GPM Flow Rate Calculator

Flow Rate Formula:

\[ Q_{gpm} = A \times V \times 448.8 \]

Flow Rate (Q_gpm): gpm

Definition: This calculator determines the flow rate in gallons per minute (gpm) based on the cross-sectional area and velocity of the fluid.

Purpose: It helps engineers, plumbers, and fluid system designers calculate flow rates for pipes, channels, and other conduits.

The calculator uses the formula:

\[ Q_{gpm} = A \times V \times 448.8 \]

Where:

Explanation: The flow rate is calculated by multiplying the area by velocity and converting to gallons per minute.

Details: Accurate flow rate calculations are essential for proper system design, pump selection, and ensuring adequate fluid delivery.

Tips: Enter the cross-sectional area in square feet and velocity in feet per second. All values must be > 0.

Q1: What is the 448.8 conversion factor?
A: It converts cubic feet per second to gallons per minute (1 ft³/s = 448.8 gpm).

Q2: How do I find the cross-sectional area?
A: For circular pipes: \( A = \pi \times r^2 \) where r is the radius in feet.

Q3: What's a typical velocity for water in pipes?
A: Typically 2-8 ft/s for water, depending on application and pipe size.

Q4: Can I use this for other fluids?
A: Yes, but the formula assumes water-like viscosity. For other fluids, additional factors may be needed.

Q5: How accurate is this calculation?
A: It provides theoretical flow rate. Actual flow may vary due to friction, turbulence, and other factors.