# Pipe flow calculators

## Most wanted Calculators

Most frequently used free online fluid flow calculators for every day flow problems solving. Twenty calculators for desktop and Android smartphones with more to come...

## Everyday Calculators

#### Control valve sizing

Calculate flow coefficient Cv or Kv of liquid control valve for known flow capacity and pressure difference.

#### Natural gas pipeline

Calculate flow rate from known pressure difference in natural gas line with pressure above 1 bar

#### Compressible gas flow

Isothermal (T=const.) flow calculation of any real gas in a closed pipe.

#### Gas discharge flow

Calculate flow rate of compressible gas discharging through valve or pipe to atmosphere.

#### Reynolds number

Calculate Reynolds number from Input velocity, or volumetric, or mass flow rate.

#### Gas control valve sizing

Calculate maximum capacity of control valve or pressure regulator for known upstream and downstream pressure.

#### Heat energy

Calculate heat energy for known weight or volume flow rate, temperature difference and specific heat.

#### Resistance coefficient K

Calculate resistance coefficient K for most common local pipe resistances.

#### Venturi tube

Calculate flow rate through Venturi tube based on the created pressure drop by Venturi effect.

#### Nozzle flow

Calculate Nozzle flow rate for known pressure difference

## and even more...

#### LPG flow and combustion power

Calculate combustion power or flow rate of LPG. Calculate gas and phase pipe diameters

#### Prandtl probe and Pitot tube

Calculate velocity of fluid flow in pipe or open stream by measured dynamic pressure with Prandtl probe and Pitot tube

#### API and Baume specific gravitiy

Convert between API and Baume specific gravity. Calculator applicable for oils and other liquids

#### Combustion heat energy

Fuel combustion heat energy calculator is for calculation of heat energy (heat power) that is released during combustion of specified fuel for known fuel flow rate

## Fluid mechanics learning

#### Theory pages

Every single calculator is supported with flow theory explanation for your reference and full understanding of calculation process.

#### Solved examples

Use solved examples for quick start and short learning curve for this basically simple flow calculators.

#### Questions

If you experience problems with calculator start try to find answers on instructions page.
Have a question about the site or calculators? Try to find the answer immediately on forum.

## Smart phone Calculators

#### Pipe diameter

Calculate pipe diameter for given flow rate. Applicable for liquids and gases.

#### Heat power

Calculate heat power for known flow rate and temperature difference in the heat exchanger

#### Reynolds number

Calculate Reynolds number of fluid flow for given flow velocity and fluid viscosity.