Square Centimeters to Square Inches Converter

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Convert square centimeters to square inches using the squared linear factor: 1 inch = 2.54 cm, so 1 in² = 6.4516 cm² and 1 cm² ≈ 0.155 in². Anchors: 100 cm² ≈ 15.5 in², 1,000 cm² ≈ 155.0 in² (about 1 ft²). Useful for cross-section areas, packaging, photographic prints and printed-circuit-board pad sizes. Browser-local.

Square centimeter (cm²)
Square inch (in²)

Square centimeter (cm²) → Square inch (in²)

Quick reference table

Square centimeter (cm²)Square inch (in²)
1 cm²0.155 in²
2 cm²0.31 in²
5 cm²0.775 in²
10 cm²1.55 in²
25 cm²3.875 in²
50 cm²7.75 in²
100 cm²15.5 in²

Glossary

Square centimeter (cm²)

A square centimeter equals 100 mm² or 10⁻⁴ m². Used for cross-section areas in physics and chemistry, small object surfaces and packaging. Note that 1 m² = 10,000 cm² (not 100), because area scales as the square of the linear dimension. A standard credit card has an area of about 46 cm².

Square inch (in²)

A square inch is the area of a square one inch on each side, equal to exactly 0.00064516 m² (since 1 inch = 25.4 mm exactly). It is used in US engineering for cross-sections, packaging and small-component surface areas. 144 in² make one square foot; a standard US envelope flap is about 35 in².

Metric / SI area

In the metric system, area is reported in square meters (SI base) and its scaled units — square millimeter, square centimeter, square kilometer — plus the convenient hectare (10,000 m²) for land. Each step is exactly 100× the previous because area scales as the square of length: 1 m² = 100 dm² = 10,000 cm² = 1,000,000 mm². This squared scaling is the most common manual-conversion error.

Imperial / US Customary area

US customary and UK imperial systems use square inch, square foot, square yard, acre and square mile (144 in² = 1 ft², 9 ft² = 1 yd², 4,840 yd² = 1 acre, 640 acres = 1 mi²). The acre — historically the area a team of oxen could plow in a day — survives as the standard land-parcel unit in the US. Linked to metric by 1 ft² = 0.09290304 m² exactly.

Related tools

Square Inches to Square Centimeters
Convert in² to cm² — 1 in² = 6.4516 cm²
Square Centimeters to Square Meters
Convert cm² to m² — 10,000 cm² = 1 m² (not 100!)
Square Meters to Square Feet
Convert m² to ft² — 1 m² ≈ 10.764 ft²
Area Converter
Convert area — mm², cm², m², ha, km², in², ft², yd², acres, mi²