Enter the total altitude (ft) and the total pressure (atm) into the Calculator. The calculator will evaluate the Altitude Pressure Ratio. 

Altitude Pressure Ratio Formula

APR = A / P


  • APR is the Altitude Pressure Ratio (ft/atm)
  • A is the total altitude (ft)
  • P is the total pressure (atm)

To calculate the Altitude Pressure Ratio, divide the current altitude by the current pressure.

How to Calculate Altitude Pressure Ratio?

The following steps outline how to calculate the Altitude Pressure Ratio.

  1. First, determine the total altitude (ft). 
  2. Next, determine the total pressure (atm). 
  3. Next, gather the formula from above = APR = A / P.
  4. Finally, calculate the Altitude Pressure Ratio.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total altitude (ft) = 5

total pressure (atm) = 8