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