Free Flow Rate Calculator
Calculate volumetric and mass flow rate from pipe diameter and flow velocity.
mm
m/s
kg/m^3
Volumetric Flow Rate
0.01571 m^3/s
Flow Rate (litres/s)15.71 L/s
Mass Flow Rate15.708 kg/s
Volumetric Flow Rate vs Pipe Inner Diameter
Volumetric & Mass Flow Rate
Flow rate through a pipe depends on the cross-sectional area and the average fluid velocity.
Formulas
Q = A V = (pi D^2 / 4) V (volumetric flow)
m_dot = rho Q = rho A V (mass flow)
where D is the pipe diameter, V is the average velocity, and rho is the fluid density.
Example Calculation
Water flowing at 2 m/s through a 100 mm diameter pipe.
- 01D = 100 mm = 0.1 m
- 02A = pi x 0.1^2 / 4 = 0.007854 m^2
- 03Q = 0.007854 x 2 = 0.01571 m^3/s = 15.71 L/s
- 04Mass flow = 1000 x 0.01571 = 15.71 kg/s
Frequently Asked Questions
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