True Airspeed (TAS) Calculator
Convert indicated or calibrated airspeed to true airspeed at altitude. TAS represents the actual speed of the aircraft through the air mass, which increases with altitude as air density decreases. TAS is essential for accurate flight planning, groundspeed calculations, and wind correction.
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Why This Matters to Pilots
True airspeed determines how fast you actually travel through the air mass. At higher altitudes, TAS is significantly higher than IAS — typically 2% per 1,000 ft. This is why jets fly high: they get "free" speed from reduced air density.
For cross-country planning, TAS is essential for calculating groundspeed (TAS ± wind) and therefore fuel burn and ETE. Using IAS for planning would result in significant errors at altitude.
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Frequently Asked Questions
This calculator is for educational and planning purposes only. Always refer to your aircraft's POH/AFM, current NOTAMs, and official weather briefings. No calculator is a substitute for pilot-in-command judgment or CFI guidance.
Last reviewed: July 2026
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