Volumetric Flow Rate (Q = Av)
Also known as Q = Av · flow from velocity and area
Enter your known values, leave one input blank, and solves for the missing one. Try different units for next level excitement!
Learning zone
Picture the fluid crossing a plane in the pipe: in one second, a cylinder of length v and cross-section A passes through, so the volume per second is simply Av. Water moving at 1.5 m/s through a 10 cm pipe (A ≈ 78.5 cm²) delivers about 0.0118 m³/s — roughly 700 L/min. Operators size pumps, ducts, and treatment basins with this one relation before anything fancier enters the picture.
Volumetric Flow Rate (Q = Av)
Where
- = Volumetric flow rate
- = Cross-sectional area
- = Flow velocity
Missing one of these? Work it out first, then come back
- Volumetric flow rate — Poiseuille's Law, Hydraulic Power (P = ρgQh)
- Cross-sectional area — Heat Conduction Rate, Resistance of a Wire (R = ρL/A)
- Flow velocity — Dynamic Pressure (q = ½ρv²), Velocity Head (h = v²/2g)