Square Inches to Square Centimeters Converter
Convert square inches to square centimeters instantly. One square inch equals exactly 6.4516 square centimeters. Type in either box to convert both ways, then use the chart, worked examples and everyday sizes below.
How to convert square inches to square centimeters
Worked example: convert 48 square inches to square centimeters. Using square centimeters ← square inches × 6.4516, we get 48 × 6.4516 = 309.6768 cm². To check the result, convert back: 309.6768 cm² ÷ 6.4516 = 48 sq in.
Square inches to square centimeters chart
| Square inches (sq in) | Square centimeters (cm²) |
|---|---|
| 1 sq in | 6.4516 cm² |
| 2 sq in | 12.9032 cm² |
| 3 sq in | 19.3548 cm² |
| 4 sq in | 25.8064 cm² |
| 5 sq in | 32.258 cm² |
| 6 sq in | 38.7096 cm² |
| 8 sq in | 51.6128 cm² |
| 10 sq in | 64.516 cm² |
| 12 sq in | 77.4192 cm² |
| 15 sq in | 96.774 cm² |
| 20 sq in | 129.032 cm² |
| 25 sq in | 161.29 cm² |
| 30 sq in | 193.548 cm² |
| 40 sq in | 258.064 cm² |
| 50 sq in | 322.58 cm² |
| 75 sq in | 483.87 cm² |
| 100 sq in | 645.16 cm² |
| 150 sq in | 967.74 cm² |
| 200 sq in | 1,290.32 cm² |
| 250 sq in | 1,612.9 cm² |
| 500 sq in | 3,225.8 cm² |
| 1,000 sq in | 6,451.6 cm² |
Square centimeters to square inches (reverse)
| Square centimeters (cm²) | Square inches (sq in) |
|---|---|
| 1 cm² | 0.1550003 sq in |
| 2 cm² | 0.3100006 sq in |
| 5 cm² | 0.7750016 sq in |
| 10 cm² | 1.550003 sq in |
| 20 cm² | 3.100006 sq in |
| 50 cm² | 7.750016 sq in |
| 100 cm² | 15.50003 sq in |
| 250 cm² | 38.75008 sq in |
| 500 cm² | 77.50016 sq in |
| 1,000 cm² | 155.0003 sq in |
About the square inch and the square centimeter
A square inch is the area of a square with 1-inch sides. It appears in pressure units like psi (pounds per square inch), print and screen sizes, and small parts.
A square centimeter is a 1 cm by 1 cm square. It is used for paper and card sizes, small surfaces, skin areas in medicine and the cross section of wires.
One square inch equals 6.4516 square centimeters, which makes the square inch the larger unit of the two.
Everyday sizes in square inches and square centimeters
| Everyday example (approximate) | In square inches | In square centimeters |
|---|---|---|
| A bedroom | 18,600 sq in | 120,000 cm² |
| A parking space | 19,375 sq in | 125,000 cm² |
| A one-bedroom apartment | 77,500 sq in | 500,000 cm² |
| A tennis court | 404,180 sq in | 2,607,600 cm² |
| A basketball court | 676,730 sq in | 4,366,000 cm² |
| A soccer pitch | 11,067,000 sq in | 71,400,000 cm² |
Square inches to square centimeters FAQ
How many square centimeters are in one square inch?
One square inch equals exactly 6.4516 square centimeters. In the other direction, one square centimeter equals 0.15500031 square inches.
How do I convert square inches to square centimeters without a calculator?
convert 48 square inches to square centimeters. Using square centimeters ← square inches × 6.4516, we get 48 × 6.4516 = 309.6768 cm². To check the result, convert back: 309.6768 cm² ÷ 6.4516 = 48 sq in. For a quick estimate, round the factor to 6.5. Then 48 sq in is about 312 cm², compared with the exact 309.677 cm² (an error of 0.75%). That is close enough for planning, but use the calculator above when the number matters.
What is a basketball court in square centimeters?
A basketball court is about 676,730 square inches, which is 4,366,000 square centimeters. Treat that as an approximate everyday figure rather than an official measurement.
Are the square inches and square centimeters the same in every country?
The square inch is exactly 6.4516 cm². The square centimeter is exactly 0.0001 m².