Welcome to PoolAndSpa.com We Bring The
World Of Pools And Spas Right To Your Front Door !
Swimming Pool And Hot Tub Parts & Supplies, How-To Articles &
Videos
Friday, November 17, 2017

The World's
Oldest & Largest Web Site For Swimming Pool & Hot Tub Spa Owners
With Over 5000 Pages Of Information, Parts And Supplies Celebrating Our 23rd Anniversary On The Internet. 1994
~ 2017

How Many
Gallons Of Water Are In My Swimming Pool?

How Much
Water Is In My Pool?

Why Do I
Need To Know This, And How Do I Figure It Out?

In order to figure out the proper
doses of many chemicals for your pool, you often need to determine
approximately how many gallons of water it holds. Also
when adding a Pool Heater, Heat Pump or Solar Heater to
your pool, you will also need to know how many gallons
you are dealing with.

To do that, you need
to use a ruler to measure your pool to find out these
four different numbers; Length, Width, Diameter (for
Round Pools), Average Depth and
then use a Fixed Volume Multiplier to determine the
approximate number of gallons the pool holds.

If you have never
done this before, don't worry. We will walk you through
the detailed steps below.

I Know
What I'm Doing. Just Tell Me The Formulas.

If you don't
need a detailed tutorial, and you already know your
measurements, and how to calculate average depth, here
are the quick formulas for you to use on your own
calculator.

Formula For Average Gallons In
Rectangle, Square Or Freeform Pools:

Length x Width x Average Depth x 7.5 = Total
gallons

Formula For Average Gallons In
Circular Pools:

Diameter x Diameter x Average Depth x 5.9 =
Total gallons

Formula For Average Gallons In Oval
Pools:

Length x Width x Average Depth
x 5.9 = Total gallons

Formula For Average Depth Of Pools With Slopes:

Shallow End Depth + Deep End Depth Divided by 2 =
Average Depth

Well, I Have The Basic
Measurements, So Can You Just Figure It Out For Me?

Absolutely.
You can use the E-Z Pool Water Calculator below to get
the approximate number of gallons in your pool.

Tips:

1- Length And Width are for rectangle, squares or ovals.
It is best to use whole numbers, rounded up. For
example, if the pool is 16 1/2 feet wide, use 17 feet as
the width.

2- Put the Diameter in the Length And Width fields for
Circular pools. It is best to use whole numbers, rounded
up. For example, if the pool is 21 1/2 feet in diameter,
use 22 feet as the diameter.

3- For the Average Depth, it is best to use whole
numbers, rounded up. For example, if the Average Depth
is 5 1/2 feet, use 6 feet as the Average Depth.

3- Use the Gallon Multiplier of 8 for rectangles or
squares for best results.

4- Use the Gallon Multiplier of 6 for Circular or
Ovals for best results.

E-Z Pool Water Calculator For
The Approximate Number Of Gallons Of Water In Your Swimming Pool

Length =X
Width =X
Average Depth =X Gallon
Multiplier =

The Approximate
Gallons Of Water In Your Pool Is =

I Know
Nothing. Please Walk Me Through The Whole Process.

If you know
nothing, don't worry!
Most people have never done this before. So we will show
you the easiest and best way to measure your Pool.

Remember, No One
Expects You To Be 100% Exact. Just Do The Best You Can.

Please realize that you are never going
to be 100% accurate due to calculated pool water gallons
(volume) are an approximate value due to the variations
in the sizes, distances and angles of the various pool
shapes and slopes.

Also a pool can be filled "to the top"
and can also only be filled only "X" amount of inches
from the top. For example, a huge rain storm can raise
the water level in a pool by a few inches over night, as
many people have seen all too often. And a few inches
(up or down) will change the "exact" number of gallons
in any pool potentially hundreds or thousands of
gallons, depending on the overall size of the pool.

So don't worry. And don't get too hung
up on being overly exact, just do the best you can with
your measurements.

What Do I
Need To Measure, And How?

