Square millimetres to Square centimetres
Type a value in Square millimetres and get the result in Square centimetres, calculated exactly.
50 Square millimetres = 0.5 Square centimetres
Precision
Exact factorThis result is exact.
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Formula
cm² = mm² × 0.01
To convert Square millimetres to Square centimetres, multiply the value by 0.01.
Worked examples
- 1 mm² × 0.01 = 0.01 cm²
- 50 mm² × 0.01 = 0.5 cm²
- 100 mm² × 0.01 = 1 cm²
This factor is exact by definition.
Conversion table
| Square millimetres (mm²) | Square centimetres (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 |
| 60 | 0.6 |
| 70 | 0.7 |
| 75 | 0.75 |
| 80 | 0.8 |
| 90 | 0.9 |
| 100 | 1 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Square centimetres to Square millimetres
| Square centimetres (cm²) | Square millimetres (mm²) |
|---|---|
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
| 4 | 400 |
| 5 | 500 |
| 6 | 600 |
| 7 | 700 |
| 8 | 800 |
| 9 | 900 |
| 10 | 1,000 |
| 15 | 1,500 |
| 20 | 2,000 |
| 25 | 2,500 |
| 30 | 3,000 |
| 40 | 4,000 |
| 50 | 5,000 |
| 60 | 6,000 |
| 70 | 7,000 |
| 75 | 7,500 |
| 80 | 8,000 |
| 90 | 9,000 |
| 100 | 10,000 |
Unit definitions
- Square millimetres mm²
- A square one millimetre on each side: one millionth of a square metre.
- Square centimetres cm²
- A square one centimetre on each side: 0.0001 square metres.
Questions people ask
Square millimetres to Square centimetres: what is the conversion factor?
One mm² is 0.01 cm².
How do I convert Square millimetres to Square centimetres?
Use the formula above. For example, 50 mm² = 0.5 cm².
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.