Square Millimeters to Square Inches Converter
Convert square millimeters (mm²) to square inches (in²)
Result
0.0015500031 in²
Square Inches
1 mm² = 0.0015500031 in²
1 mm² in other units
- 1Enter a valueType the number to convert
- 2Pick the unitsChoose what to convert from and to
- 3Read the resultSee it in every other unit too
How to convert square millimeters to square inches
One square millimeter equals 0.001550003 square inches, so multiply the number of square millimeters by 0.001550003.
in² = mm² × 0.001550003
1 mm² = 0.001550003 in² · 1 in² = 645.16 mm²
Worked example
To convert 5 square millimeters to square inches: 5 mm² × 0.001550003 = 0.007750016 in².
About square millimeters (mm²)
A square millimetre is the area of a 1 mm × 1 mm square, used for wire cross-sections and small parts.
About square inches (in²)
A square inch is the area of a 1 in × 1 in square, exactly 6.4516 cm².
More conversions
Square Millimeters to other units
- Square Millimeters to Square Centimeters
- Square Millimeters to Square Meters
- Square Millimeters to Square Kilometers
- Square Millimeters to Hectares
- Square Millimeters to Square Feet
- Square Millimeters to Square Yards
- Square Millimeters to Cents
- Square Millimeters to Guntha
- Square Millimeters to Acres
- Square Millimeters to Square Miles
Other units to Square Inches
Frequently asked questions
How many square inches are in one square millimeter?
One square millimeter equals 0.001550003 square inches.
How many square millimeters are in one square inch?
One square inch equals 645.16 square millimeters.
How do I convert square millimeters to square inches?
Use the formula in² = mm² × 0.001550003. For example, 5 mm² × 0.001550003 = 0.007750016 in².