Square centimeters to square inches

1 square centimeter = 0.155 square inches

Type a value in square centimeters (cm²) to get square inches (sq in) straight away. A square centimeter is smaller than a square inch, so the number goes down. Both units belong to area, measured here against the square meter.

FromTo0.15500031

1 cm² = 0.15500031 sq in

Formula

sq in = cm² × 0.15500031

One square centimeter is 0.15500031 square inches, so multiply by that factor. You can also divide by 6.4516, the number of square centimeters in one square inch. Here cm² is the value in square centimeters and sq in is the result in square inches.

Worked example: 500 square centimeters × 0.15500031 = 77.5002 square inches.

Square centimeters to square inches table

square centimeters (cm²)	square inches (sq in)
1 cm²	0.155 sq in
2 cm²	0.310001 sq in
3 cm²	0.465001 sq in
4 cm²	0.620001 sq in
5 cm²	0.775002 sq in
6 cm²	0.930002 sq in
7 cm²	1.085 sq in
8 cm²	1.24 sq in
9 cm²	1.395 sq in
10 cm²	1.55 sq in
15 cm²	2.325 sq in
20 cm²	3.10001 sq in
25 cm²	3.87501 sq in
30 cm²	4.65001 sq in
40 cm²	6.20001 sq in
50 cm²	7.75002 sq in
60 cm²	9.30002 sq in
75 cm²	11.625 sq in
100 cm²	15.5 sq in

Everyday square centimeters in square inches

What it is	cm²	sq in
a fingernail (about)	1 cm²	0.155 sq in
a credit card (about)	46 cm²	7.13001 sq in
a 10 × 10 cm tile	100 cm²	15.5 sq in
an A4 sheet	624 cm²	96.7202 sq in
one square meter	10,000 cm²	1,550 sq in

Quick estimate in your head

Multiply by about 0.16. For 500 cm² that gives 80 sq in against an exact 77.5002 sq in, an error of 3.2%.

About the units

Square centimeter (cm²). A square 1 cm on each side. Used for small surfaces like tiles and paper.

Square inch (sq in). A square 1 inch on each side, 6.4516 cm². Used for small surfaces and pressure units.

Going the other way, 1 square inch is 6.4516 square centimeters.

Questions

How many square inches are in 1 square centimeter?

1 square centimeter is 0.155 square inches, and 1 square inch is 6.4516 square centimeters.

How do I convert square centimeters to square inches?

Use sq in = cm² × 0.15500031. For example, 500 square centimeters × 0.15500031 = 77.5002 square inches.

Is the square centimeter to square inch factor exact?

The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.

How much is one square meter in square inches?

10,000 cm² is 1,550 sq in.

Source for the conversion factor: NIST Handbook 44, Appendix C (units of area).

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