CFM to GPM Conversion Calculator

Conversion Formula:

\[ Q_{gpm} = \frac{Q_{cfm}}{7.481} \]

Flow Rate (GPM):

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1. What is CFM to GPM Conversion?

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

Purpose: It helps engineers, plumbers, and technicians convert between these common flow rate units used in fluid systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q_{gpm} = \frac{Q_{cfm}}{7.481} \]

Where:

\( Q_{gpm} \) — Flow rate in gallons per minute (GPM)
\( Q_{cfm} \) — Flow rate in cubic feet per minute (CFM)
7.481 — Conversion factor (1 cubic foot = 7.481 gallons)

Explanation: The CFM value is divided by 7.481 to convert cubic feet to gallons.

3. Importance of Flow Rate Conversion

Details: Accurate conversion between CFM and GPM is essential for system design, pump selection, and comparing specifications that use different units.

4. Using the Calculator

Tips: Simply enter the flow rate in CFM (must be > 0) and the calculator will provide the equivalent in GPM.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 7.481?
A: This is the exact conversion factor between cubic feet and gallons (1 ft³ = 7.48051948 gallons, typically rounded to 7.481).

Q2: When would I need to convert CFM to GPM?
A: When working with fluid systems where some components are specified in CFM (like air compressors) and others in GPM (like pumps).

Q3: Does this conversion work for all fluids?
A: Yes, this is purely a unit conversion. For different fluids, you may need additional calculations for mass flow rate or pressure considerations.

Q4: How accurate is this conversion?
A: The conversion is mathematically exact, though practical measurements may have instrument error.

Q5: Can I convert GPM back to CFM?
A: Yes, simply multiply GPM by 7.481 to get CFM.