How to convert square centimeters to square millimeters
mm² = cm² × 100Multiply the value in square centimeters by 100. To go the other way, multiply by 0.01 (or divide by 100).
A square centimeter is larger than a square millimeter: one square centimeter contains 100 square millimeters.
Worked examples
- 1 square centimeter1 cm² × 100 = 100 mm²
- 5 square centimeters5 cm² × 100 = 500 mm²
- 10 square centimeters10 cm² × 100 = 1,000 mm²
- 20 square centimeters20 cm² × 100 = 2,000 mm²
- 100 square centimeters100 cm² × 100 = 10,000 mm²
Square centimeters to square millimeters conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Square centimeters (cm²) | Square millimeters (mm²) |
|---|---|
| 0.1 cm² | 10 mm² |
| 0.25 cm² | 25 mm² |
| 0.5 cm² | 50 mm² |
| 1 cm² | 100 mm² |
| 2 cm² | 200 mm² |
| 3 cm² | 300 mm² |
| 4 cm² | 400 mm² |
| 5 cm² | 500 mm² |
| 6 cm² | 600 mm² |
| 7 cm² | 700 mm² |
| 8 cm² | 800 mm² |
| 9 cm² | 900 mm² |
| 10 cm² | 1,000 mm² |
| Square centimeters (cm²) | Square millimeters (mm²) |
|---|---|
| 12 cm² | 1,200 mm² |
| 15 cm² | 1,500 mm² |
| 20 cm² | 2,000 mm² |
| 25 cm² | 2,500 mm² |
| 30 cm² | 3,000 mm² |
| 40 cm² | 4,000 mm² |
| 50 cm² | 5,000 mm² |
| 75 cm² | 7,500 mm² |
| 100 cm² | 10,000 mm² |
| 250 cm² | 25,000 mm² |
| 500 cm² | 50,000 mm² |
| 1,000 cm² | 100,000 mm² |
About the units
Square centimeter (cm²)
The square centimeter (cm²) is a unit of area in the International System of Units (SI). One square centimeter equals 0.0001 square meters (m²).
Square millimeter (mm²)
Used for wire cross-sections in metric countries (e.g. 2.5 mm² cable). One square millimeter equals 0.000001 square meters (m²).
Frequently asked questions
How many square millimeters are in one square centimeter?
There are 100 square millimeters in one square centimeter, and this value is exact by definition.
How do I convert square centimeters to square millimeters?
Multiply the number of square centimeters by 100. For example, 10 cm² × 100 = 1,000 mm².
How many square centimeters are in one square millimeter?
One square millimeter equals 0.01 square centimeters. That is the reverse factor, 1 ÷ 100.
What is 10 square centimeters in square millimeters?
10 cm² = 1,000 mm².
Is this cm² to mm² converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.
Convert square centimeters to other units
- Square centimeters to square meters
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