None, since there can be no conversion.
A linear (or lineal) metre is a measure of length in 1-dimensional space. A square metre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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18 squares is 167 square meters.
18 square feet = 1.67 square meters.
18 square feet is about 1.7 (1.67225) square meters.
18 hectares equals 180, 000 square meters.
18*13 = 234 square metres