The question, as stated, cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A cubic metre is a measure of volume, with dimensions [L3]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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25' x 4' = 100 sq ft. 100 sq ft x 1' = 100 cu ft. 100 cu ft x 2 = 200 cu ft.
200ft X 400ft = 80000 sq ft
If you meant cu. in to cu. ft.divide by 1728.
sq feet to sq yards cu ft to cu yards you need depth added to your sq ft to get cu ft such as 70 sq ft x 4 in deep = 23.33 cu ft =.086 cu yd
6"by 6"by" 6"= .5 Cu Ft