Convert Square centimetres to Square inches
1 square centimetre is 0.16 sq in. One square centimetre is exactly 0.155000310001 square inches.
One square centimetre is 0.15500031 square inches. To convert square centimetres to square inches, multiply by 0.15500031; to go the other way, divide by 0.15500031 or multiply by 6.4516. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Office of Weights and Measures. A ten-thousandth of a square metre — not a hundredth, which is the mistake squaring a prefix invites.
Factor checked against the defining standard · How we check
- Square centimetres × 0.15500031
1 * 0.15500030.155 sq in
1 square centimetre in every area unit
| Unit | Value | Exact factor |
|---|---|---|
| square inches | 0.15500031 sq in | × 0.155000310001 |
| square feet | 0.001076391042 sq ft | × 0.00107639104167 |
| square yards | 0.0001195990046 sq yd | × 0.00011959900463 |
| acres | 0.00000002471053815 ac | × 0.0000000247105381467 |
| square meters | 0.0001 m² | × 0.0001 |
| square millimetres | 100 mm² | × 100 |
| square centimetres (as entered) | 1 cm² | — |
| square kilometres | 0.0000000001 km² | × 0.0000000001 |
| square miles | 0.00000000003861021585 mi² | × 0.0000000000386102158542 |
| hectares | 0.00000001 ha | × 0.00000001 |
Factors are entered by hand from NIST Office of Weights and Measures rather than derived from a units library, so the ones that terminate are exact rather than rounded.
The same converter answers this pair however it is written: sqcm to sqin is how the symbols are typed on a keyboard with no superscript on it.
How do you convert square centimetres to square inches? The converter and the working
- 1.Take the measurement in square centimetres.
- 2.Multiply by 0.15500031 — that is how many square inches fit in one square centimetre.
- 3.To go back the other way, divide by 0.15500031, or multiply by 6.4516.
Worked example: 25 square centimetres to square inches
- Formula
- cm² × 0.15500031 = sq in
- Arithmetic
- 25 × 0.15500031 = 3.88 sq in
- Answer
- 25 cm² = 3.88 sq in
The factor is rounded for display; the figure above is computed from the full value.
Square centimetres to square inches conversion table
| Square centimetres | Square inches |
|---|---|
| 1 cm² | 0.16 sq in |
| 2 cm² | 0.31 sq in |
| 3 cm² | 0.47 sq in |
| 4 cm² | 0.62 sq in |
| 5 cm² | 0.78 sq in |
| 6 cm² | 0.93 sq in |
| 7 cm² | 1.09 sq in |
| 8 cm² | 1.24 sq in |
| 9 cm² | 1.4 sq in |
| 10 cm² | 1.55 sq in |
| 12 cm² | 1.86 sq in |
| 15 cm² | 2.33 sq in |
| 20 cm² | 3.1 sq in |
| 25 cm² | 3.88 sq in |
| 50 cm² | 7.75 sq in |
| 100 cm² | 15.5 sq in |
| 200 cm² | 31 sq in |
| 300 cm² | 46.5 sq in |
| 500 cm² | 77.5 sq in |
| 1000 cm² | 155 sq in |
| 2000 cm² | 310 sq in |
| 5000 cm² | 775 sq in |
| 10000 cm² | 1,550 sq in |
What is a square centimetre?
A ten-thousandth of a square metre — not a hundredth, which is the mistake squaring a prefix invites. 10,000 cm² to the square metre.
What is a square inch?
An inch on a side. 144 of them make a square foot.
How many square inches are in a square centimetre?
One square centimetre is 0.15500031 square inches. Going the other way, one square inch is 6.4516 square centimetres. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every area unit here
The whole group — 10 units with their symbols and the size of each one in square meters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a square centimetre.
Cite this page
- APA
- Rule Calculator. (2026). Convert Square centimetres to square inches. Rule Calculator. https://rulecalculators.com/convert/square-centimeter-to-square-inch
- MLA
- "Convert Square centimetres to square inches." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/square-centimeter-to-square-inch.
- Chicago
- Rule Calculator. "Convert Square centimetres to square inches." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/square-centimeter-to-square-inch.
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Questions people actually ask
- How many square inches are in a square centimetre?
- 0.15500031. An inch on a side. 144 of them make a square foot.
- How do I convert square inches back to square centimetres?
- Divide by 0.15500031, or multiply by 6.4516 — they are the same operation.
Other area conversions
Square inches to square centimetres — the same conversion the other way.