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- p
_{1}– pressure in position one - Static pressure of fluid in the point in which flow parameters are known – referent position
- p
_{2}– pressure in position two - Static pressure of fluid in the point in which flow parameters should be calculated
- D
_{1}- diameter in position one - Internal pipe or stream diameter in the point in which flow parameters are known
- D
_{2}- diameter in position two - Internal pipe or stream diameter in the point in which flow parameters should be calculated
- V
_{1}- velocity in position one - Flow velocity where flow diameter is D1 and where flow parameters are known
- V
_{2}- velocity in position two - Flow velocity where flow diameter is D2 and where flow parameters should be calculated
- z
_{1}– height in position one - Height or elevation of the fluid stream in the point in which flow parameters are known
- z
_{2}– height in position two - Height or elevation of the fluid stream in the point in which flow parameters should be calculated
- q - volumetric flow rate
- Fluid flow rate in terms of units of volume per unit of time. Considered to be constant
- ṁ - mass flow rate
- Fluid flow rate in terms of units of mass per unit of time. Considered to be constant
- ρ - fluid inlet density
- Density of fluid in terms of mass per unit of volume. Considered to be constant
- p
_{1}- pressure drop - Pressure difference between two points of stream line

- Select value to calculate. You should enter not selected one.
- p
_{2} - calculate pressure in position two
- z
_{2} - calculate height in position two
- v
_{2} - calculate velocity in position two

- Available only if "use flow rate q in the calculation" is selected. You should enter values for not selected one.
- v
_{1} - calculate velocity in position one
- D
_{1} - calculate diameter in position one
- q
- calculate flow rate

- Available only if v
_{2}calculation is**not**selected. You should enter values for not selected one. - v
_{2} - calculate velocity in position two
- D
_{2} - calculate diameter in position two