How to use the Pool Volume Calculator?

To get the total volume of a pool you need to enter in the following items:

1. Length: How long is your pool. If it's a custom pool this may be harder to determine so we suggest going from the longest endpoints.
2. Width: Similar to length, the width is the longest point in the pool from one end to another.
3. Shallow End: It's important you measure the amount of water for this calculation and not the height of the pool itself. You should only measure how high it can be.
4. Deep End: Similar to our calculation on shallow end you should calculate from the highest point you see the water.

Pool Volume Calculation Explained

Here is a great tool to calculate the volume or capacity of your pool. Important! Remember to measure from the depth of the water rather than the height of your wall.

More complicated pool shapes will require multiple calculations and adding them together. For more detailed information on the calculations, read more below the calculator. For additional help, contact a swimming pool professional.

Geometric Formulas

A simple method of calculating pool size is the use of geometric formulas. Following are the basic formulas and calculations to determine surface areas:

• Area of a square or rectangle: A = L x W
• Area of a right triangle: A = (L x W)/2
• Area of a circle: A = Pi x r x r

Calculating Volume

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

• Constant Depth Pools: Square or Rectangular - Length x width x depth x 7.5 = volume (in gallons)
• Variable Depth Pools: Square and Rectangular - Length x width x average depth x 7.5 = volume (in gallons)

Measure the length, width, and average depth of the pool, rounding each measurement off to the nearest foot or percentage of one foot.

Circular Pools

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

In measuring the capacity of a circular pool, you might need to calculate two or three areas within the pool and add them together to arrive at a total volume.

Kidney or Irregular Shapes

There are two methods used to calculate the capacity of irregular shapes. First, you can imagine the pool as a combination of smaller, regular shapes. Add these volumes together to determine the total capacity.

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

Parts Per Million (ppm)

One part per million (ppm) represents 8.3 pounds of chemical per million gallons of water.

Pouring one gallon of chlorine into a million gallons of water does not equate to 1 ppm due to their unequal densities. This discrepancy arises from the fact that a gallon of water weighs 8.3 pounds, whereas a gallon of chlorine, in a 15 percent solution, weighs 10 pounds. Consequently, chlorine, being denser, occupies more volume than an equivalent amount of water.