Millimeters measure length and square feet measure area. They cannot be converted into one another.
Multiply square mm by 0.000010764 to get square feet.
3.875 sq feet
Square feet cannot be converted to millimeters. Square feet is a measure of area and millimeters is a measure of length.
1,500 feet2 is about 139,354,560 mm2
There are linear feet, and square feet, but no "linear square feet".
to calculate square feet you need a 2d shape
Square meters x 10.764 = square feet.
If you have a rectangle, measure the length and width of your surface in millimeters and multiply the values. This gives you the area in square millimeters. If you know the area in square meters, multiply by one million (1 000 000) to get square millimeters.
Square inches x 0.00694 = square feet
You can't actually go from feet to square feet because feet is distance but square feet is area. but to calculate for example the square feet in a rectangle you would do base times height.
Multiply the number of square meters by 10.7639 to get square feet.
Square feet divided by 43,560 = acres