Convert square centimeter to square inch
Convert square centimeter to square inch instantly. 1 cm² = 0.155 in². Formula, worked examples and a quick reference table.
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One square centimeter equals 0.155 square inches. To convert any number of square centimeters to square inches, multiply by 0.15500031.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Area conversions carry a trap that catches people who are perfectly comfortable with length: the factor is squared. There are 3.28 feet in a metre but 10.76 square feet in a square metre, and using the linear factor is the most common error in property arithmetic. Beyond that, land is measured in whatever the local convention prescribes — acres, hectares, and across South Asia bigha, katha and gaj — so the same plot is routinely described in two units that need reconciling.
square centimeter to square inch formula
To go the other way, use square centimeter = square inch ÷ 0.15500031.
About these units
The square centimetre is a ten-thousandth of a square metre — the scale of a stamp or a screen sensor, and common in engineering cross-sections.
The square inch is the area unit behind pounds per square inch. There are exactly 6.4516 square centimetres in one.
Square Centimeter is also written square centimetre, sq cm, cm2 and cm^2. Square Inch is also written square inches, sq in and in2.
Sources
square centimeter to square inch conversion table
| Square Centimeter | Square Inch |
|---|---|
| 1 cm² | 0.155 in² |
| 2 cm² | 0.31 in² |
| 3 cm² | 0.465 in² |
| 5 cm² | 0.775 in² |
| 10 cm² | 1.55 in² |
| 20 cm² | 3.1 in² |
| 25 cm² | 3.875 in² |
| 50 cm² | 7.75 in² |
| 100 cm² | 15.5 in² |
| 250 cm² | 38.7501 in² |
| 500 cm² | 77.5002 in² |
| 1,000 cm² | 155.0003 in² |
Frequently asked questions
How many square inches are in a square centimeter? +
There are 0.155 square inches in one square centimeter.
What is 10 cm² in in²? +
10 cm² equals 1.55 in². Multiply 10 by 0.15500031.
How do I convert square inch back to square centimeter? +
Use square centimeter = square inch ÷ 0.15500031. The converter above handles both directions, or see our dedicated square inch to square centimeter page.
How accurate is this square centimeter to square inch conversion? +
The factor used is 0.15500031, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate cm² to in² in my head? +
Divide by 6.45. That reproduces the exact factor of 0.155 to the precision you could read off a result anyway.