Convert square millimeters to square centimeters
1 mm² = 0.01 cm² — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
0.01cm²
As a fraction: 1/100
1 mm² = 0.01 cm²
How to convert square millimeters to square centimeters
Multiply the number of square millimeters by 0.01 to get square centimeters.
The exact factor is 0.01 — as a fraction, 1/100.
Square millimeter to Square centimeter conversion table
| Square millimeters (mm²) | Square centimeters (cm²) |
|---|---|
| 1 mm² | 0.01 |
| 2 mm² | 0.02 |
| 3 mm² | 0.03 |
| 5 mm² | 0.05 |
| 10 mm² | 0.1 |
| 20 mm² | 0.2 |
| 25 mm² | 0.25 |
| 50 mm² | 0.5 |
| 100 mm² | 1 |
| 250 mm² | 2.5 |
| 500 mm² | 5 |
| 1000 mm² | 10 |
Square centimeter to Square millimeter conversion table
| Square centimeters (cm²) | Square millimeters (mm²) |
|---|---|
| 1 cm² | 100 |
| 2 cm² | 200 |
| 3 cm² | 300 |
| 5 cm² | 500 |
| 10 cm² | 1000 |
| 20 cm² | 2000 |
| 25 cm² | 2500 |
| 50 cm² | 5000 |
| 100 cm² | 10 000 |
| 250 cm² | 25 000 |
| 500 cm² | 50 000 |
| 1000 cm² | 100 000 |
Frequently asked
How many square centimeters are in a square millimeter?
One square millimeter equals 0.01 square centimeters (mm² → cm²). That figure is exact, not rounded.
How do you convert square millimeters to square centimeters?
Multiply the number of square millimeters by 0.01 to get square centimeters.
What is 1 cm² in square millimeters?
One square centimeter is 100 square millimeters.
What is 10 mm² in cm²?
10 mm² = 0.1 cm².