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Area
Square centimeters to Square inches
Convert square centimeters (cm²) to square inches (in²). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 cm² = 0.155 in²
Square centimeters to Square inches Conversion Table
Common values, ready to copy:
| square centimeters | square inches |
|---|---|
| 1 cm² | 0.155 in² |
| 2 cm² | 0.310001 in² |
| 5 cm² | 0.775002 in² |
| 10 cm² | 1.55 in² |
| 25 cm² | 3.875 in² |
| 50 cm² | 7.75 in² |
| 100 cm² | 15.5 in² |
| 1,000 cm² | 155 in² |
Formula
square inches = square centimeters × 1.55000310e-1
Area conversions are derived from length: 1 ft² = (0.3048 m)² = 0.092903 m². 1 acre = 4,046.86 m². 1 hectare = 10,000 m² exactly.
About Square centimeters and Square inches
Square centimeters (cm²): One centimeter squared, 100 mm² or 1/10,000 of a square meter; convenient unit for small flat areas. Common uses: Surface area of phone screens and other small displays, fabric scraps, and laboratory work.
Square inches (in²): One inch squared, or 6.4516 cm² exactly (since the inch is defined as 2.54 cm exactly). Common uses: Small flat areas in US contexts — phone screens, computer chip die sizes, postal stamps, and small fabricated parts.
How the conversion works
Area conversions are derived from length: 1 ft² = (0.3048 m)² = 0.092903 m². 1 acre = 4,046.86 m². 1 hectare = 10,000 m² exactly.
The exact relationship is square inches = square centimeters × 1.55000310e-1, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between square centimeters and square inches comes up wherever area measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.