Kidney Pool Volume Calculator in Litres and Gallons

How much water your kidney pool can hold? Enter your swimming pool’s length, widest, narrowest width, and depth into our kidney pool volume calculator for an instant, accurate result.

How to Calculate the Volume of a Kidney-Shaped Pool

A kidney-shaped pool looks like a big bean or two connected circles. Since its width isn’t the same on both sides, we have to take extra care when calculating its volume.

Things You Need to Know

Before you start, here’s the important information you’ll need:

1. Length of the Pool

• The distance from one end to the other (longest straight line across).

2. Width at the Widest Point

• Measure the pool’s width at its widest side.

3. Width at the Narrowest Point

• Measure the pool’s width at its narrowest side.

4. Depth of the Pool

• If it’s the same everywhere, use that number.
• If there’s a shallow and a deep end, you need both numbers to find the average depth.

5. Unit of Measurement

• Make sure all measurements are in the same unit (feet, meters, etc.)

6. Conversion Factor

To convert cubic feet to gallons:

• 1 cubic foot = 7.48 US gallons

Or cubic meters to liters:

• 1 cubic meter = 1,000 liters

Steps to Calculate Kidney Pool Volume

Step 1: Measure the Length

Use a measuring tape to find the distance from one end of the pool to the other.

Example: The pool is 30 feet long.

Step 2: Measure the Width at the Widest and Narrowest Points

Measure the pool’s width at its widest and narrowest spots.

Example:

• Widest point = 18 feet
• Narrowest point = 10 feet

Step 3: Measure the Depth

Find how deep the pool is.

• If it’s the same depth all around, use that number.
• If it has a shallow and deep end, add them together and divide by 2 to get the average.

Example:

• Shallow end = 3.5 feet
• Deep end = 6.5 feet

Average Depth = (3.5 + 6.5) ÷ 2 = 5 feet

Step 4: Use the Formula to Find Volume in Cubic Feet

The formula for a kidney-shaped pool is:

Volume = (Length × (Widest Width + Narrowest Width) × 0.45 × Average Depth)

Explanation:

• Multiply the length by the sum of the widest and narrowest widths.
• Multiply that by 0.45 (this factor helps account for the kidney shape).
• Then multiply by the average depth.

Example:

30 × (18 + 10) × 0.45 × 5
= 30 × 28 × 0.45 × 5
= 30 × 28 = 840
= 840 × 0.45 = 378
= 378 × 5 = 1,890 cubic feet

Step 5: Convert Cubic Feet to Gallons

Use the conversion factor:

1 cubic foot = 7.48 gallons

Now multiply:

1,890 × 7.48 = 14,140 gallons

Your kidney-shaped pool can hold about 14,140 gallons of water. We have made these complex calculations simple with kidney pool volume calculator.

Common Inground Kidney Shape Pool Sizes

Average Wall Height
Pool Size	Gallons
16×30	14,900
16×34	16,500
20×38	20,200
18×36	18,000
18×40	19,600
20×42	22,500

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