Square millimeters, just like square meters, is a unit for measuring the area of various shapes. One meter2 is 1000000 millimeters2. The calculations in the mind are difficult, because the numbers are so big. We simplified your life and created a simple, convenient and fast online mm2 to m2 calculator. Just enter any number and click on the “Calculate” button. You can also bookmark this page with your browser to always have this tool at hand.