Enter the suction pressure (Pa) and the design pressure (Pa) into the calculator to determine the Pump Discharge Pressure. 

Pump Discharge Pressure Formula

The following formula is used to calculate the Pump Discharge Pressure. 

Ppump = Ps + Pd
  • Where Ppump is the Pump Discharge Pressure (Pa)
  • Ps is the suction pressure (Pa) 
  • Pd is the design pressure (Pa) 

To calculate the pump discharge pressure, sum the suction pressure and the design pressure.

How to Calculate Pump Discharge Pressure?

The following two example problems outline how to calculate the Pump Discharge Pressure.

Example Problem #1:

  1. First, determine the suction pressure (Pa). In this example, the suction pressure (Pa) is given as 54.
  2. Next, determine the design pressure (Pa). For this problem, the design pressure (Pa) is given as 15.
  3. Finally, calculate the Pump Discharge Pressure using the equation above: 

Ppump = Ps + Pd

Inserting the values from above and solving the equation: 

Ppump = 54 + 15 = 69 (Pa)


What is suction pressure in pumps?

Suction pressure in pumps refers to the pressure at which the fluid is being fed into the pump. It’s a critical parameter that influences the pump’s ability to lift the fluid and impacts the overall pump discharge pressure.

Why is design pressure important in calculating pump discharge pressure?

Design pressure is crucial because it represents the additional pressure needed to overcome system resistance and achieve the desired flow rate and pressure at the discharge end. It ensures the pump meets the operational requirements of the system it serves.

How can incorrect calculation of pump discharge pressure affect a system?

An incorrect calculation of pump discharge pressure can lead to several issues, including inadequate flow rates, potential damage to the pump or system components due to overpressure, and inefficient operation leading to increased energy consumption and operational costs.