Flow Rate to Velocity Calculator
The below fluid flow calculator determines the flow velocity, flow rate or diameter of the pipe provided other two parameters are given.
Fluid Flow Calculator
Calculation Mode
Calculate flow rate from pipe diameter and velocity.
Results
Flow Rate: 0.01178 m³/s
(186.46 GPM,
11.78 l/s)
Velocity: 1.50 m/s
(4.92 ft/s)
Cross-Sectional Area: 0.00785 m²
Notes:
The calculator currently does not explicitly account for the fluid type (water, oil, gas, etc.). It assumes incompressible flow and calculates based on:
- Continuity Equation (
Q = A × V) - Pipe geometry (diameter, area)
- Unit conversions
This means it works well for water-like fluids (low viscosity, incompressible) but does not adjust for:
- Density (ρ) – Important for pressure drop and pump power calculations
- Viscosity (μ) – Critical for Reynolds number and friction loss
- Compressibility – Needed for gases