Question 1

Why does Mach to TAS need temperature?

Accepted Answer

TAS = Mach × local speed of sound, and speed of sound depends on outside air temperature.

Question 2

What is TAS at Mach 0.82 and 15°C?

Accepted Answer

At ISA sea-level temperature (15°C), speed of sound is about 661.5 kt, so Mach 0.82 ≈ 542 kt TAS.

Question 3

Is this CAS or IAS?

Accepted Answer

This tool converts Mach ↔ true airspeed. For CAS/IAS ↔ TAS, use the dedicated CAS/TAS calculator.

Mach to TAS

Mach ↔ TAS FAQs