A square inch is the area of a one-inch square.
Square inches to Square Centimeters Converter — in2 to cm2
Convert Square inch (in2) to Square Centimeter (cm2) using the exact conversion factor (1 square inch = 6.4516 square centimeter). See the formula, worked examples, and conversion table.
Square inches to Square Centimeters converter
Converter
Area Converter
Convert land, construction, mapping, survey, and scientific area units.
Context values
Some unit families need one extra value for a physically accurate result.
Square metric area unit.
Result = input x 0.00064516 / 0.0001.
Area uses the square meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Square inches to Square Centimeters
Comparing Square inch and Square Centimeter is common in agriculture and real estate, where US land is typically measured in acres and most of the rest of the world uses hectares. Specifically: A square inch is the area of a one-inch square, and square metric area unit.
Formula
square centimeters = square inches × 6.4516
This factor comes from each unit's defined relationship to the category's base unit: 1 square inch equals 0.00064516 base units, and 1 square centimeter equals 0.0001 base units, so dividing one by the other gives the direct square inch-to-square centimeter factor of 6.4516.
Simple example
1 in2 × 6.4516 = 6.4516 cm2
1 square inch = 6.4516 square centimeters.
Real-world example
10 in2 × 6.4516 = 64.516 cm2
10 square inches = 64.516 square centimeters.
Conversion table
| Square inch (in2) | Square Centimeter (cm2) |
|---|---|
| 1 in2 | 6.4516 cm2 |
| 5 in2 | 32.258 cm2 |
| 10 in2 | 64.516 cm2 |
| 25 in2 | 161.29 cm2 |
| 50 in2 | 322.58 cm2 |
| 100 in2 | 645.16 cm2 |
Reverse conversion: Square Centimeter to Square inch
6.4516 cm2 × 0.15500031 = 1 in2
6.4516 square centimeters = 1 square inch.
square inches = square centimeters × 0.155000310001
For a page dedicated to this direction, see Square Centimeter to Square inch.
Understanding the Square inch (in2)
A square inch is the area of a one-inch square.
Understanding the Square Centimeter (cm2)
Square metric area unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many square centimeters are in 1 square inch?
1 square inch equals 6.4516 square centimeters, using the exact defined conversion factor rather than an estimate.
How do I convert square inch to square centimeter?
Multiply the square inch value by 6.4516. The converter above does this instantly to whatever precision you set.
How do I convert square centimeter back to square inch?
Use the reverse factor: 1 square centimeter equals 0.15500031 square inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a square inch?
Square inch (in2) is a unit of area.
What is a square centimeter?
Square Centimeter (cm2) is a unit of area.
Is the square inch to square centimeter conversion exact?
Yes. Both square inch and square centimeter are defined by fixed standards rather than physical artifacts, so the factor of 6.4516 used above is exact to as many digits as you choose to display.