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Decimal feet = inches ÷ 12. Whole feet = floor(inches ÷ 12). Remaining inches = inches − whole feet × 12. Optional planning feet = (inches + allowance inches) ÷ 12.- Apply the formulaDecimal feet = inches ÷ 12. Whole feet = floor(inches ÷ 12). Remaining inches = inches − whole feet × 12. Optional planning feet = (inches + allowance inches) ÷ 12.5.8333 feet5 ft 10 in · 177.8 cm