Convert Square Centimeters to Square Millimeters
1 square centimeter (cm²) equals 100 square millimeters (mm²).
1 cm² = 100 mm²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk square centimeter to square millimeter converter to paste a column from Excel.
How to Convert Square Centimeter to Square Millimeter
- 1 cm² = 100 mm²
- 1 mm² = 0.01 cm²
- Example: convert 15 cm² to mm²: 15 cm² = 15 × 100 mm² = 1500 mm²
Formula
mm² = cm² × 100
Derivation from SI units:
- 1 cm² = (0.01 m)² = 10⁻⁴ m²
- 1 mm² = (0.001 m)² = 10⁻⁶ m²
- 1 cm² = 0.0001 m² ÷ 0.000001 m² per mm² = 100 mm²
Both units are defined exactly, so the factor is exact. Square Centimeter definition: square centimeter; Square Millimeter definition: square millimeter.
Worked examples
- 1 cm² is 100 mm².
1 cm² × 100 = 100 mm² - A 5 cm² test head is 500 mm².
5 cm² × 100 = 500 mm²
Square Centimeter to Square Millimeter conversion table
| Square Centimeters (cm²) | Square Millimeters (mm²) |
|---|---|
| 1 cm² | 100 mm² |
| 2 cm² | 200 mm² |
| 5 cm² | 500 mm² |
| 6.45 cm² | 645 mm² |
| 10 cm² | 1000 mm² |
| 20 cm² | 2000 mm² |
| 25 cm² | 2500 mm² |
| 38.3 cm² | 3830 mm² |
| 50 cm² | 5000 mm² |
| 100 cm² | 10000 mm² |
| 200 cm² | 20000 mm² |
| 500 cm² | 50000 mm² |
| 929 cm² | 92900 mm² |
| 1000 cm² | 100000 mm² |
| 10000 cm² | 1000000 mm² |
Where it's used
Areas in cm² are converted to mm² for stress calculations in N/mm² and for small orifice and nozzle areas.
Square Centimeter to other area units
| Conversion | 1 cm² equals |
|---|---|
| square centimeter to square meter | 0.0001 m² |
| square centimeter to square millimeter | 100 mm² |
| square centimeter to square foot | 0.001076391042 ft² |
| square centimeter to square inch | 0.15500031 in² |
Frequently asked questions
How do I convert cm² to mm²?
Multiply by 100.
How many square millimeters are in 1 square centimeter?
1 cm² = 100 mm².
How do I convert square centimeters to square millimeters?
Multiply the value in cm² by 100. For example, 15 cm² × 100 = 1500 mm².
Is the cm² to mm² conversion exact?
Yes. Both units are defined exactly, and 1 cm² is exactly 100 mm².
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2 with SI prefix centi.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2 with SI prefix milli.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Square Centimeters to Square Millimeters. Retrieved October 17, 2026, from https://scientificconverters.com/area/square-centimeters-to-square-millimeters/
IEEE
Scientific Converters, "Convert Square Centimeters to Square Millimeters," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/area/square-centimeters-to-square-millimeters/