Square CM to Square Inches Converter
Handy for converting small metric surface areas, such as labels and sensor sizes, into square inches.
1 cm² = 0.155 in²
square inches
1 cm² = 0.155 in²
How to convert square centimeters to square inches
Divide the number of square centimeters by 6.4516.
Formula
in² = cm² ÷ 6.4516
For a quick estimate, multiply by about 0.155000.
Examples
- 10 cm² ÷ 6.4516 = 1.55 in²
- 100 cm² ÷ 6.4516 = 15.5 in²
- 500 cm² ÷ 6.4516 = 77.5002 in²
Square centimeters to square inches conversion table
| Square centimeters (cm²) | Square inches (in²) |
|---|---|
| 1 | 0.155 |
| 5 | 0.775 |
| 6.4516 | 1 |
| 10 | 1.55 |
| 20 | 3.1 |
| 25 | 3.875 |
| 50 | 7.75 |
| 100 | 15.5 |
| 150 | 23.25 |
| 200 | 31.0001 |
| 250 | 38.7501 |
| 500 | 77.5002 |
| 1,000 | 155.0003 |
Values rounded to 4 decimal places or 4 significant digits.
About square centimeters
A square centimeter is the area of a square 1 cm on each side, equal to 100 mm². It suits small surfaces such as labels, photos and skin patches.
About square inches
A square inch is exactly 6.4516 cm². Besides small surfaces, it appears in the US pressure unit psi: pounds per square inch.
Frequently asked questions
How many square inches are in one square centimeter?
One square centimeter equals 0.155 square inches (rounded).
How do I convert square centimeters to square inches?
Divide the number of square centimeters by 6.4516. For example: 100 cm² ÷ 6.4516 = 15.5 in².
How many square centimeters are in one square inch?
One square inch equals 6.4516 square centimeters.
Is the cm² to in² conversion exact?
Yes. The factor follows directly from the official definitions of both units, so the only rounding is in how many decimals are displayed.