Standard atmosphere properties calculator – get pressure, temperature, density, viscosity and sound speed. Airspeed converter – convert between TAS, CAS and Mach number. Calculate geometric altitude out of pressure altitude for standard and off standard day’s temperature profile. A constant temperature shift is assumed. Free version is limited to 5 calculations in a row.The software can be used for planning of flights up to 60kft, Mach 3 and ISA +/-30 degrees.