Home
Back
Formula For GPM Calculations:
| From: | To: |
The GPM (Gallons Per Minute) calculation formula is used to determine the flow rate of fluids in piping systems. It calculates the volume of fluid flowing through a pipe per minute based on velocity and cross-sectional area.
The calculator uses the GPM formula:
Where:
Explanation: The formula converts velocity and area measurements into volumetric flow rate, with the conversion factor accounting for unit changes from cubic feet per second to gallons per minute.
Details: Accurate GPM calculation is essential for designing piping systems, selecting pump sizes, ensuring proper fluid transport, and maintaining system efficiency in various engineering applications.
Tips: Enter velocity in feet per second and area in square feet. Both values must be positive numbers. The calculator will automatically compute the flow rate in gallons per minute.
Q1: What is the conversion factor 448.8 derived from?
A: The factor comes from converting cubic feet per second to gallons per minute (1 cubic foot = 7.48052 gallons × 60 seconds = 448.8312, rounded to 448.8).
Q2: When is this formula typically used?
A: This formula is commonly used in hydraulic engineering, plumbing design, irrigation systems, and industrial fluid transport applications.
Q3: What are typical velocity ranges for water in pipes?
A: For water systems, typical velocities range from 2-8 feet per second, with 4-6 feet per second being optimal for most applications.
Q4: How do I calculate pipe area?
A: For circular pipes, area = π × (diameter/2)². Remember to convert diameter from inches to feet if necessary.
Q5: Can this formula be used for other fluids?
A: Yes, but the conversion factor remains the same as it's based on volume conversion, not fluid properties. The formula works for any fluid where velocity and area are measured consistently.