Pool Calculator – Water Volume, How Many Gallons, Math, Size, How to Calculate, And More (2021)

The pool is the best way to save yourself from the scorching heat of the sun and have fun with your family.

The pool comes with a lot of perks, but it needs maintenance, and if the water is not blue, it needs cleaning

Dirty pools are what anyone would not like to step into, and you cannot imagine algae sticking on your body.

In the 21st century, we have a solution to all the problems.

To clean your pool, there are different tools and chemicals for the most effective results.

If calculations go wrong, this cleaning could turn into a disaster.

To avoid such a problem, using a pool calculator to obtain correct measurements and calculate water volume, in gallons, is the best available option.

This will require you to fill in the dimensions of the pool to get the pool volume, which will vary with different shapes of the pool.

Once you fill in all the details right, the pool calculator will give you the exact volume, in gallons, of your pool.

Pool calculator – Basics

Pool calculator

Shapes of pool

Before using a pool volume calculator for your pool, you need to know what exactly the shape of your pool is.

Usually, there are five pool/spa shapes.

What are they?

Well, they are rectangular, oval, elliptical, circular, and arc-shaped.

At times, you can get to see ranges of shapes of the pool/spa because geometry allows us to do that.

In that case, you need to use a pool volume calculator for uncommon shapes as they will require complex calculations.

Pool volume calculator dimensions

Before calculating the volume, in gallons, of your pool water for chlorination, you need to know the dimensions of your pool.

Common dimensions which you will require are as follows:

  • The length is the measurement of the pool on a horizontal surface, and it is larger than the width or breadth.
  • The depth or height of the pool is also required to calculate the volume.

While measuring the dimensions, accuracy has to be determined.

Especially when measuring depth, make sure that if your pool has a deep end and a shallow end, then both have to be measured to calculate the average depth.

Measuring all the dimensions correctly is necessary to get the volume/liters measurement right, and the chemical products you will require for cleaning.

The more accurate the measurements of length, width, end depth, and the water volume calculator is, the more perfect your cleaning will be.

Trouble free pool – Techniques/Tips to Improve

Best time to shock your pool

Some sources would suggest you shock the pool anytime.

However, that is not appropriate.

You need to shock the pool at night, or during sunset.


Well, the shock gets degraded due to sunlight.

Therefore, its effect on the volume reduces.

How many gallons is my pool – Get the dimensions right

Pool calculator-Get the dimensions right

To get the overall volume, in gallons, correct, all the dimensions need to be accurate. Always measure the length, width, shallow end, and deep end with a properly marked measuring tape.

Remember, you need to measure both the deep end and shallow end to work out the average depth in order to arrive at the correct volume, in gallons, of the pool.

While calculating the average depth, measure the deep end and shallow end from the bottom line of the pool to the level of water and not the wall.

Pool gallon calculator common problems

Excessive Chlorine

While chlorine is great for keeping your pool clean from algae, an excessive amount can lead to serious problems if the balance is incorrect in relation to the volume capacity.

If you get severe eye irritation or find it difficult to see underwater, you may have too much in your pool.

The best way to know how much is in your pool is by measuring it and making sure those levels remain consistent.

Pool math calculations

When we do the math with all the measurements to calculate the volume capacity, there is a high chance of doing it wrong.

Measuring the length, width, end depth for shallow and deep ends, average depth, and pool volume in gallons can be complex to calculate.

By using a pool calculator for the task it will make the job easier when it comes to arriving at the correct volume figure.

Time to clean your pool

An untreated pool can lead to irritability in the eyes, throat, ears, skin, and more.

Why does that happen?

Well, it usually happens due to the PH imbalance in the volume of gallons of water.

You may wonder why PH imbalance happens.

There are various reasons for that.

However, one reason is a combination of chlorine and ammonium per the volume of water.

It can even happen due to debris in the pool and differences in the average depth.

Therefore, you will have to clean the pool frequently.

Try to use tools that can lead to efficient cleanings, like filters and skimmers.

