Actual Flow Rate Formula Calculator

Actual Flow Rate Formula:

\[ Q = V \times A \times 448.83 \]

Flow Rate (Q): GPM

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

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

The calculator uses the formula:

\[ Q = V \times A \times 448.83 \]

Where:

Explanation: The velocity and area are multiplied and then converted from cubic feet per second 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 velocity in ft/s and cross-sectional area in ft². All values must be > 0.

Q1: Why is the conversion factor 448.83?
A: This converts cubic feet per second to gallons per minute (1 ft³/s = 448.83 GPM).

Q2: How do I measure velocity in a pipe?
A: Use flow meters or calculate from pressure differentials using Bernoulli's equation.

Q3: What's a typical velocity for water in pipes?
A: Typically 4-8 ft/s for supply lines, 2-5 ft/s for drain lines.

Q4: How do I calculate pipe area?
A: Area = π × (pipe radius in ft)². For diameter D in inches: A = π × (D/24)².

Q5: Does this work for any fluid?
A: Yes, but the conversion factor assumes US gallons. For mass flow rate, multiply by fluid density.