Convert square millimeters to square centimeters
1 mm² = 0.01 cm². Change the amount below, or read the formula and the reference table further down.
1 square millimeter equals
square centimeters
1 mm² = 0.01 cm²
The formula
Square millimeters and square centimeters both measure area from the same zero, so a single multiplier does the job.
cm² = mm² × 0.01
Going the other way? Convert square centimeters to square millimeters.
Square millimeters to square centimeters table
Common values, rounded for reading.
| Square millimeters (mm²) | Square centimeters (cm²) |
|---|---|
| 1 | 0.01 |
| 2 | 0.02 |
| 3 | 0.03 |
| 4 | 0.04 |
| 5 | 0.05 |
| 6 | 0.06 |
| 7 | 0.07 |
| 8 | 0.08 |
| 9 | 0.09 |
| 10 | 0.1 |
| 15 | 0.15 |
| 20 | 0.2 |
| 25 | 0.25 |
| 30 | 0.3 |
| 40 | 0.4 |
| 50 | 0.5 |
| 75 | 0.75 |
| 100 | 1 |
| 250 | 2.5 |
| 500 | 5 |
| 1,000 | 10 |
Questions people ask
- How many square centimeters are in a square millimeter?
- One square millimeter equals 0.01 square centimeters.
- How do I convert square millimeters to square centimeters by hand?
- Multiply the number of square millimeters by 0.01. For a rough check, 0.01 is close enough for most everyday use.
- What is 1 square millimeter in square centimeters?
- 1 square millimeter is 0.01 square centimeters.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.