A regular shape such as a square or rectangle - length times width.
If it is an irregular shape, fit known sized squares and triangles within the shape's border and work out area of a square and a triangle times the number of squares and triangles.
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Square metres are a unit of area. Feet are a unit of length. The two units are therefore incompatible.
square feet (not feets) measure area, metres measure length. They are not comparable.
Meter is a unit of length and not area, so area can not be calculated in meters. Area can be calculated in square meters.
The most direct way to calculate the area of an irregular shape is to superimpose it on graph paper, and then count the number of complete squares that it covers, and for squares that are only partially covered, estimate how much of the square is covered to the nearest simple fraction (a half, a third etc.). If you want the surrounding area rather than the area of the shape itself, you could calculate the total area and then subtract the area of the shape.
one hundred squar feets