GPM to LPM Calculator

Flow Rate Conversion Formula:

\[ Q_{lpm} = Q_{gpm} \times 3.785 \]

Flow Rate (LPM):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is a GPM to LPM Calculator?

Definition: This calculator converts flow rate from gallons per minute (GPM) to liters per minute (LPM).

Purpose: It helps engineers, plumbers, and technicians working with fluid systems to easily convert between these common flow rate units.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q_{lpm} = Q_{gpm} \times 3.785 \]

Where:

\( Q_{lpm} \) — Flow rate in liters per minute (LPM)
\( Q_{gpm} \) — Flow rate in gallons per minute (GPM)
3.785 — Conversion factor (1 gallon = 3.785 liters)

Explanation: The conversion is a simple multiplication since 1 US gallon equals exactly 3.785411784 liters.

3. Importance of Flow Rate Conversion

Details: Accurate flow rate conversion is essential for system design, pump sizing, and ensuring compatibility between components using different measurement systems.

4. Using the Calculator

Tips: Simply enter the flow rate in gallons per minute (GPM) and the calculator will instantly provide the equivalent in liters per minute (LPM).

5. Frequently Asked Questions (FAQ)

Q1: Is this conversion exact?
A: Yes, the conversion factor 3.785 is based on the exact definition of 1 US gallon = 3.785411784 liters.

Q2: Does this work for imperial gallons?
A: No, this calculator uses US gallons. For UK imperial gallons (1 gal = 4.54609 L), you would need a different conversion factor.

Q3: When would I need to convert GPM to LPM?
A: Common when working with international specifications, metric system components, or when documentation uses different units.

Q4: What's a typical GPM value for household plumbing?
A: Standard faucets typically flow at 1-2 GPM (3.8-7.6 LPM), while shower heads might be 2.5 GPM (9.5 LPM) or less.

Q5: Can I convert LPM back to GPM?
A: Yes, simply divide the LPM value by 3.785 to get GPM.