Here is a good tool to calculate the volume or capacity of your pool. Important! psychic to measure up from the depth the the water fairly than the height of your wall.

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More complicated pool shapes will call for multiple calculations and adding them together. For much more detailed information on the calculations, read much more below the calculator. For extr help, call a swimming swimming pool professional.

Capacity calculations involve calculating surface ar area and volume the the swimming pool or spa. This post describes in information how to calculate the size and capacity of the swimming pool you space planning. Calculating a pool"s area in square feet is the very first step in identify information including pool gallons, maximum capacity of persons and also other vital information about your pool.

Geometric Formulas

A simple an approach of calculating pool dimension is the usage of geometric formulas. Adhering to are the simple formulas and also calculations to determine surface areas:

A Area
L Length
W Width
H Height
r Radius
d Diameter
Pi 3.14 constant

Area the a square or rectangle: A = l x W

Area that a best triangle: A = (L x W)/2

Area the a circle: A = Pi x r x r

Calculating Volume

The cubic volume can be calculate by including the depth of the pool with the surface area. For accurate calculations, the pool have to be divided into various areas according come the depth.

Constant Depth Pools: Square or Rectangular

Length x broad x depth x 7.5 = volume (in gallons)

Length time width offers the surface area of the pool. Multiplying that by the depth offers the volume in cubic feet. Because there room 7.5 gallons in every cubic foot, multiply the cubic feet that the swimming pool by 7.5 to arrive at the volume that the pool, expressed in gallons.

Variable Depth Pools: Square and Rectangular

Length x width x median depth x 7.5 = volume (in gallons)

Length time width gives the surface area the the pool. Multiplying the by the median depth provides the volume in cubic feet. Due to the fact that there space 7.5 gallons in each cubic foot, main point the cubic feet the the pool by 7.5 to arrive at the volume that the swimming pool (expressed in gallons).

Measure the length, width, and average depth that the pool, round off each measurement turn off to the nearest foot or portion of one foot. One inch equals 0.0833 feet. Therefore, main point the number of inches in your measurements by 0.0833 to obtain the proper percentage of one foot.

Example: 25 ft, 9 in. = 25 ft + (9 in. X 0.0833)

= 25 + 0.75

= 25.75 ft

If the shallow end is 3 feet and also the deep finish is 9 feet, and assuming the steep of the pool bottom is gradual and even, climate the mean depth is 6 feet.

Average depth = ( Depth in ~ the shallow end + Depth at the deep finish ) / 2

Average depth = ( 3 + 9 ) / 2 = 6 feet.

If most of the pool is just 3 or 4 feet and then a little area drops off unexpectedly to 10 feet, you will have a different average depth. In together a case, you can want to treat the swimming pool as 2 parts. Measure the length, width, and average depth of the shallow section, then take the same dimensions for the deeper section. Calculate the volume of the shallow ar and include that to the volume you calculate for the depths section.

Make certain to usage the yes, really water depth in her calculations, not the depth of the container. Because that example, the hot tub depicted in figure 2 is 4 feet deep, yet the water is just filled to around 3 feet. Making use of 4 feet in this calculation will result in a volume 33 percent better than the actual lot of water. This could mean significant errors when adding chemicals because that example, which are administered based on the volume the water in question. There can be a time once you desire to know the potential volume, if filled come the brim. Then, that course, girlfriend would use the yes, really depth (or average depth) measurement. In the example, the was 4 feet.

Length x width x median depth x 7.5 = volume (in gallons)

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

Circular Pools

The formula: 3.14 x radius squared x average depth x 7.5 = volume (in gallons)

The number 3.14, refers to pi, which is a mathematical constant. The radius is one-half the diameter, so measure the distance across the broadest part of the circle and divide the in fifty percent to arrive at the radius. Squared method multiplied through itself, so multiply the radius by itself. Because that example, if you measure the radius together 5 feet, multiply 5 feet by 5 feet to come at 25 feet.

Use the hot tub to calculate the volume of a ring container. Let"s do the tricky part first. The diameter of the bathtub is 10 feet. Fifty percent of that is 5 feet. Squared (multiplied by itself) means 5 feet times 5 feet equates to 25 square feet. Understanding this, you can return come the formula:

3.14 x radius squared x median depth x 7.5 = volume (in gallons)

3.14 x 25 ft x 3 ft x 7.5 = 1766.25 gallons

In measure up the volume of a circular spa, you can need come calculate two or three areas within the hot tub and add them with each other to arrive at a full volume. An north circular hot bath tub looks like an upside-down wedding cake, since of the seats. Therefore, you might want to treat it together two different volumes-the volume over the seat line and the volume below. In the wooden warm tub, wherein there is actually water above and listed below the seats, the bath tub can be measured together if there are no seats because this difference is negligible.

Kidney or rarely often, rarely Shapes

There room two methods used to calculation the volume of irregular shapes. First, you can imagine the pool or hot tub as a combination of smaller, regular shapes. Measure these miscellaneous areas and also use the calculations described previously for each square or rectangle-shaped area and also for each circular area. Include these volumes with each other to determine the total capacity.

0.45 x (A+B) x size x median depth x 7.5 = volume (in gallons)

The full of measure A plus measurement B multiply by 0.45 multiply by the length provides you the surface ar area that the kidney shape. (A + B = 18 feet). The remainder of the calculations you are now acquainted with. Try this volume calculation:

0.45 x (A+B) x length x typical depth x 7.5 = volume (in gallons)

0.45 x 18 ft x 25 ft x 5 ft x 7.5 = 7593.75 gallons

Parts every Million (ppm)

One of the most necessary calculations friend will use is components per million (ppm). The amount of solids and liquids in the water is measure in components per million, together in three parts of chlorine in every one million parts of water, or 3 ppm.

To help, this list shows common terms and their equivalents:

Square foot (sq. Ft.) = 12 inch large x 12 inch long

Cubic foot (cu. Ft.) = 12 inch wide x 12 inch long x 12 customs high

Cubic yard (cu. Yd.) = 36 inch large x 36 inch lengthy x 36 customs high

One cubic foot the water consists of 7.48 gallons

One cubic foot of water weighs 62.4 pounds

One gallon of water weighs 8.33 pounds

One part per million (ppm) to represent 8.3 pounds that chemical per million gallons the water.

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However, one gallon that chlorine, for example, poured into one million gallons the water does not equal 1 ppm. That is since the two liquids room not of same density. This becomes obvious since a gallon that water weighs 8.3 pounds yet a gallon the chlorine weighs 10 pounds (in a 15 percent solution). The chlorine is a denser liquid; there"s an ext of it 보다 an equal volume of water.