Calculate volumetric flow rate, mass flow rate, flow velocity, and pipe sizing for fluid dynamics applications in plumbing, HVAC, irrigation, and hydraulics.
Calculate volumetric flow rate from velocity and pipe dimensions (Q = v × A).
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Flow rate is the volume or mass of fluid passing a point per unit time. Our calculator helps engineers, plumbers, and HVAC professionals size pipes, determine pump requirements, and optimize fluid systems.
Volumetric flow rate (Q) measures the volume of fluid passing a point per unit time, while mass flow rate (ṁ) measures mass per unit time. They're related through fluid density: ṁ = ρ × Q. Flow rate depends on velocity and cross-sectional area: Q = v × A.
Flow Rate Formulas
Q = v × A, ṁ = ρ × QDetermine correct pipe diameter for desired flow and velocity.
Match pump capacity to system flow requirements.
Balance flow velocity against pressure drop and energy costs.
Size water supply and drain pipes for buildings.
Calculate ductwork airflow and ventilation requirements.
Design drip and sprinkler systems for agriculture.
Size process piping for chemical and manufacturing plants.
Volumetric flow rate (Q) measures volume per time (e.g., liters/minute), while mass flow rate (ṁ) measures mass per time (e.g., kg/s). They're related by density: ṁ = ρ × Q. Mass flow rate is preferred for compressible fluids like gases where density changes with pressure.