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, hydrologists, and water management 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: The conversion factor 448.83 comes from the relationship between gallons and cubic feet, and minutes to seconds.

3. Importance of Flow Rate Conversion

Details: Accurate flow rate conversion is essential for hydraulic calculations, pipe sizing, pump selection, and water resource management.

4. Using the Calculator

Tips: Simply enter the flow rate in gallons per minute (GPM). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 448.83?
A: It's derived from 1 cubic foot = 7.48052 gallons and 1 minute = 60 seconds (7.48052 × 60 ≈ 448.83).

Q2: When would I need to convert GPM to CFS?
A: When working with hydraulic models, water rights, or comparing flow rates from different measurement systems.

Q3: How precise is this conversion?
A: Very precise - the calculator uses 6 decimal places for accurate results.

Q4: What's a typical GPM value for household plumbing?
A: A standard shower is about 2.5 GPM (0.00557 CFS), while a garden hose might be 5-10 GPM (0.011-0.022 CFS).

Q5: Can I convert CFS back to GPM?
A: Yes, multiply CFS by 448.83 to get GPM.