Convert square millimeters (mm²) to square inches (in²) with formulas, examples, and conversion tables.
To convert 1 square millimeters to square inches, we divide by 645.16 because one square inch equals exactly 645.16 square millimeters.
Since there are 645.16 square millimeters in every square inch, we divide our value by this factor:
So 1 square millimeters = 0.00155 square inches.
To convert square millimeters to square inches, divide the value by 645.16.
1 square inch = 645.16 square millimeters
| Square Millimeters | Square Inches |
|---|---|
| 1 mm² | 0.00155 in² |
| 2 mm² | 0.0031 in² |
| 5 mm² | 0.00775 in² |
| 10 mm² | 0.0155 in² |
| 20 mm² | 0.031 in² |
| 25 mm² | 0.03875 in² |
| 50 mm² | 0.0775 in² |
| 100 mm² | 0.155 in² |
| 250 mm² | 0.3875 in² |
| 500 mm² | 0.775 in² |
| 1000 mm² | 1.55 in² |
| Unit | 1 mm² = |
|---|---|
| Square Millimeters to Square Kilometers | 1e-12 km² |
| Square Millimeters to Hectares | 1e-10 ha |
| Square Millimeters to Square Meters | 0.000001 m² |
| Square Millimeters to Square Centimeters | 0.01 cm² |
| Square Millimeters to Square Miles | 3.861e-13 mi² |
| Square Millimeters to Acres | 2.4711e-10 ac |
| Square Millimeters to Square Yards | 0.0000012 yd² |
| Square Millimeters to Square Feet | 0.00001076 ft² |
| Square Millimeters to Square Inches | 0.00155 in² |
| Square Millimeters to Ares | 1e-8 a |
| Square Millimeters to Barns | 1e+22 b |