Pool Volume Calculator

How do I Calculate the Number of Gallons in My Swimming Pool?

Calculating the volume of your swimming pool in gallons is essential for proper maintenance and chemical balance. Here’s a simple guide to help you determine the number of gallons in your pool based on its most common sizes and shapes.

Steps to Finding Your Pool's Water Volume

1. Measure Your Pool's Dimensions

• Rectangular/Square Pools: Measure the length, width, and average depth.
• Circular Pools: Measure the diameter and average depth.
• Oval Pools: Measure the longest diameter (length), the shortest diameter (width), and the average depth.
• Irregular Shapes: Break down the pool into smaller, manageable shapes, measure each section, and calculate the volume for each before adding them up.

2. Calculate Volume

• Rectangular/Square Pools: Volume (cubic feet) = Length (ft) × Width (ft) × Average Depth (ft)
• Circular Pools: Volume (cubic feet) = π × (Radius (ft))² × Average Depth (ft), where Radius = Diameter / 2
• Oval Pools: Volume (cubic feet) = Length (ft) × Width (ft) × Average Depth (ft) × 0.785

3. Convert Volume to Gallons

• 1 cubic foot of water = 7.48 gallons
• Convert the volume you calculated in cubic feet to gallons by multiplying by 7.48.

4. Account for Pool Shape and Features

• Irregular Shapes: Add up the volumes of individual sections.
• Features: Adjust for steps, benches, and other features by subtracting their estimated volumes from the total.

5. Adjust for Water Level

• Ensure you measure the actual water depth, not just the pool’s maximum depth, as water level may be lower due to evaporation or intentional underfilling.

Example Calculations

Rectangular Pool (30 ft x 15 ft x 5 ft average depth)

• Volume (cubic feet) = 30 × 15 × 5 = 2250 cubic feet
• Volume (gallons) = 2250 × 7.48 = 16,830 gallons

Circular Pool (24 ft diameter, 4 ft average depth)

• Radius = 24 / 2 = 12 ft
• Volume (cubic feet) = π × 12² × 4 ≈ 1,809.56 cubic feet
• Volume (gallons) = 1,809.56 × 7.48 ≈ 13,536.75 gallons

Oval Pool (30 ft x 15 ft x 4 ft average depth)

• Volume (cubic feet) = 30 × 15 × 4 × 0.785 = 1,413 cubic feet
• Volume (gallons) = 1,413 × 7.48 ≈ 10,572 gallons

By following these steps, you can accurately determine the number of gallons in your swimming pool, ensuring you maintain proper chemical balance and pool health.

How Many Gallons of Water Does Your Pool Hold?

Here is a handy cheat sheet for common pool sizes and their pool volumes.

Inground Pool Gallons

Fiberglass Pools

Here are the top-selling fiberglass pool models, their dimensions including depth, and capacities:

Gunite Pools

Gunite pools are custom-built and can be made to any size and shape. Here are standard sizes and their capacities:

Vinyl Pools

Vinyl liner pools are also highly customizable. Here are some common sizes:

Above Ground Pools Gallons

Why Knowing Your Pool's Water Volume is Important

Understanding your pool's water volume is crucial for several reasons:

1. Chemical Balance: Proper chemical treatment depends on accurate water volume measurements to maintain a safe and clean swimming environment.
2. Equipment Sizing: Filters, pumps, and heaters need to be appropriately sized to your pool's volume for efficient operation.
3. Cost Management: Knowing the volume helps estimate water usage for filling and maintaining the pool, aiding in budgeting for water bills and chemical supplies.
4. Maintenance Scheduling: Volume affects the frequency of maintenance tasks, such as backwashing filters or adding chemicals.

Accurate knowledge of your pool's volume ensures efficient operation and maintenance, leading to a better swimming experience and longer pool life.