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How To Calculate Pool Volume

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Formulas Behind Pool Calculator

How to calculate the volume of a rectangular swimming pool

So you no longer need to worry “how many gallons is my pool?”, simply apply one of the formulas:

  • Rectangular / square pool
  • volume = length * width * / 2

    The first two agents is, of course, the formula for the area of the rectangle.

  • Oval / circle pool
  • volume = * / 2

    The first part of the equation comes from a standard area of an ellipsis formula: A = * a * b, where a, b are the distances between the center and the ellipse’s vertex, lying on the horizontal and vertical axes. In our case, we have the length and width values that are the doubled distances a and b, so in the final formula, we need to divide the surface area of an oval by 4.

    You are wondering why we average the depths / 2? Have a look at the pictures:

  • Here you have the standard rectangular pool. l stands for the length of the pool, w for width, d1 is depth on one end of the pool and d2 is the depth on the other end.
  • Let’s take the right trapezoidal side of the pool. “Cut” the triangle, with one apex in the midpoint of the side, as in the picture.
  • Flip and move it to the other side to form a rectangle. The edge of the new shape is the average of two sides, so
  • / 2.

    The area of such a rectangle is then length * / 2. Multiply it by the third dimension – the width – and you’ll get the final formula for rectangular pool volume:

    • volume = length * width * / 2

    Above Ground Pools With 52

    Pool Size and Shape
    < 20,200

    Whether you have a large 30,000 gallon pool, or a small swimming pool with less than 10,000 gallons, knowing your pool size will help you keep your pool water perfectly balanced. If you need help determining the size of your swimming pool, or what chemicals to add to your pool, contact Dohenys pool pros at 800-574-7665, or visit us online at doheny.com.

    Next Day Delivery Details

    Dohenys is pleased to offer free next day delivery at no additional charge for orders over $100 to most of the US for all Doheny’s brand chemicals and many of our most popular swimming pool supplies. Next Day Delivery Service does not mean Next Day Air, but simply that your qualifying products will be shipped from the warehouse closest to you resulting in delivery the next day. We do have a shipping charge of only $9.99 for orders under $100.00.

    Some details regarding this service:Other than for Pleasant Prairie, Wisconsin, not all products are stocked at all locations and therefore not available for next day delivery. Only those items with a Next Day Delivery designation on the product page can be expected to arrive the next day and orders must be placed by 3 PM local time .

    If you reside in the next day delivery area served by our Pleasant Prairie facility, order in-stock products and place your order by 3 PM Local Time you should receive your order the next day . This applies to products even if they do not have a Next Day Delivery designation.

    Because next day delivery is not guaranteed for standard service and residential deliveries are made only Monday through Saturday though Saturday delivery is not guaranteed, there is a chance that our product will not arrive the next day. While we try our best, unexpected demand can cause products to occasionally be out of stock or create a warehouse backlog that also can prevent shipment the day of the order.

    Also Check: Hanby Pool

    Variable Depth Pools: Square And Rectangular

    Length x width x average depth x 7.5 = volume

    Length times width gives the surface area of the pool. Multiplying that by the average depth gives the volume in cubic feet. Since there are 7.5 gallons in each cubic foot, multiply the cubic feet of the pool by 7.5 to arrive at the volume of the pool .

    Measure the length, width, and average depth of the pool, rounding each measurement off to the nearest foot or percentage of one foot. One inch equals 0.0833 feet. Therefore, multiply the number of inches in your measurements by 0.0833 to get the appropriate percentage of one foot.

    Example: 25 ft, 9 in. = 25 ft +

    = 25 + 0.75

    = 25.75 ft

    If the shallow end is 3 feet and the deep end is 9 feet, and assuming the slope of the pool bottom is gradual and even, then the average depth is 6 feet.

    Average depth = / 2

    Average depth = / 2 = 6 feet.

    If most of the pool is only 3 or 4 feet and then a small area drops off suddenly to 10 feet, you will have a different average depth. In such a case, you might want to treat the pool as two parts. Measure the length, width, and average depth of the shallow section, then take the same measurements for the deeper section. Calculate the volume of the shallow section and add that to the volume you calculate for the deeper section.

    Length x width x average depth x 7.5 = volume

    25.75 ft x 10 ft x 6 ft x 7.5 = 11,587.5 gallons

    Round Kidney And Irregular Pools

    Pool Volume Calculator

    If your pool is round or circular, multiply the radius by itself . Multiply that total by the average depth of the pool, then multiply by 3.14 .

    For more irregular shapes, you will need to split the pool into sections, calculate the surface area of each section, and then add them together. For example, for a kidney-shaped pool, you can calculate the surface area of a rectangular section in the center and then treat the two semicircles at the ends as one circle. Once you have done that, multiply the total surface area by the average depth. With irregular shapes, you have to get creative, but our Pool Water Volume Calculator can save you a great deal of trouble.

