mm² to in²
39 unitsResult1.550003e-3
0.0015500031in²
1 mm² × 0.0015500031 = 0.0015500031 in²
Convert Square millimeter to Square inch (mm² to in²)
1 square millimeter = 0.0015500031 square inch. Convert square millimeters to square inch instantly, with the exact factor, the formula and a reference table of common values.
Formula
square inch = square millimeters × 0.0015500031
mm² to in² conversion table
| mm² | in² |
|---|---|
| 1 mm² | 0.0015500031 in² |
| 2 mm² | 0.0031000062 in² |
| 3 mm² | 0.0046500093 in² |
| 5 mm² | 0.0077500155 in² |
| 10 mm² | 0.015500031 in² |
| 20 mm² | 0.031000062 in² |
| 50 mm² | 0.077500155 in² |
| 100 mm² | 0.15500031 in² |
| 250 mm² | 0.387500775 in² |
| 500 mm² | 0.77500155 in² |
| 1000 mm² | 1.5500031 in² |
What is a square millimeter?
A square millimeter is a tiny square one millimeter on each side; a million of them make one square meter. It is about the size of a pinhead.
Engineers and machinists use it for wire cross-sections, small components and tolerances, and biologists use it under the microscope.
In writing, the square millimeter is usually shortened to "mm²". One square millimeter is 0.000001 square meters, and that ratio is what every number on this page is built from.