Enter the absolute temperature at the surface (K) and the absolute flow temperature (K) into the Temperature Ratio Calculator. The calculator will evaluate and display the Temperature Ratio.

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## Temperature Ratio Formula

The following formula is used to calculate the Temperature Ratio.

**TR = TS / TF**

- Where TR is the Temperature Ratio
- TS is the absolute temperature at the surface (K)
- TF is the absolute flow temperature (K)

## How to Calculate Temperature Ratio?

The following example problems outline how to calculate Temperature Ratio.

Example Problem #1:

- First, determine the absolute temperature at the surface (K).
- The absolute temperature at the surface (K) is given as: 40.

- Next, determine the absolute flow temperature (K).
- The absolute flow temperature (K) is provided as: 70.

- Finally, calculate the Temperature Ratio using the equation above:

TR = TS / TF

The values given above are inserted into the equation below and the solution is calculated:

TR = 40 / 70 = .5714

Example Problem #2:** **

For this problem, the variables required are provided below:

absolute temperature at the surface (K) = 80

absolute flow temperature (K) = 90

Test your knowledge using the equation and check your answer with the calculator above.

TR = TS / TF** = ?**