1 square foot = 0.0929 square meter ... 1071 square feet = 99.5 square meters
You can't convert that. Square feet is a unit of area; meter is a unit of length. You can convert square feet to square meters, or feet to meters.
To convert square feet to square meters, use this formula - square feet x 0.092 = square meters:864 x 0.092 = about 80.268 m2
40 square feet are 3.716122 square meters.
25 square feet are 2.322576 square meters.
Multiply square feet by 0.092903 to get square meters.