For example, if you measure the radius as 5 feet, then multiply 5 feet by 5 feet to arrive at 25 feet. Squared means to be multiplied by itself, so you will multiply the radius by itself. Measure the distance across the broadest part of the circle and divide it in half to get the radius. The number 3.14 refers to pi, which is a mathematical constant. The formula: 3.14 x radius squared x average depth x 7.5 = volume (in gallons) Then, of course, you would use the actual depth (or average depth) measurement. There might be a time when you want to know the potential volume, if filled to the brim. This could mean serious errors when adding chemicals for example, which are administered based on the volume of water in question. Using 4 feet in this calculation will result in a volume 33 percent greater than the actual amount of water. Take extra precaution to ensure that you use the actual water depth in your calculations (not the container depth).įor example, the hot tub depicted in Figure 2 is 4 feet deep, but the water is only filled to about 3 feet. Lastly, calculate the volume of the shallow part and add that to the volume you calculate for the deeper part. Then use the same measurements for the deeper section. First, measure the length, width, and average depth of the shallow section. In this case, you may need to divide the pool into two separate parts. If most of the pool is only 3 or 4 feet and a small area drops off to 10 feet, you will have a different average depth. Average depth = (Depth at the shallow end + Depth at the deep end) / 2 Average depth = (3 + 9) / 2 = 6 feet. 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. Therefore, multiply the number of inches in your measurements by 0.0833 to get the appropriate percentage of one foot.Įxample: 25 ft, 9 in. Measure the length, width, and average depth of the pool, rounding each measurement off to the nearest foot or percentage of one foot. Since there are 7.5 gallons in each cubic foot, multiply the cubic feet of the pool by 7.5 to determine the volume of the pool (expressed in gallons). Then multiplying that area by the depth will give you the volume in cubic feet. To reach the surface area of the pool you will need to multiply the length and the width. Length x width x average depth x 7.5 = volume (in gallons) Variable Depth Pools: Square and Rectangular Since there are 7.5 gallons in each cubic foot, multiply the cubic feet of the pool by 7.5 to determine the volume of the pool, stated in gallons. Length x width x depth x 7.5 = volume (in gallons) Constant Depth Pools: Square or Rectangular For precise calculations, it is recommended that pool be divided into various areas according to the depth. Including the depth of the pool with the surface area will determine the cubic volume.
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