1. What is a Well Pump GPM Calculator?

Definition: This calculator estimates the required well pump capacity in gallons per minute (GPM) based on the water demand of household fixtures.

Purpose: It helps homeowners and professionals determine the appropriate well pump size for adequate water supply.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Total required pump capacity (GPM)
• \( Q_i \) — Flow rate of each individual fixture (GPM)

Explanation: The total GPM requirement is the sum of all potential simultaneous water uses in the household.

3. Importance of Proper Pump Sizing

Details: Correct GPM calculation ensures adequate water pressure, prevents pump overworking, and provides sufficient water for simultaneous uses.

4. Using the Calculator

Tips: Enter the GPM requirements for each fixture (default values are typical). The calculator sums all values to determine total required pump capacity.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical household GPM requirement?
A: Most homes need 8-12 GPM, but larger homes with more fixtures may require 15-20 GPM.

Q2: Should I size for peak or average demand?
A: Size for peak demand (when multiple fixtures are used simultaneously).

Q3: What if I have special fixtures like a jacuzzi tub?
A: Add their GPM requirements (typically 4-8 GPM for large tubs) to your calculation.

Q4: How does this relate to pressure tank sizing?
A: Pressure tank size affects pump cycling, while GPM determines flow capacity. Both are important for system design.

Q5: Should I add a safety factor?
A: It's recommended to add 10-20% to the calculated GPM for future needs and system efficiency.