1. What is a Pool Size Calculator in Gallons?

Definition: This calculator estimates the volume of a swimming pool in gallons based on its dimensions (length, width, and average depth).

Purpose: It helps pool owners, installers, and maintenance professionals determine the water capacity of rectangular pools for proper chemical treatment and equipment sizing.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V_{gal} \) — Volume of pool (gallons)
• \( L \) — Length of pool (feet)
• \( W \) — Width of pool (feet)
• \( D_{avg} \) — Average depth of pool (feet)
• 7.48 — Conversion factor (gallons per cubic foot)

Explanation: The pool dimensions are multiplied together to get cubic feet, then converted to gallons using the standard conversion factor.

3. Importance of Pool Volume Calculation

Details: Accurate pool volume is essential for proper chemical dosing, pump/filter sizing, heating calculations, and water replacement planning.

4. Using the Calculator

Tips: Measure your pool's length and width at their longest points. For depth, average the shallow and deep end measurements. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I calculate average depth?
A: Add the shallow end depth to the deep end depth, then divide by 2. For example: (3ft + 8ft)/2 = 5.5ft average depth.

Q2: Does this work for irregular shaped pools?
A: This calculator is for rectangular pools. For irregular shapes, break the pool into rectangular sections and calculate each separately.

Q3: Why 7.48 gallons per cubic foot?
A: This is the standard conversion factor - 1 cubic foot contains approximately 7.48 gallons of water.

Q4: How accurate is this calculation?
A: It's accurate for rectangular pools with straight sides. For freeform pools, consider professional measurement.

Q5: What if my pool has a sloping bottom?
A: Use the average depth calculation method mentioned in Q1 to account for the slope.