Square Millimeter to Square Inch Converter

1 mm² = 0.0015500031 in²

01

FORMULA

1 mm² = 0.0015500031 in²
02

CONVERSION TABLE

Square Millimeter (mm²) Square Inch (in²)
1 mm² 0.0015500031 in²
5 mm² 0.0077500155 in²
10 mm² 0.0155 in²
25 mm² 0.03875 in²
50 mm² 0.0775 in²
100 mm² 0.155 in²
250 mm² 0.387501 in²
500 mm² 0.775002 in²
1,000 mm² 1.55 in²
Square Inch to Square Millimeter
03

COMMON VALUES

1 mm²
= 0.0015500031 in²
2 mm²
= 0.0031000062 in²
3 mm²
= 0.0046500093 in²
5 mm²
= 0.0077500155 in²
10 mm²
= 0.0155 in²
15 mm²
= 0.02325 in²
20 mm²
= 0.031 in²
25 mm²
= 0.03875 in²
30 mm²
= 0.0465 in²
50 mm²
= 0.0775 in²
75 mm²
= 0.11625 in²
100 mm²
= 0.155 in²
04

RELATED CONVERSIONS

Square Meter → Square Foot Square Foot → Square Meter Acre → Hectare Hectare → Acre Square Kilometer → Square Mile Square Mile → Square Kilometer Square Meter → Acre Acre → Square Meter Square Foot → Square Yard Square Yard → Square Foot

About Square Millimeter (mm²)

One millionth of a square meter, the square millimeter is used in electrical engineering for wire cross-sectional area (e.g., 2.5 mm-squared cable), precision machining tolerances, and microscopy field measurements. Electrical cables in metric countries are specified by their cross-section in square millimeters.

About Square Inch (in²)

One 144th of a square foot (approximately 6.452 square centimeters), the square inch is used for measuring small areas such as display screens, postage stamps, and pressure ratings. Tire pressure and hydraulic system ratings expressed in PSI literally mean pounds per square inch.

How to Convert Square Millimeter to Square Inch

The conversion formula is: 1 mm² = 0.0015500031 in². To convert from Square Millimeter (mm²) to Square Inch (in²), use the formula above or the interactive converter at the top of this page.

05

FAQ

How many Square Inch in 1 Square Millimeter?

1 Square Millimeter (mm²) equals 0.0015500031 Square Inch (in²).

How to convert Square Millimeter to Square Inch?

Multiply the Square Millimeter value by 0.0015500031 to get the equivalent in Square Inch. Formula: 1 mm² = 0.0015500031 in²

What is the formula for Square Millimeter to Square Inch conversion?

1 mm² = 0.0015500031 in²

Glossary

Learn More