Square feet measures a two-dimensional area using imperial units while cubic meters measures the three-dimensional volume. Since one unit measures area while the other measures volume, you cannot directly convert from square feet to cubic meters. However, you can find the third dimension to convert area to volume and then convert from imperial units to metric units.
Measure the third dimension of the item that you know the area of, which will usually be depth, in feet. For example, if you know the area based on the length and the width of a box, you would need to measure the depth in feet.
Multiply the number of square feet by the third dimension, usually the depth, as measured in feet, to get from square feet to cubic feet. For example, if the area equals 9 square feet and the depth equals 4 feet, you would multiply 9 square feet by 4 feet to get 36 cubic feet.
Multiply the number of cubic feet by 0.0283168466 cubic meters per cubic foot. In this example, you would multiply 36 cubic feet by 0.0283168466 cubic meters per cubic foot to get 1.019406478 cubic meters.