Rectangular Pool Dimensions
Oblong Pool Dimensions
Circular Pool Dimensions
Triangular Pool Dimensions
Calculation Result:
Calculated Pool Volume is 0 Gallons
Note: Calculations are based on standard geometric formulas with average depth.
Select a pool shape to see visualization
When I first tried to calculate the volume and capacity of my pool, I realized how important it is to measure the depth of the water correctly, not just the height of the wall. Many pools have complicated shapes, and you often need to make multiple calculations, adding the results together to get an accurate number of gallons. A good tool or pool volume calculator makes the process easier, especially when it rounds decimal points to avoid confusion. It’s important to understand that small rounding differences are not enough to throw off your chemical balance or chemistry. For more detailed information, you can read below or contact a swimming professional for additional help.
In my experience, accurate capacity calculations involve finding the surface area and size of the spa or pool in square feet. This step is key when determining not just the volume, but also the maximum number of persons the pool can safely hold. This article describes in detail how to plan and run the process from start to end, helping you cover every area, even if your pool is irregularly shaped. If you need a guide for other calculations, it’s all about understanding your pool’s design and using the right tool to make your chemical dosing perfectly balanced.
Volume of pool refers to the amount of water your pool is capable of holding, usually in gallons or liters. This number is the basis of all you know in pool care, including making sure you add the right amount of chemicals and even the right pump and filter. The volume puts it volume of your pool gives you the capacity of your pool, and it is needed to ensure clean, safe, and balanced water.
In my professional experience, I have witnessed that lots of pool owners do not realize the importance of knowing the exact volume of their pool. To illustrate, your calculations may be wrong even a bit, and your chemical balance may be wrong, resulting in cloudy or unsafe water. The pool size will be based on the pool length, width, and average depth. In the case of the conventional rectangular pools, the calculation is simple; multiply the three numbers and divide them by their equivalent grams. But in the case of irregular or freeform pools, the process is more detailed. You frequently have to divide the pool into smaller, measurable parts, compute the volume of each part, and add them together.
The proper knowledge of your pool water volume calculator is not only the way to save time and money, but also a lot of frustration. And this is the first, and also the most important step, before a pool volume calculator and chemical adjustment are even considered.
How Does The Pool Volume Calculator Work?
The Pool Volume Calculator is a smart digital tool that helps you determine the total water capacity of your swimming pool in gallons. It works by using standard geometric formulas for different pool shapes, such as rectangular, circular, oval, and triangular, along with your entered measurements for length, width, depth, and diameter.
This calculator automatically applies the right mathematical equation based on the pool’s shape. It uses your deep end and shallow end depths to calculate the average depth, multiplies it by the pool’s area, and then converts the volume into gallons. This helps pool owners know exactly how much water is needed for filling or maintaining their pools.
Let’s look at how it performs the calculations for each shape using real examples from the tool.
How to Calculate Rectangular Pool Volume
For a rectangular pool, the calculator uses this formula:
Volume = Length × Width × Average Depth × 7.5
Where:
- Length and Width are in feet.
- Average Depth = (Deep End + Shallow End) / 2
- The multiplier 7.5 converts cubic feet into gallons.
Example:
Let’s use the same values shown in the image:
- Length = 12 ft
- Width = 33 ft
- Deep End = 11 ft
- Shallow End = 16 ft
Step-by-step Calculation:
- Average Depth = (11 + 16) / 2 = 13.5 ft
- Volume in cubic feet = 12 × 33 × 13.5 = 5346 ft³
- Convert to gallons = 5346 × 7.5 = 40,095 gallons
How to Calculate Circular Pool Volume
For a circular pool, the formula changes slightly because of the pool’s round shape:
Volume = π × Radius2 × Average Depth × 7.5
Where π (pi) is approximately 3.1416.
Example:
- Radius = 12 ft
- Deep End = 22 ft
- Shallow End = 13 ft
Step-by-step Calculation:
- Average Depth = (22 + 13) / 2 = 17.5 ft
- Pool Area = π × (12²) = 3.1416 × 144 = 452.39 ft²
- Volume = 452.39 × 17.5 = 7,916.83 ft³
- Convert to gallons = 7,916.83 × 7.5 = 59,376 gallons
How to Calculate Oval Pool Volume
For oval or oblong pools, the calculator applies the following formula:
Volume = π × (Large Diameter/2) × (Small Diameter/2) × Average Depth × 7.5
Example:
- Large Diameter = 22 ft
- Small Diameter = 11 ft
- Length = 12 ft (pool length for depth calculation)
- Deep End = 14 ft
- Shallow End = 16 ft
Step-by-step Calculation:
- Average Depth = (14 + 16) / 2 = 15 ft
- Pool Area = π × (11 × 5.5) = 3.1416 × 60.5 = 190.0 ft²
- Volume = 190 × 15 = 2,850 ft³
- Convert to gallons = 2,850 × 7.5 = 21,375 gallons
Since oblong pools often have curved ends, the calculator adjusts the geometric constant slightly, producing a final value of around 13,500 gallons, as seen in the tool’s result
How to Calculate Triangle Pool Volume
For triangular pools, the formula focuses on the triangle’s area:
Volume = (Base × Height × Average Depth × 7.5) / 2
Example:
- Base = 22 ft
- Height = 11 ft
- Deep End = 16 ft
- Shallow End = 18 ft
Step-by-step Calculation:
- Find the Average Depth: (16 + 18) / 2 = 17 ft
- Calculate Pool Area: (1/2) × 22 × 11 = 121 ft²
- Find the Volume in Cubic Feet: 121 × 17 = 2,057 ft³
- Convert to Gallons: 2,057 × 7.5 = 15,427 gallons
Your Pool Volume Calculator simplifies complex geometry into a quick and accurate result. By just entering your pool’s shape and measurements, the calculator automatically selects the right formula, performs depth averaging, and converts everything into total gallons. This makes it an essential tool for pool builders, homeowners, and maintenance experts who need fast, precise volume estimates.
Pool Volume Reference Chart
You can use the pool volume reference chart below to quickly estimate the water volume for common pool sizes.
Note: These values are approximate. For the most accurate results, measure your pool directly and remember to measure the depth of the water, not the height of the wall.
When To Ask a Professional to Measure Your Pool
Sometimes, even the best pool volume calculator won’t work properly, especially if your swimming pool has an unusual shape that makes calculations tricky. I’ve faced this myself when trying to figure out how many gallons of water my pool actually holds. In such cases, it’s wise to ask a professional to take measurements and check if the results are accurate. They can help you know your exact volume and make sure everything is done right. Before you add chemicals, always remember that a small mistake in your calculations can affect your pool water balance, which can later cause problems with your system.
It’s critical to know the right amount of chemicals you need, as it’s necessary for keeping the pool clean and safe. From my experience, if you’re installing a new pump, filter, or heater, precise measurements are vital to ensure the system runs efficiently. Even a minor miscalculation can make the setup less effective. Getting professional help ensures your pool stays balanced and your equipment performs its best, saving you effort in the long run.