2.54 exactly
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1 in = 2.54 cm (exactly)
1inch = 2.5cm (general rounding - most people use unless accuracy is vital)57 inches=142.5cmTo be exact though:1inch=2.54cm57 inches= 144.78cmI hope that helps you!
1 in = 2.54 centimeters
139.70 cm1 foot = 30.48 cm1 inch = 2.54 cm4 feet = 4 feet * 30.48 cm/1 foot = 121.92 cm7 inches=7 inches * 2.54cm/1inch = 17.78 cm============================4 feet & 7 inches = .....................139.70 cm
1 in = 0.0254 m (exactly)