To convert square millimeters to square inches, multiply the value by 0.00155. To go the other way, multiply square inches by 645.16 to get square millimeters.
| Square Millimeters (mm²) | Square Inches (in²) |
|---|---|
| 1 mm² | 0.00155 in² |
| 2 mm² | 0.00310001 in² |
| 5 mm² | 0.00775002 in² |
| 10 mm² | 0.0155 in² |
| 20 mm² | 0.0310001 in² |
| 50 mm² | 0.0775002 in² |
| 100 mm² | 0.155 in² |
| 500 mm² | 0.775002 in² |
| 1,000 mm² | 1.55 in² |
Square millimeter (mm²). A square millimeter is the area of a square with 1 mm sides, used for small parts, wire and pipe cross-sections.
Square inch (in²). A square inch is the area of a square with 1-inch sides (6.4516 cm²).
There are 0.00155 square inches in one square millimeter.
Multiply the number of square millimeters by 0.00155. For example, 10 square millimeters equal 0.0155 square inches.
One square inch equals 645.16 square millimeters.