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Square metres = square feet × 0.09290304. If an allowance is entered, planning square metres = square metres × (1 + allowance percent ÷ 100).- Apply the formulaSquare metres = square feet × 0.09290304. If an allowance is entered, planning square metres = square metres × (1 + allowance percent ÷ 100).23.2258 sq m250 sq ft converted at 0.09290304 sq m per sq ft