You can easily measure the Length, Width
and Diameter (if Round) of any swimming pool with a
typical ruler. Write down those measurement, generally
to the nearest foot will be good enough.

Now You're
Gonna Need To Get The Average Depth of the Pool

If you are lucky enough to have an Above
Ground Pool, or some Inground Pools where the entire
bottom is one Depth, it is very easy to figure out the
Average Depth. It is just the Depth of the water.
Measure it and write down that number.

However, most Inground Pools, and many
newer Above Ground Pools have varying Depths, usually
with angled Slopes going from level to level. This makes
getting an Average Depth a bit more difficult.

How to determine the Average
Depth of a Swimming Pool where the bottom slopes:

Below is a side-shot of the "typical"
inground pool that has a shallow end (see "D"), then a
slope that leads into the deep end (deep end is "C").

If you have a long firm ruler, use that to take your
measurements for the Depths. If you have a ruler, but it
isn't very firm, or long enough, just use your vacuum
pole to mark the depths of the pool with a simple piece
of tape (or magic marker) on the pole. Then just take
your measurements off the vacuum poll with your ruler.
Again, you just really need the gist, don't get too hung
up on an inch or two either way. Usually measurements
like 3', 4', 6, 8', etc. are good enough.

First measure the depth of "D", the shallow end
(usually anywhere from 3' to 5'), and then measure
the depth of "C", the deep end (usually anywhere between 6' and 12').
Then, add them together and divide by 2. This is the Average
Depth of your pool.

For example, if your shallow end "D" is
4', and your deep end "C" is 8', this would be your
formula for the Average Depth:

Formula For Average Depth Of Pools With
Slopes:

Shallow End Depth + Deep End Depth Divided by 2 =
Average Depth

Example:

Shallow End = 4' + Deep End = 8', For A Total Of = 12'

12' divided by 2 = 6'

Therefore, in this example, your Average Depth would
be 6 feet.

So here are the actual formulas to
figure out how much water is in your swimming pool

These formulas hold
true for both Inground pools as well as above ground
pools.

Rectangular, Square or Free
Form Pools:

Formula For Average
Gallons In Rectangle, Square Or Freeform Pools:

Length x Width x Average Depth x 7.5 = Total
gallons

For example: 16' x 32' x 4.5' x
7.5 = 17,280 Gallons

Circular
Pools:

Formula For Average
Gallons In Circular Pools:

Diameter x Diameter x Average Depth x 5.9 =
Total gallons

For example: 18' x 18' x 4' x 5.9 = 7,646 Gallons

Oval
Pools:

Formula For Average
Gallons In Oval Pools:

Length x Width x Average Depth
x 5.9 = Total gallons

For example: 15' x 30' x 4' x 5.9 =
10,620 Gallons

So Now,
Scroll Back Up On This Page To The E-Z Pool Water
Calculator And Give It A Try!

Just take your newly discovered
measurements for Length, Width, (Diameter if Round), and
Average Depth - and plug those numbers into the E-Z Pool
Water Calculator and see how much water is in your pool.
It's that easy!

Blah,
Blah, Blah. I Really Don't Have Time For All Of This.
Can You Just Cut To The Chase?

If you just
don't care that much about knowing the "exact" amount of
water in your pool, you are in luck! We have created some
handy charts
of the most popular sized Pools, and their Average
Gallons of water. These charts are generally accurate
enough for most residential uses.

Most
Common Sizes Of Inground Rectangular Pools And How Many
Average Gallons They Contain

POOL SIZE

4' AVG. DEPTH

5' AVG. DEPTH

6' AVG. DEPTH

12' X 24'

8,640

10,800

12,960

14' X 28'

11,760

14,700

17,640

15' X 30'

13,500

19,900

20,250

16' X 32'

15,400

19,200

23,040

18' X 36'

19,400

24,300

29,160

20' X 40'

24,000

30,000

36,000

25' X 45'

33,750

42,187

50,625

25' X 50'

37,500

46,900

56,250

30' X 50'

45,000

56,250

67,500

Most
Common Sizes Of Above Ground Pools And How Many Average
Gallons They Contain