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Square Centimeters to Square Inches (cm² to in²) Converter

1 square centimeter (cm²) = 0.155 square inches (in²). To convert square centimeters to square inches, multiply by 0.155: 25 cm² × 0.155 = 3.87501 in². Also searched as square centimetres to square inches.

1 cm² = 0.15500031 in²
Convert the other way: Square Inches to Square Centimeters

Quick facts

How to convert square centimeters to square inches

  1. Take the value in square centimeters.
  2. Multiply it by 0.155 (the number of square inches in one square centimeter).
  3. Round the result to the precision you need.
in² = cm² × 0.155

Worked example: 25 cm² × 0.155 = 3.87501 in².

To convert square inches back to square centimeters, multiply by 6.4516, or divide by 0.155.

Source: NIST SP 811 (2008). Marla and kanal use the Punjab standard stated in their definitions; local sizes can differ.

Square Centimeters to Square Inches conversion table

Square Centimeters to Square Inches conversion table
Square Centimeters [cm²]Square Inches [in²]
0.01 cm²0.0015500031 in²
0.1 cm²0.015500031 in²
1 cm²0.15500031 in²
2 cm²0.31000062 in²
3 cm²0.46500093 in²
5 cm²0.77500155 in²
10 cm²1.5500031 in²
20 cm²3.1000062 in²
50 cm²7.7500155 in²
100 cm²15.5000310001 in²
1000 cm²155.0003100006 in²

cm² to in² chart from 1 to 100

Square Inches to Square Centimeters conversion table

Square Inches to Square Centimeters conversion table
Square Inches [in²]Square Centimeters [cm²]
0.01 in²0.064516 cm²
0.1 in²0.64516 cm²
1 in²6.4516 cm²
2 in²12.9032 cm²
3 in²19.3548 cm²
5 in²32.258 cm²
10 in²64.516 cm²
20 in²129.032 cm²
50 in²322.58 cm²
100 in²645.16 cm²
1000 in²6451.6 cm²

Square Centimeters vs Square Inches

Square CentimeterSquare Inch
Symbolcm²in²
Equals1 cm² = 0.155 in²1 in² = 6.4516 cm²

What is a square centimeter?

The area of a square with 1-centimeter sides. Used for small object surface areas.

What is a square inch?

The area of a square with 1-inch sides. Used in the US for small material and screen surface areas.

Frequently asked questions

How many square inches are in a square centimeter?

There are 0.155 square inches in 1 square centimeter (1 cm² = 0.15500031 in²).

How many square centimeters are in a square inch?

There are 6.4516 square centimeters in 1 square inch (1 in² = 6.4516 cm²).

How do I convert square centimeters to square inches?

Multiply the number of square centimeters by 0.155. For example, 10 cm² × 0.155 = 1.55 in². To convert back, multiply by 6.4516.

What is 10 cm² in square inches?

10 cm² = 1.55 in².

What is 100 cm² in square inches?

100 cm² = 15.5 in².

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST SP 811 (2008). Marla and kanal use the Punjab standard stated in their definitions; local sizes can differ). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026