Convert Square Centimeter to Square Inch (cm² → in²)
The square centimeter is used in engineering tolerances, biology specimen measurements, and small-area calculations.
Square Centimeter to Square Inch Conversion Table
10 common values| Square Centimeter | Square Inch |
|---|---|
| 1 cm² | 0.155 in² |
| 5 cm² | 0.775002 in² |
| 10 cm² | 1.550003 in² |
| 50 cm² | 7.750016 in² |
| 100 cm² | 15.500031 in² |
| 500 cm² | 77.500155 in² |
| 1,000 cm² | 155.00031 in² |
| 5,000 cm² | 775.00155 in² |
| 10,000 cm² | 1,550.0031 in² |
| 50,000 cm² | 7,750.0155 in² |
How to Convert Square Centimeter to Square Inch Manually
Step by StepConverting square centimeters to square inches is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in square centimetersStart with the number of square centimeters (cm²) you want to convert.
- 2Multiply by 0.155The conversion factor from cm² to in² is 0.155. Multiply your value by this number.
- 3Read the result in square inchesThe result is your value in square inches (in²).
Formula
Multiply the value in square centimeters by 0.155. For the reverse direction, multiply by 6.4516.
in² = cm² × 0.155cm² = in² × 6.4516Tips
Use these in everyday conversions- 1 cm² = 100 mm² = 10⁻⁴ m² = 0.155 in².
- A square 1 cm on each side contains 1 cm².
- For large areas switch to m² or km² early.
Common Mistakes
Avoid these- Reading cm² as cm in specifications — off by factor involving the length.
- Confusing with cc (cubic centimetre, a volume unit).
- Assuming cm² and m² are comparable by simple 100 factor — it is 10,000.
About Square Centimeter and Square Inch
What is the Square Centimeter?
The square centimeter equals one ten-thousandth of a square meter (1/10,000 m² = 0.0001 m²) and is the everyday metric unit for small areas: cross-sections in engineering, biological specimen surfaces, fabric patterns, and skin surface area in medicine. Burn-injury severity is often described as a percentage of total body surface area, but specific lesions are measured in cm². Small mechanical components, electronic-circuit footprints, and laboratory specimens routinely use square centimeters. The square centimeter relates to the square millimeter (1 cm² = 100 mm²), the square meter (10,000 cm² = 1 m²), and the square inch (1 cm² ≈ 0.155 in²). Dressmaking patterns, photographic-print sizes, and architectural drawing details use cm² for area calculations.
- Paper and printing sizes
- Biology — leaf, skin or tissue area
- Small-item packaging specs
An A4 sheet is 623.7 cm². A postage stamp is typically 5–8 cm². A credit card is about 46 cm².
What is the Square Inch?
The square inch equals exactly 6.4516 square centimeters and is the American precision unit for printer paper coverage, manufacturing tolerances, and small-area calculations. Pressure in the US is measured in pounds per square inch (psi), so the unit is essential in engineering and tire-pressure ratings. Computer screens are sometimes specified by total viewable square inches. The square inch relates to the square foot (144 in² = 1 ft²), the square centimeter (1 in² = 6.4516 cm²), the square millimeter (1 in² ≈ 645.16 mm²), and the square meter (1 in² ≈ 0.000645 m²). Postage-stamp areas, electronic-circuit board details, and machined-part tolerances all use square inches in American engineering practice.
- US machine engineering and drawings
- Tile, flooring and surface specifications
- Pressure units (PSI) base area
A US letter page is 93.5 in². A common US tile is 144 in² (1 ft²). Credit card ≈ 7.1 in².