Mach Number

The Mach Number calculator computes the mach number based on the velocity, density and bulk modulus.

INSTRUCTIONS: Choose units and enter the following:

• (v) This is the velocity 
• (ρ) This is the density
• (E) This is the bulk modulus

Mach Number (M): The calculator returns mach number as a real number with no units.

Related Calculators

• Mach Number from Velocity and Local Speed of Sound
• Mach Number from Velocity, Density and Bulk Modulus
• Formula for the Speed of Sound
• Speed of Sound in Dry Air
• Knudsen Number
• Distance Sound has Traveled 

The Math / Science

The Mach Number is a dimensionless value useful for analyzing fluid flow dynamics problems where compressibility is a significant factor.  The formula for Mach Number based on the density and bulk modulus is:

      `M = v · sqrt(ρ / E)`

where:

• M is Mach Number
• v is the velocity
• ρ is the density
• E is the bulk modulus