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**Corrected speed** is the speed a component would rotate at if the inlet temperature corresponded to ambient conditions at sea level, on a standard day (i.e. 288.15 K).

Corrected speed ** can be calculated as follows:
**

Corrected speed is often abbreviated to or (for **referred speed**).

So-called **non-dimensional speed** is proportional to corrected speed:

Nomenclature:

- – stagnation (or total) temperature (in kelvins),
- – real shaft speed,
- – referred temperature.

In relative form, corrected speed, referred speed and non-dimensional speed are all measures of peripheral Mach number.