1. What is a Flow Rate Formula Calculator?

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

Purpose: It helps engineers, plumbers, and technicians determine fluid flow rates in pipes and channels.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute, GPM)
• \( V \) — Velocity (feet per second, ft/s)
• \( A \) — Cross-sectional area (square feet, ft²)
• 448.83 — Conversion factor (1 ft³/s = 448.83 GPM)

Explanation: The velocity multiplied by area gives flow in ft³/s, which is then converted to GPM.

3. Importance of Flow Rate Calculation

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

4. Using the Calculator

Tips: Enter the fluid velocity in ft/s and the pipe/channel cross-sectional area in ft². All values must be > 0.

5. Frequently Asked Questions (FAQ)

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

Q2: How do I find the cross-sectional area?
A: For circular pipes: \( A = \pi \times r² \) where r is the radius in feet.

Q3: What's a typical velocity for water in pipes?
A: Typically 4-8 ft/s for water supply, but varies by application.

Q4: Can this be used for gases?
A: Yes, but gas flow rates are often measured in different units (CFM, SCFM).

Q5: How does pipe diameter affect flow rate?
A: Flow rate increases with the square of the pipe diameter (for the same velocity).