How do I calculate the average depth of my pool?

If your pool has a gradual slope, the formula is simple: (Depth of Shallow End + Depth of Deep End) / 2. For example, if your shallow end is 3 feet and your deep end is 8 feet, your average depth is 5.5 feet.

Does pool shape affect the multiplier?

Yes! A rectangular pool holds more water than an oval pool of the same length and width because the corners are filled. • Rectangle: L x W x Avg Depth x 7.5 • Oval/Round: L x W x Avg Depth x 5.9

What if I have a kidney or free-form pool?

For kidney shapes, measure the widest points of the two bulges to get an average width, or treat it as two separate circles. For complex free-form designs, it is best to ask your pool builder for the engineering specs from the original installation.

I’m planning a new pool. How many gallons is a typical plunge pool?

Plunge pools are designed for relaxation and efficiency. A typical 10' x 20' plunge pool usually holds between 4,000 and 8,000 gallons, making them easier to heat and maintain than larger traditional pools.

Calculate Your Pool Volume in Seconds!

Easily Calculate Your Pool's Volume in Gallons With Our Free Tool

Eliminate the guesswork. Use our free, easy-to-use calculator to determine exactly how much water your pool holds, ensuring perfect chemical balance and efficient maintenance for your backyard oasis.

Pool Volume Calculator

Knowing your pool's exact volume is the first step to a healthy, sparkling swimming environment. Whether you have a standard rectangle, a free-form lagoon, or a circular plunge pool, our calculator provides the precise gallonage you need to manage your pool like a pro.

Instructions:

Enter your pool's length and width in feet.
Enter the average depth (see our FAQ below if you aren't sure how to find this).
Select your pool shape.
Click "Calculate" to see your total volume in gallons.

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Why Knowing Your Pool Volume Matters

1

Accurate Chemical Balancing

The difference between a safe, clear pool and cloudy water often comes down to dosage. Pool chemicals—from chlorine shock to pH balancers—are dosed based on water volume (e.g., "add 1 lb per 10,000 gallons").

2

Proper Equipment Sizing

Heaters: An undersized heater will run constantly without warming your pool, driving up energy bills.

Pumps & Filters: Your pump must turn over the entire volume of water within a specific timeframe (turnover rate) to keep it clean. You can't buy the right pump without knowing the volume.

3

Conservation & Cost

If you ever need to drain and refill your pool for repairs, knowing the volume helps you estimate the cost of water delivery or municipal water usage, preventing shock when the utility bill arrives.

Quick Reference: Common Pool Volume Chart

If you are in the planning stages of a new build or have standard dimensions, this chart provides quick estimates for rectangular pools.

Pool Dimensions	Avg. Depth @ 3.5'	Avg. Depth @ 4.0'	Avg. Depth @ 4.5'	Avg. Depth @ 5.0'
25' x 50'	32800	37400	42200	46900
12'x24'	7600	8600	9700	10800
14' x 28'	10300	11800	13200	14700
16' x 32'	13400	15400	17300	19200
18' x 36'	17000	19400	21900	24300
20' x 40'	21000	24000	27000	30000

Note: These figures are approximations for standard rectangular shapes. Custom features like tanning ledges, deep ends, or free-form curves will alter the total volume.

Frequently asked questions

Ready to Upgrade Your Backyard?

Knowing your pool volume is great for maintenance, but if your current pool needs a renovation, have more questions, or if you're dreaming of building a new one, we are here to help.

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