Created By : Naaz Fatima

Reviewed By : Rajashekhar Valipishetty

Last Updated : Apr 10, 2023

If you want to compare two points on a streamline and determine the elevation, flow speed and pressure at any of them then Bernoulli Equation Calculator can be of extreme help for you. All you need to do is provide the required paramaters in the tool and find out the unknown parameter easily.

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Gravitational acceleration
Fluid density
Height (h1)
Speed (v1):
Pressure (p2)
Height (h2)
Speed (v2):

Bernoulli Equation

Bernoulli's Equation describes the steady flow of an incompressible fluid. As per the Bernoullis Principle the total pressure of such fluid remains constant along the streamline irrespective of the changes in the Environment.


Bernoullis Equation is given by the formula p + 1/2ρv² + ρhg = constant

  • Where p is the pressure at choosen point
  • ρ is the fluid density
  • v is the flow speed at a certain point
  • h is the elevation at chosen point
  • g is the acceleration due to gravity on Earth and is given by 9.80665 m/s²

The term 1/2ρv² denotes the kinetic energy per unit volume and ρhg is the hydrostatic pressure.

Comparing Two Points on a Streamline

We can use Bernoullis Equation to compare two points on a streamline. Since the total pressure on a fluid is constant we can write the expression as follows pΓéü + 1/2ρvΓéü² + ρhΓéüg = pΓéé + 1/2ρvΓéé² + ρhΓéég. If you are aware of any of 5 parameters you can find out the other one quite easily.

How to find Flow Rate?

You can find out the volumetric and mass flow rate of a fluid quite simply using the Bernoullis Equation. Flow rate tells us how many cubic meters or cubic kilograms flow through one point of streamline in 1 hour.

Before knowing the flow rate you need to be aware of area of cross section the fluid is flowing through. Since we use pipes we need to know the diamter of pipes. Volumetric Flow Rate can be calculated using the formula q = π * (d/2)² * v * 3600

  • where q is the volumetrci flow rate and is measured in units m³/h
  • d is the pipe diameter and its units are meter
  • v is the flow speed in m/s

Flow rate is constant along the streamline and thus for comparing two points we have qΓéü = qΓéé or π * (dΓéü/2)² * vΓéü = π * (dΓéé/2)² * vΓéé

You can even calculate the mass flow rate by simply multiplying both the volumetric flow rate and fluid density i.e. m = q * ρ

Physicscalc.Com has got concepts like fluid mechanics, thermodynamics, waves, optics, and many more along with their relevant calculators all one under one roof.

Frequently Asked Questions on Bernoulli Equation Calculator

1. What is Bernoulli's Principle in Simple Terms?

Bernoulli's Principle states that the total mechanical energy of a moving fluid having gravitational potential energy of elevation, the energy associated with fluid pressure, kinetic energy of fluid motion remains constant.

2. What is Bernoulli's Principle Formula?

The Formula for Bernoulli's Principle is given by p + 1/2ρv² + ρhg = constant.

3. What are the Applications of Bernoulli's Equation?

Applications of Bernoulli's Theorem are venturi meter, dynamic lift on wings of aeroplane, swinging of a spring cricket ball, etc.

4. What are the terms between which Bernoulli's Equation Formula states the relation?

Bernoulli's Equation Formula states the relation between pressure, kinetic energy, gravitational potential energy.