How to Use the Pool Volume Calculator

A Pool Volume Calculator is a tool that helps you estimate how many gallons of water your swimming pool holds based on its shape and dimensions.

This calculator is essential for pool maintenance, especially when adding chemicals, cleaning, or filling the pool. Here’s how to use it correctly:

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Step-by-Step Instructions

1. Choose Your Pool Shape

• Select either Rectangular or Circular from the dropdown menu.
• This will adjust the input fields accordingly.

2. Enter Your Pool’s Dimensions

If your pool is rectangular:

• Enter the Length and Width in feet.

If your pool is circular:

• Enter the Radius in feet (half the diameter).

3. Enter the Average Depth

• Provide the average depth of your pool in feet. If your pool has a shallow and deep end, average the two.

4. Click "Calculate Volume"

• Press the green “Calculate Volume” button.
• The result will show your pool’s total volume in gallons.

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Example:

Rectangular pool:

• Length: 30 ft
• Width: 15 ft
• Depth: 5 ft
  → Volume: 16,830 gallons

Circular pool:

• Radius: 10 ft
• Depth: 5 ft
  → Volume: 11,745 gallons

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Why Knowing Your Pool Volume Matters

• Chemical treatment: Avoid over- or under-dosing chlorine or algaecide.
• Filter size: Select appropriate equipment based on volume.
• Water replacement costs: Estimate the expenses of refilling.
• Time efficiency: Calculate how long it takes to fill or drain.

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Pool Volume Calculator – FAQ

Q1: Is this calculator accurate for irregular-shaped pools?

No, this calculator works best for rectangular or circular pools. For complex shapes (kidney, oval), consult a professional or use an advanced calculator.

Q2: Why is the result in gallons?

Gallons are the standard unit for pool volume in the U.S. To convert to liters, multiply the result by 3.785.

Q3: What if my pool has a slope?

Take the average of the shallow and deep ends. For example, (3 ft + 7 ft) ÷ 2 = 5 ft average depth.

Q4: Can I use this for hot tubs or spas?

Yes, as long as the dimensions are in feet and the shape is circular or rectangular.

Q5: What’s the formula used?

• Rectangular Pool: Length × Width × Average Depth × 7.48
• Circular Pool: π × Radius² × Average Depth × 7.48
  (7.48 is the number of gallons in 1 cubic foot)