Pipe Flow Rate Calculator

Fluid velocity (0.6-2.5 m/s recommended for water)
Internal pipe diameter in millimeters
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What This Calculator Does

This calculator computes the volumetric flow rate (Q) through a pipe using the continuity equation Q = V × A. It helps engineers determine pipe capacity, size pumps, and design fluid distribution systems. The calculation converts inputs to SI units, computes cross-sectional area from diameter, then multiplies by velocity to obtain flow rate. Results are provided in both m³/h (common for engineering) and m³/s (SI unit).

Key Points:
  • Based on continuity equation (conservation of mass)
  • Assumes incompressible fluid (water, oil)
  • Valid for full pipe flow
  • Accounts for actual pipe internal diameter
Calculation Steps:
  1. Enter all required parameters
  2. Click "Update Calculation"
  3. Review results and analysis
Formula Variables:
Q Flow Rate (m³/h)
V Velocity (m/s)
A Cross-sectional Area (m²)