Physics Calculators
Flow Rate Calculator
Calculate volumetric and mass flow rate from cross-sectional geometry, velocity, and density.
Compute volumetric flow rate with Q = A × v and mass flow rate with ṁ = ρ × Q.
Supports circular pipe diameter mode and custom area mode, with unit conversion for velocity, density, and output flow rates.
Shape
Diameter (d)
in
Velocity
ft/s
Density
kg/m³
Flow rate
(Volumetric) flow rate
ft³/s
Mass flow rate
lb/s