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    How To Calculate The Volume Of Water In Your Pool

    It is important to know the volume of water in your pool to facilitate its maintenance. This allows you to choose the right filtration system, the right cleaning robot, the right heat pump to heat your pool and the right quantity of cleaning products to use.

    The volume of water is calculated in cubic meter and can be easily converted to liters. For example, a pool of 1 m3 = 1000 liters of water. We suggest that you round up your figure. For example, 1.1m3 would become 2m3 or 1.7m3 would also become 2m3 .

    Precision for height measurement you should measure from the bottom of the pool to the surface of the water and not up to the height of the pool.

    If you have a pool with different depths, take the smallest measure + the largest measure and divide into 2. You will have the average depth.

    Is It Okay To Run A Pool Pump 24 Hours A Day

    Definitely! A pool pump running 24/7 will use up a lot more electricity, so your utility costs will bump up each month. However, from a filtration perspective, an endlessly running pool pump will keep your pool crystal clear.

    Some believe that one turnover per day is enough when paired with regular pool maintenance. The pump that you need will ultimately be determined by whether you agree or disagree. Increased filtration will undoubtedly decrease pool issues and make pool maintenance a bit easier. On the downside, it will also increase the cost.

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    Olympic Swimming Pool Volume

    To calculate the Olympic swimming pool volume, you need to know its dimensions. The length of the pool is 50 m, width 25 m, and the depth varies: 2.0 m is the minimum, but 3.0 m is the recommended depth. If you’re not familiar with those metric units, check out this length converter to convert easily the pool size to US or imperial units.

    Olympic-size swimming pool contains 2,500,000 L of water, assuming a nominal depth of 2 m. It’s around 550,000 imp gal and 660,000 US gal – if you don’t believe us, you can check it with our volume converter tool, where you’ll find other volume units as well. Try to calculate the Olympic swimming pool volume for a recommended depth of 3 meters – or use the pool calculator to get the answer in the blink of an eye.

    Have you ever wondered how many tea- or tablespoons of water can fit into the Olympic swimming pool? We haven’t either. But now you can check it! Awesome, isn’t it?

    How To Calculate Oval Pool Volume

    How To Calculate Pool Volume

    You can calculate the volume of an oval swimming pool by multiplying the length times the width in feet times 3.14 divided by 4 times average depth in feet times 7.48. The formula is:

    volume = length × width ×÷ 4 × depth × 7.48

    The first part of this formula determines the area, and multiplying by the depth finds the volume. Again, multiplying by 7.48 determines how many gallons of water are in the pool.

    Like a rectangular pool, the average depth can be found by adding the shallow and deep depths and then dividing by 2.

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    How Do You Determine The Maximum Occupancy Of A Pool

    There are several guidelines and formulas to use when youre trying to determine the maximum occupancy of your swimming pool. For some codes, you would have to consider the recirculation flow rates for each swimmer. For other codes, the maximum occupancy depends on whether you have an outdoor, indoor, deep-end or shallow pool.

    Another consideration to think about is the size of any decks which surround your pool or if your pools has diving boards, water slides, and other special equipment. As a pool operator, you must first learn about the health codes for you to use the correct formulas and so that you can adhere to the standards of the pool you have chosen.

    Generally, though, if your locale doesnt specify these guidelines, you can use the following:

    • One person per 15 ft2 of surface area in parts of the swimming pool which are 5-ft in depth or less.
    • One person per 20 ft2 of surface area in parts of the swimming pool which are 5-ft in depth.
    • If your pool has a diving board, subtract 300 ft2 from the total value of the surface calculations.

    For instance, if the shallow part of your swimming pool is 40 ft x 20 ft, that would be equal to 800 ft2. Using the first guideline, you can calculate the maximum number of persons for this part of the pool:

    800 / 15 = 53 people

    2900 / 20 = 145 people

    Now, all you have to do is add these two values to get the total maximum occupancy of your pool. In our example, this is:

    53 + 145 = 198 people

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    Basic Formulae To Use When Calculating Pool Volume

    Here are the formulae you will be using here:

    Area of a Rectangle or Square: A = L × WArea of a Triangle : A = ÷ 2Area of a Circle: A = Pi × r2Volume: V = Area x Depth

    Since youre dealing with feet, your pool volume will be in a cubic foot. You will need to convert the value to gallons the most used capacity unit in pool care.

    One cubic foot of water equals approximately 7.5 gallons. That means, to get how many gallons of water your swimming pool holds, you need to multiply the pool volume in cubic feet by 7.5.

    Volume x 7.5 = Volume

    Calculating the Volume of Rectangular or Square Pool

    Rectangular or square-shaped pools are of two types:

    • With uniform depth
    • Variable depths and gradual slope

    The formula and method of calculating their volumes are different.

    With Constant Depth

    If your swimming pool has one uniform depth, measure its length and width. Multiply the two to find its surface area. Measure the depth and multiply it with the surface area to get its volume in cubic feet.

    If there no markings of how deep the pool is, which is rare, you can use your leaf net telescope pole to mark how deep the pool is and then use a tape measure to measure the distance between the markings.

