Liquid Velocity Calculator

Liquid Velocity Calculator

Enter flow rate and internal diameter to compute velocity.

Area (A): —

Velocity (v): —

Uses v = Q / A with unit conversion. Results shown in m² for area and m/s & ft/s for velocity.

How the Liquid Velocity Calculator Works

The calculator computes velocity from volumetric flow and internal diameter using the continuity equation: v = Q / A, where the cross-sectional area A = π·D²/4.

Inputs

  • Flow Rate (Q): Enter your flow in GPM, L/min, or m³/s.
  • Diameter (D): Use the internal nozzle or pipe diameter in inches or mm.

Outputs

  • Area (A): Cross-sectional area in m².
  • Velocity (v): Liquid velocity in m/s and ft/s.

Example

Given: Q = 20 GPM, D = 0.25 in

  1. Convert units to SI (the calculator does this automatically).
  2. Compute area: A = π·D²/4.
  3. Compute velocity: v = Q / A → ~39.8 m/s (~130.7 ft/s).

When Velocity Matters

  • Spray impact & reach: Higher velocity increases jet momentum and throw.
  • Erosion & wear: Excess velocity can damage piping and shorten nozzle life.
  • Process control: Coating, rinsing, and cleaning steps often target a velocity band.

Tips for Accurate Results

  • Use the internal diameter (ID), not nominal pipe size.
  • If you know actual flow from a meter, this method inherently includes real-world losses.
  • For pressure-based estimates (e.g., v ≈ Cd√(2ΔP/ρ)), add our Advanced mode or contact us.
Need sizing help? NozzlePro engineers can size orifices, estimate impact/coverage, and recommend materials.