Enter the total head (ft) and the specific gravity into the calculator to determine the Pressure From Head. 

Pressure From Head Formula

The following formula is used to calculate the Pressure From Head. 

P = .433*H*SG
  • Where P is the Pressure From Head (psi)
  • H is the total head (ft) 
  • SG is the specific gravity 

To calculate pressure from head, multiply the head by .433, then multiply again by the specific gravity.

How to Calculate Pressure From Head?

The following two example problems outline how to calculate the Pressure From Head.

Example Problem #1:

  1. First, determine the total head (ft). In this example, the total head (ft) is given as 1235.
  2. Next, determine the specific gravity. For this problem, the specific gravity is given as 40.
  3. Finally, calculate the Pressure From Head using the equation above: 

P = .433*H*SG

Inserting the values from above and solving the equation with the imputed values gives: 

P = .433*1235*40 = 21390.2 (psi)

Example Problem #2: 

Using the same process as above, first define the variables required by the formula. In this case, these values are:

total head (ft) = 55

specific gravity = 125

Entering these values yields:

P = .433*55*125 = 2976.875 (psi)