1. What is a Flow Rate in GPM Calculator?

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

Purpose: It helps engineers, plumbers, and fluid system designers determine the flow rate in piping systems.

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 (cubic feet per second to GPM)

Explanation: The velocity and area are multiplied, then converted from cubic feet per second to gallons per minute.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate calculations ensure proper system design, pump sizing, and compliance with plumbing codes.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is a typical velocity for water in pipes?
A: For residential plumbing, 5-8 ft/s is common. For industrial systems, it may be higher.

Q2: How do I calculate pipe cross-sectional area?
A: For circular pipes: \( A = \pi \times (D/2)^2 \) where D is diameter in feet.

Q3: Why is the conversion factor 448.83?
A: It converts cubic feet (7.48052 gallons) per second to gallons per minute (×60 seconds).

Q4: Can this be used for other liquids?
A: Yes, but the result will be in GPM of that liquid (density doesn't affect volumetric flow rate).

Q5: What's the maximum flow rate this can calculate?
A: There's no theoretical limit, but practical pipe systems rarely exceed 10,000 GPM.