avio
METAR TAF Crosswind Density Pressure Weight Fuel Airspeed Distance PNR Airports Dictionary Blog
EN·ES

Airspeed Converter

Convert indicated airspeed to true airspeed and Mach number using altitude and outside air temperature.

IAS vs TAS

Indicated airspeed is what the airspeed indicator shows. As altitude increases, thinner air makes IAS read lower than the aircraft's true speed through the air. True airspeed is the value used for time and navigation planning.