    Length × Width = Surface Area Area x Depth × 7.5 = Volume

    In an example: Assuming your swimming pool is 40 feet long, 20 feet wide and 3.5 feet, its volume would be:

    40ft x 20ft = 800ft22800ft3 x 7.5 = 2100 GallonsOr40ft x 20ft x 3.5ft x 7.5 = 2100 Gallons

    With Variable Depths and Gradual Slope

    How To Use The Pool Volume Calculator

    Pool Volume Calculator

    \This pool volume calculator or pool size calculator is a handy tool for you to use when you need to find out how much water you need to fill up your pool. Instead of calculating the volume by hand, this online tool does the work for you in an instant. Here are the steps for you to follow for this how many gallons is my pool calculator:

    • First, choose the shape of your pool from the drop-down menu.
    • Then enter the value of the Width and choose the unit of measurement from the drop-down menu.
    • After that, enter the value of the Length and choose the unit of measurement from the drop-down menu.
    • Then enter the value of Depth 1 and choose the unit of measurement from the drop-down menu.
    • Finally, enter the value of Depth 2 and choose the unit of measurement from the drop-down menu.
    • After entering all of these values, the calculator automatically generates the value of the Pool Volume for you.

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    Round Or Circular Pool Volume

    The formula for finding the volume in gallons of a round pool is 3.14 × r2 × D × 7.5 = V

    Start by measuring your pools diameter, which is measured at its widest point across . Then divide the diameter by 2 to get the radius.

    Your radius squared is the radius multiplied by the radius. Finally, measure the pools depth.

    For example, if your pools diameter is 18 feet, your radius is 9 feet, and your depth is 4 feet:

    • 3.14 × × 4 x 7.5 = 7630.2 gallons

    How Many Gallons Is My Pool

    Let’s calculate it with this pool volume calculator!

  • Choose the shape of your pool. You can select between two types – rectangular/square pool or oval/circle one. Our example is with a standard rectangular pool, so leave the default value.

  • Enter the dimensions of the swimming pool. Let’s say that the pool is 12 ft wide and 50 ft long. Depth is gradually changing from 4 to 6 feet.

  • The pool calculator shows the volume of water needed to fill up the pool. In our case, it’s 22,441.57 US gallons.

  • Our tool is sometimes called the pool size calculator or pool gallon calculator because it works with any units, not just with metric. If we didn’t auto-detect your preferred units, click on meters to change it to gallons.

    If your pool doesn’t vary in depth, but is some kind of a fancy shape like bow front or cylinder, check out this aquarium calculator – it has some nice options for different 3D shapes. If the pool of your dreams comes in some custom or eccentric shape, check out the manufacturer’s website.

    Advanced mode:

    This calculator finds the total volume of your pool – in reality, you never fill the pool all the way to the brim. Also, you may want to have a look at our other tool associated with submerged objects and their volume and weight – the buoyancy calculator.

    Recommended Reading: Pool Water Chemical Calculator

    When To Ask A Professional To Measure Your Pool

    If the swimming pool volume calculator or calculations dont work properly for you because you have an unusual pool shape, or you just want everything to be more accurate, ask a pool professional to take the measurements and figure out the volume for you.

    Remember, before you add any chemicals to your pool water, you need to know how many gallons of water are in your pool. Knowing your pool volume is not only critical for adding the right amount of chemicals, its absolutely necessary if youre installing a new pool pump, pool filter, or pool heater. And keep these calculations handy for future reference. Youll need them often as a pool owner!

    How To Properly Measure The Depth Of Your Swimming Pool

    how to calculate the volume of a circular pool or cylinder

    When measuring the depth of your pool, it is is important to measure the depth of the water, and NOT the distance from the bottom of the pool to the top of the pool container. Measuring to the top of the pool container can add a significant error, especially if the distance from the top of the water line to the top of the pool or spa is large.

    Read Also: How Many Btus Do I Need To Heat My Pool

    How To Compute Volume Of A Square Or Rectangular Pool

    You can get the volume in litres of a square or rectangular pool by multiplying the length by the width and the average depth then multiplying the result by 28.31. To get the average depth of your pool, take the depth of the shallow end of your pool and add it to the depth of the deep end, and divide by two. Heres a quick example. Lets say the shallow end of your pool is 3 feet deep and the deep end is 7 feet deep. Add those two together 3 feet +7 feet =10 feet. Divide that by 2, what youll end up with is having an average depth of 5 feet.

    For Example:

    The pool is 30 feet long, 15 feet wide, and has an average depth of 5 feet.

    The formula for that would look like:

    x 28.31 litres

    So thats 2,250 cubic feet x 28.31 litres

    So this particular pools volume would be 65,947.5 liters give or take a few.

    Length x Width x Average Depth x 28.31 = Volume in litres

    For Calculator Use: Take note of these numbers.

    Length, Width, Shallow end depth, and Deep end depth

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