You need to make sure that the PH level remains at 7.5 approximately.

Gallon Calculator Frequently Asked Questions

How many gallons is my pool calculator?

Have you ever wondered why you were taught mathematics in school?

Well, this answer will tell you the exact reason.

To know the number of gallons in the pool, you will have to use the powerful tools of mathematics to calculate the volume or capacity of it.

These tools were taught to you in school.

Forgot them?

No worries.

If you want to know the number of gallons in the pool, then you will have to go back to basic mathematics.

A swimming pool is a three-dimensional space.

It has length, width, and height/depth.

If there is a deep part and shallow part, you will need to work out the average depth.

You can arrive at the average depth by measuring both, adding them together and dividing by two.

To know the number of gallons of water in it, you will have to figure out the pool volume based on the average depth, length, and width.

However, the method to calculate the length, width, and volume and the number of gallons it holds depends a lot on the shape of your swimming pool.

Different swimming pools have different shapes and the average depth varies.

Therefore, as per the length and shape of the pool, you will have to apply the formulae of basic geometry.

Make sure that you measure the pool dimensions accurately: length, width, height, and average depth.

This will help you to calculate the precise gallons of water in the pool.

How do you calculate pool chemicals?

First of all, you need to know that there are two basic ways to work out which pool chemicals you need.

One is to work it out manually.

In this method, you mix the water with various chemicals and calculate the results through basic chemistry.

This method can be extremely complex if you are not experienced with chemistry as a subject.

We would never recommend you to follow some formulae to calculate the pool chemicals.

Is there a better alternative, especially as a beginner?

Yes, there is one.

It is the second basic method to work out the pool chemicals needed.

In the method, you will have to depend a lot on technology.

Exactly, you will have to use a pool testing kit.

Make sure that you choose the top brands of pool testing kit.

They will offer accurate readings and they are durable.

How much bleach do I need to shock my pool calculator?

Alright, so, you want to shock the pool.


Pool shocks are a great way to balance the water chemistry irrespective of the volume.

What are they?

Well, these chemicals can increase the level of chlorination in the pool.

One example of a pool shock is bleach.

They are usually required if the levels are low, which can lead to various conditions like cloudy water.

Of course, you can top up chlorine-levels in the water to balance the water chemistry.

However, using a pool shock is much more effective.

How much should you add?

This completely depends on the present condition and volume of the water.

Let us say that the chlorine-levels are extremely low.

In that case, you will have to add a lot of pool shock.

On the other hand, if the deficiency is low, then you need to add a small amount.

Moreover, you must keep the PH in mind while adding the shock product.

Observing the PH is a great way to determine the correct quantity of shock to use.

You must make sure that the PH remains approximately 7.5.

Let us say that the PH exceeds this limit.

What should you do?

In that case, you must add sodium bisulfate to lower it.

Yes, this method is not accurate.

Therefore, you must follow some calculations.

Let’s assume that you have a volume of 30,000 gallons of water.

To increase the chlorine-level by one ppm, you will have to add half a gallon of a shock.

Thus, a 5-gallon shock will increase the ppm by 2.5.

How to evaluate the quantity of chlorine which I should put in a 1000-gallon pool?

The elementary balance of chlorine to water is between 1 and 3 parts per million.

Therefore, for 1000 gallons of the pool, you will need to increase the chlorine-level reading by 0.13.

Water volume calculator best practices

When you have calculated the volume using a calculator pool owners recommend and figured out everything related to the chlorination of your pool.

It is recommended to call a professional to do the job to avoid any serious problems.

Always use chemicals from a certified brand.

Make sure that the packet you buy is the one to be used for cleaning pools.

Poolcalculator Tools You Can Use:

You can use a skimming net to clear off all the debris from your pool.

The PH level has to be measured in the pool, and for that, you can use a PH tester kit available at your local supermarket.

Use a calculator pool owners recommend to measure the volume of your pool.

A measuring tape can be used for measuring all the dimensions needed.