24 sq in
9 sq cm 1.395 sq in
10 sq cm 1.55 sq in
11 sq cm 1.705 sq in
12 sq cm 1.86 sq in
13 sq cm 2.015 sq in
14 sq cm 2.17 sq in
15 sq cm 2.325 sq in
16 sq cm 2.48 sq in
17 sq cm 2.635 sq in
18 sq cm 2.79 sq in
19 sq cm 2.945 sq in
20 sq cm 3.1 sq in

How to convert

1 square centimeter (sq cm) = 0.15500031 square inch (sq in). Square Centimeter (sq cm) is a unit of Area used in Metric system. Square Inch (sq in) is a unit of Area used in Standard system.

Square Centimeter: A Unit of Area

A square centimeter is a unit of area in the metric system. It is equal to the area of a square with sides that measure 1 centimeter. The symbol for square centimeter is cm2.

Definition of the Square Centimeter

The square centimeter is defined as the area of a square that has a side length of 1 centimeter. This is equivalent to 0.0001 square meter, or 0.155 square inch, or 0.001076 square foot.

The square centimeter is a derived unit in the International System of Units (SI), which means that it is derived from the base unit of length, the meter. It is also a coherent unit, which means that it does not require any conversion factor when used with other SI units.

History of the Square Centimeter

The square centimeter was introduced in France in 1795 as part of the metric system, which aimed to simplify and standardize the units of measurement. The metric system was based on the decimal system, which used powers of ten to relate different units of the same quantity.

The square centimeter was originally intended to be a unit of area equal to one hundredth of a square decimeter, or one ten-thousandth of a square meter. However, due to a mistake in the definition of the meter at that time, the actual area of a square centimeter was slightly smaller than intended. This error was corrected in 1889, when the meter was redefined based on the distance between two marks on a platinum-iridium bar kept in Paris.

The square centimeter became widely used throughout the world for measuring small areas, especially in science, engineering, and medicine. It is also used in some everyday applications, such as measuring paper size, clothing size, and skin area.

How to Convert Square Centimeter to Other Units

To convert a square centimeter to other units of area, we can use the following conversion factors:

  • 1 square centimeter = 0.0001 square meter
  • 1 square centimeter = 0.01 square decimeter
  • 1 square centimeter = 0.000001 square kilometer
  • 1 square centimeter = 0.155 square inch
  • 1 square centimeter = 0.001076 square foot
  • 1 square centimeter = 0.00001196 square yard

To convert from other units to a square centimeter, we can use the inverse of these conversion factors.

For example, to convert 50 square inches to square centimeters, we can use:

50 square inches x (6.452 cm2 / 1 sq in) = 322.6 cm2

Where Square Centimeter is Used

The square centimeter is commonly used in many countries for measuring small areas, especially in science, engineering, and medicine. It is also used in some everyday applications, such as measuring paper size, clothing size, and skin area.

Some examples of uses of the square centimeter are:

  • The standard paper size for printing documents in most countries is A4, which has an area of 623.7 cm2.
  • The average adult human body has a skin surface area of about 18,000 cm2.
  • The smallest blood cells in the human body are platelets, which have an average diameter of about 2 micrometers and an area of about 3 x 10^-6 cm2.
  • The largest coin in circulation in the United States is the half dollar, which has a diameter of 3.06 cm and an area of about 7.34 cm2.
  • The smallest country in the world by area, Vatican City, has an area of about 44 million cm2.

Example Conversions of Square Centimeter to Other Units

Here are some example conversions of a square centimeter to other units:

  • 1 square centimeter = 0.0001 square meter
  • 1 square centimeter = 0.01 square decimeter
  • 1 square centimeter = 0.000001 square kilometer
  • 1 square centimeter = 0.155 square inch
  • 1 square centimeter = 0.001076 square foot
  • 1 square centimeter = 0.00001196 square yard
  • 1 square centimeter = 10000 micrometers^2

Square Inch: A Unit of Area

A square inch is a unit of area measurement of a space. It is equal to the area of a square with sides of one inch in length. The symbol for square inch is in2.

Definition of the Square Inch

The square inch is defined as the area of a square that has a side length of 1 inch. This is equivalent to 0.00064516 square meter, or 6.4516 square centimeter, or 0.00000003937 square mile.

The square inch is not an official unit in the International System of Units (SI), but it is commonly used in the United States and the United Kingdom. It is also a customary unit in some other countries that use the imperial or US customary system of measurement.

History of the Square Inch

The square inch was derived from the inch, which was originally based on the length of three barleycorns laid end to end. The inch was first standardized by King Edward II of England in 1324, who defined it as equal to three grains of barley, dry and round, placed end to end lengthwise.

The square inch was used as a unit of area for measuring land, buildings, and other objects. It was also used as a unit of pressure, such as pounds per square inch (psi), which is still widely used today.

The square inch was gradually replaced by the metric units of area, such as the square meter and the square centimeter, in most countries that adopted the metric system. However, it is still widely used in some fields and applications, such as engineering, carpentry, printing, and clothing.

How to Convert Square Inch to Other Units

To convert a square inch to other units of area, we can use the following conversion factors:

  • 1 square inch = 0.00064516 square meter
  • 1 square inch = 6.4516 square centimeter
  • 1 square inch = 0.00000003937 square mile
  • 1 square inch = 0.00001076 square foot
  • 1 square inch = 0.0001196 square yard
  • 1 square inch = 645.16 square micrometer

To convert from other units to a square inch, we can use the inverse of these conversion factors.

For example, to convert 50 square centimeters to square inches, we can use:

50 square centimeters x (0.155000310 in2 / 1 cm2) = 7.7500155 in2

Where Square Inch is Used

The square inch is commonly used in many countries for measuring small areas, especially in engineering, carpentry, printing, and clothing. It is also used as a unit of pressure, such as pounds per square inch (psi).

Some examples of uses of the square inch are:

  • The average size of an adult human fingernail is about 0.5 in2.
  • The standard paper size for printing documents in the United States and Canada is letter, which has an area of 93.5 in2.
  • The smallest unit of measurement for digital images is a pixel, which can have an area ranging from less than 0.00000155 in2 to more than 0.0155 in2 depending on the resolution and size of the screen.
  • The largest coin in circulation in the United States is the half dollar, which has an area of about 0.7854 in2.
  • The smallest state in the United States by area, Rhode Island, has an area of about 777 billion in2.

Example Conversions of Square Inch to Other Units

Here are some example conversions of a square inch to other units:

  • 1 square inch = 0.00064516 square meter
  • 1 square inch = 6.4516 square centimeter
  • 1 square inch = 0.00000003937 square mile
  • 1 square inch = 0.00001076 square foot
  • 1 square inch = 0.0001196 square yard
  • 1 square inch = 645.16 square micrometer
  • 1 square inch = 1000000 nanometers^2
Square inches also can be marked as in2.



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