This calculator allows you to convert from Mach (20°C, 1 atm) to Yard/second and in a reverse direction. To convert from Mach (20°C, 1 atm) to Yard/second, enter the amount of Mach (20°C, 1 atm) into the first input and to convert from Yard/second to Mach (20°C, 1 atm), enter the amount of Yard/second into the second input.