Convert Square Inches to Square Centimeters
1 square inch (in²) equals 6.4516 square centimeters (cm²).
1 in² = 6.4516 cm²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk square inch to square centimeter converter to paste a column from Excel.
How to Convert Square Inch to Square Centimeter
- 1 in² = 6.4516 cm²
- 1 cm² = 0.15500031 in²
- Example: convert 15 in² to cm²: 15 in² = 15 × 6.4516 cm² = 96.774 cm²
Formula
cm² = in² × 6.4516
Derivation from SI units:
- 1 in² = (0.0254 m)² = 6.4516 × 10⁻⁴ m² = 6.4516 cm²
- 1 cm² = (0.01 m)² = 10⁻⁴ m²
- 1 in² = 0.00064516 m² ÷ 0.0001 m² per cm² = 6.4516 cm²
Both units are defined exactly, so the factor is exact. Square Inch definition: square inch; Square Centimeter definition: square centimeter.
Worked examples
- 1 in² is exactly 6.4516 cm².
1 in² × 6.4516 = 6.4516 cm² - A 7 in² test area is 45.1612 cm².
7 in² × 6.4516 = 45.1612 cm²
Square Inch to Square Centimeter conversion table
| Square Inches (in²) | Square Centimeters (cm²) |
|---|---|
| 0.1 in² | 0.64516 cm² |
| 0.25 in² | 1.6129 cm² |
| 0.5 in² | 3.2258 cm² |
| 1 in² | 6.4516 cm² |
| 2 in² | 12.9032 cm² |
| 4 in² | 25.8064 cm² |
| 5 in² | 32.258 cm² |
| 5.94 in² | 38.322504 cm² |
| 7 in² | 45.1612 cm² |
| 10 in² | 64.516 cm² |
| 12 in² | 77.4192 cm² |
| 25 in² | 161.29 cm² |
| 50 in² | 322.58 cm² |
| 100 in² | 645.16 cm² |
| 144 in² | 929.0304 cm² |
| 500 in² | 3225.8 cm² |
| 1000 in² | 6451.6 cm² |
Where it's used
Areas in square inches are converted to cm² for metric drawings and test reports. The factor 6.4516 is exact.
Square Inch to other area units
| Conversion | 1 in² equals |
|---|---|
| square inch to square meter | 0.00064516 m² |
| square inch to square centimeter | 6.4516 cm² |
| square inch to square millimeter | 645.16 mm² |
| square inch to square foot | 0.006944444444 ft² |
Frequently asked questions
Is 1 in² exactly 6.4516 cm²?
Yes, because the inch is defined as exactly 2.54 cm.
How many square centimeters are in 1 square inch?
1 in² = 6.4516 cm².
How do I convert square inches to square centimeters?
Multiply the value in in² by 6.4516. For example, 15 in² × 6.4516 = 96.774 cm².
Is the in² to cm² conversion exact?
Yes. Both units are defined exactly, and 1 in² is exactly 6.4516 cm².
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "square inch (in²)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2 with SI prefix centi.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Square Inches to Square Centimeters. Retrieved October 17, 2026, from https://scientificconverters.com/area/square-inches-to-square-centimeters/
IEEE
Scientific Converters, "Convert Square Inches to Square Centimeters," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/area/square-inches-to-square-centimeters/