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- q - volumetric 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
- V - velocity
- Flow velocity in terms of units of distance per unit of time
- D - internal diameter
- Internal circular pipe diameter
- Cv - flow coefficient
- In imperial units - gpm
- Kv - flow coefficient
- In metric units - m
^{3}/h - p - pressure
- Fluid pressure at the start of the pipe for gas density calculation based on the ideal gas state equation
- ρ - fluid density
- Mass per unit of volume

- Select value to calculate. You should enter not selected one.
- q/ṁ
- Calculate flow rate
- Δp
- Calculate pressure drop
- Cv/Kv
- Calculate flow coefficient

- 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.
- Cv
- flow coefficient in imperial units - gpm
- Kv
- flow coefficient in metric units - m
^{3}/h

- Select value to input. You should enter selected one. The other one will be calculated.
- v
- flow velocity
- D
- internal pipe diameter