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Area
Square centimeters to Square millimeters
Convert square centimeters (cm²) to square millimeters (mm²). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 cm² = 100 mm²
Square centimeters to Square millimeters Conversion Table
Common values, ready to copy:
| square centimeters | square millimeters |
|---|---|
| 1 cm² | 100 mm² |
| 2 cm² | 200 mm² |
| 5 cm² | 500 mm² |
| 10 cm² | 1000 mm² |
| 25 cm² | 2500 mm² |
| 50 cm² | 5000 mm² |
| 100 cm² | 10000 mm² |
| 1,000 cm² | 100000 mm² |
Formula
square millimeters = square centimeters × 1.00000000e+2
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 millimeters
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 millimeters (mm²): One millimeter squared; useful for small areas like wire cross-sections (in mm²) and circuit board features. Common uses: Electrical engineering (wire gauge in mm²), manufacturing tolerances, 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 millimeters = square centimeters × 1.00000000e+2, 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 millimeters 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.