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Mihsaba›Bernoulli Equation Calculator

Bernoulli Equation Calculator

Calculate pressure at a second point in ideal flow from pressure, velocity, elevation and density at two points.

These are ideal fluid models; viscosity, losses, friction, compressibility and real-system efficiency are excluded unless stated.

How to use

Bernoulli’s equation relates pressure, kinetic and elevation energy terms along a streamline in an ideal-flow model.

  1. Enter ρ and g.
  2. Enter P₁, v₁, h₁.
  3. Enter v₂, h₂.
  4. Calculate P₂.

How it is calculated

P₁+½ρv₁²+ρgh₁=P₂+½ρv₂²+ρgh₂

Example

At equal elevation, increasing velocity from point 1 to point 2 lowers static pressure in the ideal model.

Important notes

Assumes steady, inviscid, incompressible flow along a streamline with no pumps, turbines or losses between points.

Frequently asked questions

Valid with friction?

Not in this simple form; head loss must be added.

Can P₂ be negative?

Mathematically relative to the chosen pressure reference; it may flag unrealistic assumptions.

Does velocity affect pressure?

Yes through ½ρv².