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Pool Volume Calculator

Calculate the volume of your swimming pool in gallons or liters based on its shape and dimensions. Perfect for determining water requirements, chemical dosages, and maintenance needs.

Choose the shape that best matches your pool
Enter the longest dimension of your pool
Enter the width of your pool (for rectangular and oval shapes)
For pools with varying depths, use the average depth
Choose your preferred volume measurement unit

How to Use This Calculator

  1. Select your pool shape from the dropdown menu
  2. Enter the length and width of your pool (for rectangular and oval shapes)
  3. Input the average depth of your pool
  4. Choose your preferred volume units (gallons or liters)
  5. Click Calculate to see your pool's volume and related information

Formula Used

Volume = Length × Width × Average Depth × 7.48 (for gallons)

Where:

  • Length = Longest dimension of the pool (feet)
  • Width = Shorter dimension of the pool (feet)
  • Average Depth = Average water depth (feet)
  • 7.48 = Conversion factor from cubic feet to gallons
  • 1 cubic foot = 7.48 gallons = 28.32 liters

Example Calculation

Real-World Scenario:

A homeowner wants to calculate the volume of their rectangular swimming pool to determine how much water and chemicals they need.

Given:

  • Pool Shape: Rectangular
  • Length: 20 feet
  • Width: 40 feet
  • Average Depth: 5 feet
  • Units: Gallons

Calculation:

Volume = 20 ft × 40 ft × 5 ft × 7.48 = 29,920 gallons

Result: The pool holds approximately 29,920 gallons of water, requiring about 224,400 pounds of water to fill.

Why This Calculation Matters

Practical Applications

  • Determining water requirements for filling or refilling
  • Calculating chemical dosages for pool maintenance
  • Estimating heating costs for pool temperature control
  • Planning for pool covers and liners
  • Understanding water usage and conservation

Key Benefits

  • Accurate volume calculations for proper chemical balance
  • Cost estimation for water and energy usage
  • Prevent over or under-dosing of pool chemicals
  • Helps in pool maintenance planning
  • Essential for pool safety and compliance

Common Mistakes & Tips

Many pool owners measure the entire pool structure including coping and deck areas. Always measure the actual water surface dimensions, not including the surrounding deck or coping. Measure from the inside edges where the water meets the pool wall.

For pools with varying depths (shallow and deep ends), calculate the average depth by adding the shallow end depth and deep end depth, then dividing by 2. For example, if your pool is 3 feet deep at the shallow end and 8 feet deep at the deep end, the average depth is (3 + 8) ÷ 2 = 5.5 feet.

Always ensure consistent units throughout your calculation. If measuring in feet, the result will be in cubic feet, which then needs conversion to gallons (1 cubic foot = 7.48 gallons) or liters (1 cubic foot = 28.32 liters). Mixing metric and imperial units will lead to incorrect results.

Frequently Asked Questions

For irregularly shaped pools, divide the pool into smaller rectangular or circular sections, calculate the volume of each section separately, then add them together. Alternatively, use the average of the longest and shortest dimensions for oval pools, or measure the diameter for circular pools.

The conversion factor of 7.48 comes from the fact that one cubic foot of water equals approximately 7.48 gallons. This is a standard conversion in the US measurement system. For metric measurements, 1 cubic foot equals 28.32 liters.

For most pool maintenance purposes, measurements within 6-12 inches (0.5-1 foot) are sufficient. Small variations in measurement won't significantly impact chemical dosing or water volume calculations. However, for precise applications like pool construction or major renovations, more accurate measurements may be needed.

References & Disclaimer

Pool Maintenance Disclaimer

This pool volume calculator provides estimates for informational purposes only. Actual pool volumes may vary due to pool shape irregularities, water displacement by swimmers and equipment, and other factors. Always verify calculations with professional measurements for critical applications such as chemical dosing, pool construction, or water treatment decisions.

References

Accuracy Notice

This calculator provides volume estimates based on standard geometric formulas. Actual pool volumes may differ due to construction variations, pool accessories, and water displacement. For precise measurements, consult with a professional pool service or use water meter readings.

About the Author

Kumaravel Madhavan

Web developer and data researcher creating accurate, easy-to-use calculators across health, finance, education, and construction and more. Works with subject-matter experts to ensure formulas meet trusted standards like WHO, NIH, and ISO.

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