Square metric area unit.
Square Centimeters to Square Millimeters Converter — cm2 to mm2
Convert Square Centimeter (cm2) to Square Millimeter (mm2) using the exact conversion factor (1 square centimeter = 100 square millimeter). See the formula, worked examples, and conversion table.
Square Centimeters to Square Millimeters converter
Converter
Area Converter
Convert land, construction, mapping, survey, and scientific area units.
Context values
Some unit families need one extra value for a physically accurate result.
Square metric area unit.
Result = input x 0.0001 / 1e-6.
Area uses the square meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Square Centimeters to Square Millimeters
Comparing Square Centimeter and Square Millimeter is common in agriculture and real estate, where US land is typically measured in acres and most of the rest of the world uses hectares. Both are square metric area unit units.
Formula
square millimeters = square centimeters × 100
This factor comes from each unit's defined relationship to the category's base unit: 1 square centimeter equals 0.0001 base units, and 1 square millimeter equals 0.000001 base units, so dividing one by the other gives the direct square centimeter-to-square millimeter factor of 100.
Simple example
1 cm2 × 100 = 100 mm2
1 square centimeter = 100 square millimeters.
Real-world example
10 cm2 × 100 = 1,000 mm2
10 square centimeters = 1,000 square millimeters.
Conversion table
| Square Centimeter (cm2) | Square Millimeter (mm2) |
|---|---|
| 1 cm2 | 100 mm2 |
| 5 cm2 | 500 mm2 |
| 10 cm2 | 1,000 mm2 |
| 25 cm2 | 2,500 mm2 |
| 50 cm2 | 5,000 mm2 |
| 100 cm2 | 10,000 mm2 |
Reverse conversion: Square Millimeter to Square Centimeter
100 mm2 × 0.01 = 1 cm2
100 square millimeters = 1 square centimeters.
square centimeters = square millimeters × 0.01
For a page dedicated to this direction, see Square Millimeter to Square Centimeter.
Understanding the Square Centimeter (cm2)
Square metric area unit.
Understanding the Square Millimeter (mm2)
Square metric area unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many square millimeters are in 1 square centimeter?
1 square centimeter equals 100 square millimeters, using the exact defined conversion factor rather than an estimate.
How do I convert square centimeter to square millimeter?
Multiply the square centimeter value by 100. The converter above does this instantly to whatever precision you set.
How do I convert square millimeter back to square centimeter?
Use the reverse factor: 1 square millimeter equals 0.01 square centimeters. You can also use the swap control in the converter above to flip the direction instantly.
What is a square centimeter?
Square Centimeter (cm2) is a unit of area.
What is a square millimeter?
Square Millimeter (mm2) is a unit of area.
Is the square centimeter to square millimeter conversion exact?
Yes. Both square centimeter and square millimeter are defined by fixed standards rather than physical artifacts, so the factor of 100 used above is exact to as many digits as you choose to display.