Square meters to square millimeters
Type a value in square meters to see it in square millimeters straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the square meters box.
- Read the result in square millimeters as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
mm² = m² × 1,000,000
Multiply the value in square meters by 1,000,000 to get square millimeters.
Example
To convert 25 m² to square millimeters: 25 × 1,000,000 = 25,000,000 mm².
Conversion table
| Square meters (m²) | Square millimeters (mm²) |
|---|---|
| 1 | 1,000,000 |
| 2 | 2,000,000 |
| 3 | 3,000,000 |
| 5 | 5,000,000 |
| 10 | 10,000,000 |
| 20 | 20,000,000 |
| 25 | 25,000,000 |
| 50 | 50,000,000 |
| 100 | 100,000,000 |
| 250 | 250,000,000 |
| 500 | 500,000,000 |
| 1,000 | 1,000,000,000 |
About the units
- Square meter
- The SI unit of area, equal to the area of a square with sides of one meter.
- Square millimeter
- A square millimeter is one millionth of a square meter, used for electrical cable cross sections.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many square millimeters are in one square meter?
1 m² = 1,000,000 mm² exactly.
How do I convert square meters to square millimeters?
Use mm² = m² × 1,000,000. For example, 25 m² = 25,000,000 mm².
How many square meters are in one square millimeter?
1 mm² = 0.000001 m².
How do I convert square meters to square feet?
Divide the square meters by 0.09290304, or multiply by about 10.7639. The factor is exact because a foot is exactly 0.3048 m.
Are the dunam, feddan and acre the same size?
No. A metric dunam is 1000 m², an Iraqi dunam 2500 m², an Egyptian feddan about 4200.83 m² and an acre 4046.8564224 m².