1. What is a GPM to CFS Calculator?

Definition: This calculator converts flow rate from gallons per minute (GPM) to cubic feet per second (CFS).

Purpose: It helps engineers, plumbers, and water resource professionals convert between these common flow rate units.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q_{cfs} \) — Flow rate in cubic feet per second (ft³/s)
• \( Q_{gpm} \) — Flow rate in gallons per minute (GPM)
• 448.83 — Conversion factor (gallons per minute to cubic feet per second)

Explanation: There are 448.83 gallons per minute in 1 cubic foot per second.

3. Importance of Flow Rate Conversion

Details: Accurate conversion between GPM and CFS is essential for hydraulic calculations, pipe sizing, and water system design.

4. Using the Calculator

Tips: Simply enter the flow rate in gallons per minute (GPM) and the calculator will provide the equivalent in cubic feet per second (CFS).

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 448.83?
A: This comes from the relationship between gallons and cubic feet (7.48052 gallons per cubic foot) and seconds to minutes (60 seconds per minute).

Q2: When would I need to convert GPM to CFS?
A: Common in water supply systems, irrigation design, and when working with engineering specifications that use different units.

Q3: Is this conversion exact?
A: Yes, the conversion factor is mathematically exact based on standard unit definitions.

Q4: What's a typical GPM value for household plumbing?
A: A standard shower uses about 2.5 GPM, while a kitchen faucet might use 1.5-2.2 GPM.

Q5: How precise should I be with these calculations?
A: For most engineering purposes, 2-3 decimal places is sufficient, though the calculator provides 6 for precision.