Convert Square Centimeters (cm²) to Square Inches (in²)
1 square centimeter equals 0.155 square inches.
Square Centimeter to Square Inch Converter
How to Convert Square Centimeter to Square Inch
1 square centimeter = 0.155 square inches exact
Square Inch = Square Centimeter × 0.155
Example: 1 cm² × 0.155 = 0.155 in²
Reverse Conversion
To convert square inches back to square centimeters:
- Remember, 1 square inch equals 6.4516 square centimeters.
- To convert 0.155 in² to cm², multiply
0.155 x 6.4516, resulting in1 cm².
exact This conversion factor is exact by international definition.
Common Square Centimeter to Square Inch Conversions
| Square Centimeter | Square Inch | Actions |
|---|---|---|
| 1 square centimeter | 0.155 square inches | |
| 5 square centimeters | 0.775002 square inches | |
| 10 square centimeters | 1.55 square inches |
| Square Centimeter | Square Inch | Actions |
|---|---|---|
| 50 square centimeters | 7.75002 square inches | |
| 100 square centimeters | 15.5 square inches |
Square centimeters to square inches Conversion Table
Reference table with common square centimeters to square inches conversions. All values calculated with high precision.
Square Centimeters to Square Inches Table
0.001 to 5
Square Centimeters to Square Inches Table
10 to 1000000
Square Inches to Square Centimeters Table
0.0001 to 12
Square Inches to Square Centimeters Table
1 to 100000
Definition of Square Centimeter
- Definition
-
cm² — The square centimeter is an SI-derived unit of area equal to exactly 0.0001 m² (one ten-thousandth of a square meter). It represents the area of a square with sides of 1 centimeter.
The square centimeter is widely used in science, engineering, medicine, and manufacturing to express small surface areas such as cross-sections, skin lesions, sensor surfaces, and component footprints.
Because the centimeter is a decimal submultiple of the meter (1 cm = 0.01 m), all conversions between cm² and m² are exact powers of ten, making the square centimeter convenient for precise metric calculations.
- Exact factor
- 1 cm² = 0.0001 m²
- Examples
-
- 1.2 cm² = 0.00012 m²
- 73,000 cm² = 7.3 m²
- 6.8 cm² = 1.054 in²
Definition of Square Inch
- Definition
-
in² — The square inch is a unit of area in the US customary and British imperial systems. It is defined as the area of a square with sides of exactly 1 inch (25.4 mm), giving it an exact metric value of 6.4516 cm².
The square inch is commonly used in the United States and the United Kingdom for expressing small areas in engineering, manufacturing, printing, and electronics — for example, display resolution (pixels per square inch) and material pressure ratings.
Since the international inch is defined as exactly 25.4 millimeters, the conversion factor 1 in² = 6.4516 cm² = 0.00064516 m² is exact and normative per NIST SP 811.
- Exact factor
- 1 in² = 6.4516 cm²
- Examples
-
- 336 in² = 2.3333 ft²
- 3,240 in² = 22.5 ft²
- 67,000 in² = 0.01068 ac
About the Square Centimeter
Facts & Uses
- 1 cm² = 0.0001 m² exactly. The practical unit for small areas in laboratory work, electronics, and product specifications.
- Standard for cross-sections in physiology (muscle, organ areas), microscopy fields, and printed circuit boards.
- Used in cloth and leather measurements for sample sizes, wound care (dressing sizes), and burn assessment (Body Surface Area in cm²).
- Convenient for density per area calculations: g/cm² for surface density, drops/cm² for paint coverage, lux for illumination intensity.
Curiosities
- A standard postage stamp is approximately 6 cm² (2 × 3 cm); a credit card is about 46 cm² (5.4 × 8.5 cm); an iPhone screen is around 90-110 cm².
- The palm of an adult hand covers approximately 1% of body surface area (~150 cm²) — used in burn triage as the "rule of palm".
- The Burgers vector in materials science and many physics quantities use cm² because it bridges the macroscopic and molecular scales.
- Approximate equivalents: 1 cm² ≈ 0.155 in²; 100 cm² = 1 dm² = 0.01 m².
Sources
About the Square Inch
Facts & Uses
- 1 in² = 645.16 mm² exactly = 6.4516 cm². Standard for small US/UK measurements: hardware, electronics, and printed materials.
- Used in tile and flooring in the US (sq inches per tile), printing (ad pricing per column-inch), and circuit boards (BGA pad areas).
- Foundation of psi (pounds per square inch) — the dominant US pressure unit, derived from force divided by area.
- Common in hardware specs: bolt cross-sections, gasket areas, and material data sheets in US engineering.
Curiosities
- A US postage stamp is approximately 1 in² (about 0.85 in × 1 in); a quarter coin is about 0.74 in² in face area.
- Tablet and phone screens are commonly specified by diagonal in inches, but display area in square inches is the more relevant metric for content.
- The square inch is exactly 645.16 mm² because the inch is defined as exactly 25.4 mm — making the conversion lossless and traceable to the SI.
- Approximate equivalents: 1 in² = 6.4516 cm² ≈ 0.0069 ft²; 144 in² = 1 ft².
Sources
Frequently Asked Questions
How many square inches are in one square centimeter?
One square centimeter equals 0.155 square inches. To convert, multiply the square centimeter value by 0.155. For the reverse, divide the square inch value by 0.155 (or multiply by 6.4516).
What is 660 square centimeters in square inches?
660 square centimeters = 102.3 square inches. This is one of the most commonly searched conversions for this pair.
Is the square centimeter-to-square inch conversion exact?
Yes. The factor 0.155 is exact by international definition, not an approximation. Any imprecision comes only from the original measurement, not the conversion.
Looking for the reverse? Convert Square Inch to Square Centimeter
