Convert Square Millimeters (mm2) to Square Feet (ft2) with our free, online conversion tool. Get precise results for your area calculations. Simple and fast! How to convert mm2 to ft2 : Enter a value in the mm 2 field and click on the "Calculate square feet" button. Your answer will appear in the ft 2 field. The following is a list of definitions relating to conversions between square millimeters and square feet. What is a square millimeter (mm 2)? Convert area measurements from millimeters to square feet using this online tool. Enter your input in mm ² and get the result in ft ² with a simple formula and examples. Square Foot (0.09m²) The square foot (plural square feet; abbreviated sq ft , sf, ft2) is an imperial unit and U.S. customary unit (non-SI, non-metric) of area, used mainly in the United States and partially in Bangladesh, Canada, Ghana, Hong Kong, India, Malaysia, Nepal, Pakistan, Singapore and the United Kingdom.