393 Inches To Feet / An inch is a unit of length equal to exactly 2.54 centimeters. 393 Inches To Feet : Angstroms (a) astronomical units (au) centimetres (cm) decimetres (dm) feet (ft) inches (in) kilometres (km) light years (ly) meters (m) miles (mi) mils (mil) millimetres (mm) nanometres (nm) nautical miles (nmi).