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Square yards = square feet ÷ 9. Square metres = square feet × 0.09290304. Planning area = converted area × (1 + allowance percent ÷ 100).- Apply the formulaSquare yards = square feet ÷ 9. Square metres = square feet × 0.09290304. Planning area = converted area × (1 + allowance percent ÷ 100).12 sq yd10.0335 sq m · planning 13.2 sq yd with 10% allowance