Pool Calculator

Pool Volume Calculator

Accurately determine the water volume of your swimming pool in both cubic feet and US gallons. Knowing your pool's volume is crucial for proper chemical dosing, heating calculations, and filter sizing, ensuring a healthy and well-maintained swimming environment.

Understanding Pool Volume

The volume of water in your swimming pool is a fundamental measurement for any pool owner. It directly impacts how you manage your pool, from chemical balancing to energy consumption.

Why is Pool Volume Important?

• Chemical Dosing: Most pool chemicals (chlorine, pH adjusters, algaecides, etc.) are dosed based on the total volume of water. Incorrect volume estimates can lead to over-dosing (wasting chemicals, potential damage, skin/eye irritation) or under-dosing (ineffective sanitation, algae growth).
• Heating Costs: If you heat your pool, knowing the volume helps you estimate heating times and energy costs. Larger volumes require more energy to heat.
• Filtration System Sizing: Your pool filter and pump need to be appropriately sized for your pool's volume to ensure efficient water circulation and cleaning.
• Water Replacement: When performing partial water changes or refilling after evaporation, knowing the volume helps you track how much water is being added or removed.

How to Measure Your Pool Dimensions

Accurate measurements are key to an accurate volume calculation. Use a tape measure and follow these guidelines:

• Length and Width: Measure the longest and widest points of the water surface.
• Average Depth: Pool depths often vary. To find the average depth, measure the shallowest point and the deepest point. Add these two measurements together and divide by two. For example, if your shallow end is 3 feet and your deep end is 8 feet, your average depth is (3 + 8) / 2 = 5.5 feet.
• Diameter (for circular pools): Measure across the widest point of the circle, passing through the center.
• Long and Short Axis (for oval pools): Measure the longest dimension (long axis) and the widest dimension perpendicular to the long axis (short axis).

Formulas Used in This Calculator

The calculator uses standard geometric formulas to determine volume:

• Rectangular Pools: Volume (cubic feet) = Length × Width × Average Depth
• Circular Pools: Volume (cubic feet) = (π/4) × Diameter² × Average Depth
• Oval Pools (approximated as an ellipse): Volume (cubic feet) = (π/4) × Long Axis × Short Axis × Average Depth

Once the volume in cubic feet is calculated, it's converted to US gallons using the conversion factor: 1 cubic foot ≈ 7.48052 US gallons.

Example Calculations:

• Rectangular Pool: Length = 20 ft, Width = 10 ft, Average Depth = 5 ft
  Volume = 20 × 10 × 5 = 1000 cubic feet
  Volume in Gallons = 1000 × 7.48052 = 7480.52 US gallons
• Circular Pool: Diameter = 15 ft, Average Depth = 4 ft
  Volume = (π/4) × 15² × 4 ≈ 706.86 cubic feet
  Volume in Gallons = 706.86 × 7.48052 ≈ 5287.6 US gallons
• Oval Pool: Long Axis = 25 ft, Short Axis = 12 ft, Average Depth = 5 ft
  Volume = (π/4) × 25 × 12 × 5 ≈ 1178.10 cubic feet
  Volume in Gallons = 1178.10 × 7.48052 ≈ 8815.7 US gallons

Use this calculator to quickly and accurately determine your pool's volume and simplify your pool maintenance routine!

Calculated Pool Volume: