Square millimeters (mm²) to Square feet (ft²) Conversion
Square millimeters
The square millimetre is a unit of area equal to one millionth of a square metre (10⁻⁶ m²). In engineering, cross-sectional areas of wires and cables are standardised in square millimetres — electrical cable ratings specify conductor cross-sections in mm² (e.g., 1.5 mm², 2.5 mm², 4 mm²). In materials testing, stress is calculated as force per unit area in megapascals, where the area is expressed in square millimetres.
Square feet
The square foot is a unit of area equal to exactly 0.09290304 square metres (the square of 0.3048 m). It is the primary unit for measuring floor area and property size in the United States and United Kingdom, and appears in real estate listings, construction blueprints, and rental agreements. Average apartment sizes in the US are commonly described in square feet, where a studio apartment might be 400–600 ft².
| Square millimeters (mm²) | Square feet (ft²) |
|---|---|
| 0.1 mm² | 1.076391041671E-6 ft² |
| 1 mm² | 1.076391041671E-5 ft² |
| 2 mm² | 2.1527820833419E-5 ft² |
| 3 mm² | 3.2291731250129E-5 ft² |
| 5 mm² | 5.3819552083549E-5 ft² |
| 10 mm² | 0.0001076391041671 ft² |
| 20 mm² | 0.00021527820833419 ft² |
| 30 mm² | 0.00032291731250129 ft² |
| 50 mm² | 0.00053819552083549 ft² |
| 100 mm² | 0.001076391041671 ft² |
| 1000 mm² | 0.01076391041671 ft² |