Pressure drop calculator
incompressible flow, losses due to friction calculation
online since 2006
Additional features in download version
save/open resultsprint results
custom fluid properties
K factor for fittings, resistance coefficient
compressible isothermal flow
Registration and subscription
Please login for full calculator service. Use the form on the top of the page.Register an account if you don't have one.
Active subscription is required for full services.
Need a helping hand?
If you need a quick calculation, but you are not still familiar how to use the calculator, you
can order calculation service from the calculator developer.
Description
- p1 - inlet pressure
- Absolute pressure at the pipe start
- p2 - outlet pressure
- Absolute pressure at the pipe end
- Δp - pressure drop
- Pressure difference between pipe start and pipe end
- q - volume flow rate
- Fluid flow rate in terms of units of volume per unit of time
- ṁ - mass flow rate
- Fluid flow rate in terms of units of mass per unit of time
- L - pipe length
- Length of a pipe in which pressure drop is calculated
- D - pipe diameter
- Internal circular pipe diameter
- H - channel height
- The height of channel for rectangle shaped pipe
- W - channel width
- The width of channel for rectangle shape pipe
- kr - pipe roughness
- Pipe internal surface roughness
- V - velocity
- Flow velocity in terms of units of distance per unit of time
- A - area
- Internal pipe cross section area
- f - friction coefficient
- Coefficient of friction for pressure drop due to friction calculation
- Re - Reynolds number
- Dimensionless number representing viscous versus inertial forces ratio
- δ - boundary layer
- Thickness of laminar layer formed in turbulent flow connected to pipe wall surface
- ρ - fluid density
- Mass per unit of volume
- ν - kinematic viscosity
- Result of fluid particles colliding to each other and moving at different velocities in terms of area per square unit of time
- μ - dynamic viscosity
- Result of fluid particles colliding to each other and moving at different velocities in terms of mass per square unit of distance and time
- K - resistance
- Coefficient used for calculation of minor losses due to local resistances in pipe line like bends, tees, reducers, valves, etc.
Calculation setup
- Select value to calculate. You should enter not selected one.
- Δp
- pressure drop
- q / ṁ
- volume/mass flow rate
- D
- internal pipe diameter
- Select value to input. You should enter selected one. The other one will be calculated
- p1
- pressure on the pipe start
- p2
- pressure on the pipe end
- Select value to input. You should enter selected one. The other one will be calculated
- q
- volumetric flow rate
- ṁ
- mass flow rate
- Select value to input. You should enter selected one. The other one will be calculated
- ν
- kinematic viscosity
- μ
- dynamic viscosity
- Select pipe shape
- round pipe
- full cross section fluid flow
- rectangle pipe
- for rectangle channels and full cross section flow
