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Square feet = square yards × 9. Square metres = square yards × 0.83612736. Planning area = converted area × (1 + allowance percent ÷ 100).- Apply the formulaSquare feet = square yards × 9. Square metres = square yards × 0.83612736. Planning area = converted area × (1 + allowance percent ÷ 100).108 sq ft10.0335 sq m · planning 118.8 sq ft with 10% allowance