106 stones will be able to fit if my math is right. I would recommend just getting 100 then if you have extra room but some more.
400 square feet = 37.16 square meters.
400 (sq feet) = 37.161216 sq meters
400 sq metres = 4305.564 sq feet (to 3 dp)
1 sq. m = 10.7639 sq. ft.so: 400 sq. m. = (400 * 10.7639) 4305.56 sq. ft.
1 foot = 0.3048 meter 400 sq feet = 400 x 0.3048 x 0.3048 sq meters
1 foot = 0.3048 meter 400 sq feet = 400 x 0.3048 x 0.3048 sq meters
400 sq cm equals 0.43 square feet.
3,600
As a square foot will require 8 bricks of standard size, we will require around 3500 bricks for 400 sq feet.
To determine what the area of something is, you determine length X width. So to determine how many feet are in 400 sq ft, you must determine what X what equals 400. This would mean that the length is 20 feet and the width is 20 feet.
400 square ft = 37.16 square m
400 20 x 20 is 400 sq. Ft.