18ft Round Pool Volume Calculator

Pool Volume Formula:

\[ V = \pi \times R^2 \times D \times 7.48 \]

Pool Volume:

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1. What is the Round Pool Volume Formula?

The round pool volume formula calculates the water capacity in gallons for circular swimming pools. It accounts for the pool's radius and average depth to determine total volume.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ V = \pi \times R^2 \times D \times 7.48 \]

Where:

\( V \) — Volume in gallons
\( R \) — Radius in feet
\( D \) — Average depth in feet
7.48 — Conversion factor (cubic feet to gallons)

Explanation: The formula calculates the cylindrical volume in cubic feet then converts it to gallons (1 cubic foot = 7.48 gallons).

3. Importance of Accurate Volume Calculation

Details: Knowing your pool's exact volume is essential for proper chemical treatment, pump sizing, and heating calculations.

4. Using the Calculator

Tips: Measure radius from center to edge. For depth, average shallow and deep end measurements if your pool has a slope.

5. Frequently Asked Questions (FAQ)

Q1: Why is 7.48 used in the formula?
A: There are 7.48 gallons in one cubic foot of water - this converts the cubic feet volume to gallons.

Q2: How do I measure average depth?
A: (Shallow end depth + Deep end depth) ÷ 2. For uniform depth pools, just use that measurement.

Q3: What's the volume of a standard 18ft round pool?
A: For 18ft diameter (9ft radius) and 4ft depth: π × 9² × 4 × 7.48 ≈ 7,646 gallons.

Q4: Does this work for oval pools?
A: No, oval pools require a different formula accounting for both long and short radii.

Q5: How accurate is this calculation?
A: Very accurate for perfect cylinders. Actual volume may vary slightly with pool shape variations.