Flow Rate Calculator

Calculate volumetric and mass flow rates for fluids

Method 1: From Area and Velocity (Q = A * v)

Cross-sectional Area (m²):

Or Pipe Diameter (m):

Flow Velocity (m/s):

Method 2: From Volume and Time (Q = V / t)

Volume (m³):

Time (s):

For Mass Flow Rate

Mass (kg):

Fluid Density (kg/m³):

Flow Rate Formulas

Volumetric Flow Rate: Q = A * v = V / t

Mass Flow Rate: dm/dt = rho * Q = m / t

Pipe Area: A = pi * (d/2)²

Continuity: A1 * v1 = A2 * v2