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Square Inches to Square Centimeters (in² to cm²) Converter

1 square inch (in²) = 6.4516 square centimeters (cm²). To convert square inches to square centimeters, multiply by 6.4516: 25 in² × 6.4516 = 161.29 cm². Also searched as square inches to square centimetres.

1 in² = 6.4516 cm²
Convert the other way: Square Centimeters to Square Inches

Quick facts

How to convert square inches to square centimeters

  1. Take the value in square inches.
  2. Multiply it by 6.4516 (the number of square centimeters in one square inch).
  3. Round the result to the precision you need.
cm² = in² × 6.4516

Worked example: 25 in² × 6.4516 = 161.29 cm².

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

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

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

in² to cm² chart from 1 to 100

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

Square Inches vs Square Centimeters

Square InchSquare Centimeter
Symbolin²cm²
Equals1 in² = 6.4516 cm²1 cm² = 0.155 in²

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.

What is a square centimeter?

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

Frequently asked questions

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 many square inches are in a square centimeter?

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

How do I convert square inches to square centimeters?

Multiply the number of square inches by 6.4516. For example, 10 in² × 6.4516 = 64.516 cm². To convert back, multiply by 0.155.

What is 10 in² in square centimeters?

10 in² = 64.516 cm².

What is 100 in² in square centimeters?

100 in² = 645.16 cm².

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