Pool Volume Estimator

Estimate your swimming pool’s water volume in gallons or liters. Supports rectangular, round, oval, kidney, and L-shaped pools.

How to Use this Pool Volume Estimator

Follow these steps to estimate how much water your pool holds:

1. Choose Your Units:
   Select Imperial if you want results in Gallons (using feet). Select Metric if you want results in Liters (using meters).

2. Select the Shape:
   Pick the shape that matches your pool. The tool will automatically change the input boxes based on your choice (e.g., it will show Diameter for round pools and Section A/B for L-shaped pools).

3. Enter Dimensions:
   Measure the inside of your pool (from wall to wall) and enter the numbers.

   • Tip: Measure at the water level, not the very top of the pool edge.

4. Enter the Depths:
   Enter the depth of the Shallow End (where you stand) and the Deep End (where you dive). If your pool is the same depth everywhere, enter the same number in both boxes.

5. Click Calculate Volume:
   The tool will instantly show you the total capacity in Gallons/Liters and the exact Cubic Volume.

How Pool Volume Estimator Works 

It uses verified geometric formulas to give you a sacha (true) estimate. Here is the internal process:

Step 1: Finding the Average Depth

Since most pools have a slope, the tool first finds the Average Depth.

• The Math: (Shallow Depth + Deep Depth) ÷ 2 = Average Depth.

• This ensures that the calculation accounts for the deep end properly.

Step 2: Calculating Surface Area

Depending on the shape you selected, the tool calculates the surface area using these standard formulas:

• Rectangular: Length × Width.

• Circular: It takes your diameter, divides it by 2 to get the radius, then uses π × Radius².

• Oval: Uses a special multiplier (0.785) to account for the curved corners.

• Kidney Shape: Uses the Width A + Width B method to estimate the irregular curves.

• L-Shape: Treats the pool as two separate rectangles and adds them together.

Step 3: Calculating Cubic Volume

Once the tool knows the surface area and the average depth, it multiplies them:

• Surface Area × Average Depth = Total Cubic Volume.

Step 4: Final Conversion

The final step is converting that cubic space into liquid volume:

• For Imperial: It multiplies Cubic Feet by 7.48 (because 1 cubic foot holds roughly 7.48 US gallons).

• For Metric: It multiplies Cubic Meters by 1,000 (because 1 cubic meter holds exactly 1,000 liters).