Convert Square Millimeters to Square Centimeters
1 square millimeter (mm²) equals 0.01 square centimeters (cm²).
1 mm² = 0.01 cm²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk square millimeter to square centimeter converter to paste a column from Excel.
How to Convert Square Millimeter to Square Centimeter
- 1 mm² = 0.01 cm²
- 1 cm² = 100 mm²
- Example: convert 15 mm² to cm²: 15 mm² = 15 × 0.01 cm² = 0.15 cm²
Formula
cm² = mm² ÷ 100
Derivation from SI units:
- 1 mm² = (0.001 m)² = 10⁻⁶ m²
- 1 cm² = (0.01 m)² = 10⁻⁴ m²
- 1 mm² = 0.000001 m² ÷ 0.0001 m² per cm² = 0.01 cm²
Both units are defined exactly, so the factor is exact. Square Millimeter definition: square millimeter; Square Centimeter definition: square centimeter.
Worked examples
- 100 mm² is 1 cm².
100 mm² × 0.01 = 1 cm² - A 50 mm² cable cross-section is 0.5 cm².
50 mm² × 0.01 = 0.5 cm²
Square Millimeter to Square Centimeter conversion table
| Square Millimeters (mm²) | Square Centimeters (cm²) |
|---|---|
| 0.5 mm² | 0.005 cm² |
| 0.75 mm² | 0.0075 cm² |
| 1 mm² | 0.01 cm² |
| 1.5 mm² | 0.015 cm² |
| 2.5 mm² | 0.025 cm² |
| 4 mm² | 0.04 cm² |
| 6 mm² | 0.06 cm² |
| 10 mm² | 0.1 cm² |
| 16 mm² | 0.16 cm² |
| 25 mm² | 0.25 cm² |
| 35 mm² | 0.35 cm² |
| 50 mm² | 0.5 cm² |
| 70 mm² | 0.7 cm² |
| 95 mm² | 0.95 cm² |
| 100 mm² | 1 cm² |
| 500 mm² | 5 cm² |
| 645.16 mm² | 6.4516 cm² |
| 1000 mm² | 10 cm² |
Where it's used
Areas in mm² are converted to cm² when switching between drawing and sample-size conventions.
Square Millimeter to other area units
| Conversion | 1 mm² equals |
|---|---|
| square millimeter to square meter | 0.000001 m² |
| square millimeter to square centimeter | 0.01 cm² |
| square millimeter to square foot | 0.00001076391042 ft² |
| square millimeter to square inch | 0.0015500031 in² |
Frequently asked questions
How many mm² are in a cm²?
Exactly 100.
How many square centimeters are in 1 square millimeter?
1 mm² = 0.01 cm².
How do I convert square millimeters to square centimeters?
Multiply the value in mm² by 0.01, or divide it by 100. For example, 15 mm² × 0.01 = 0.15 cm².
Is the mm² to cm² conversion exact?
Yes. Both units are defined exactly, and 1 mm² is exactly 0.01 cm².
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2 with SI prefix milli.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2 with SI prefix centi.
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 Millimeters to Square Centimeters. Retrieved October 17, 2026, from https://scientificconverters.com/area/square-millimeters-to-square-centimeters/
IEEE
Scientific Converters, "Convert Square Millimeters to Square Centimeters," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/area/square-millimeters-to-square-centimeters/