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"Pool &
Spa
Calculations"
The right calculations are needed to get the right results.
The Pool & Spa Informational Website
askalanaquestion.com |
►
Calculating Water Volume
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Calculating Interior Surface Area
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Metric Conversions
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Scroll down to browse
through some archived SWIMMING POOL & SPA questions and answers.
Please access the Pool Problems Page or Spa Problems Page and other
links, at the top of every page, for additional information.
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The volume of a pool is
important in helping to determine the quantities of chemicals to be added or to
properly size some accessory equipment. While a precise figure is always
best, for most applications a reasonably close approximation will suffice.
In the long term, the amount of chemicals required depends on bather usage,
location, exposure and maintenance practices, as well as the actual pool water
volume. Interior pool
surface area is important to determine the cost of a resurfacing job or the
amount of paint required for a refinishing. For
an alphabetized listing of the entire contents of the website, use the
Table of Contents link, on top of
every page.
One
Of The Products Featured In The Website Stores
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Adhesive Borders
Alarms, Pool & Yard
Aquatic Access Lifts
Aquatic Bike & Treadmill
Aquatic Fitness
Aquatic Training
Cartridge Cleaner
Circulation Booster
Clarifiers, Pool & Spa
ColorQ
Digital Testers
Cracks, Structural Repairs
Deck Sweepers
Electronic Test
Labs
Escape Ramp, Animal
Epoxy Coatings
Great, Must-Have Gadget
Leak Sealer
Magnetic Conditioner
Metals Removal
Misting Systems,
Cooling
Paint, Hybrid-Epoxy |
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Pool Auto-Leveler
Pool Decals
Pre-Filters, Well Water
Robotic Pool
Cleaners
Salt Chlorinator, AGP
Salt
Testers
Sealer for Leaks
Solar Heaters
Spa Cover Spray Protectant
Spa Cover Lifter
Spa-Side Accessories
Stain Treatments
Surface Skimmers
Skimmer Escape Cover
Test
Strips, Pool & Spa
Water Testing
Supplies
Underwater Lights
Vacuums, Automatic
Vacuums, Hand-Held
Water Brooms |
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Click The Image For More
Product & Ordering Information. |
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Swimming Pool
Volumes |
Volume
calculations are subject to reasonable error.
If possible, check with
the builder or retailer.
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Rectangular or
Square Swimming Pools: Volume |

Length (in
feet) X
Width (in feet) X
Average Water Depth (in feet) X
7.5 =
Pool Volume in Gallons (U.S.)
- or -
Length (Meters)
X
Width (Meters) X
Average Water Depth (Meters)
X 1000
=
Pool Volume in Liters
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Circular Swimming Pools:
Volume |

Diameter (in feet)
X Diameter
(in feet) X Average Water Depth (in feet)
X 5.9
= Pool Volume in Gallons (U.S.)
- or -
Diameter (Meters)
X
Diameter (Meters) X
Average Water Depth (Meters)
X
785
=
Pool Volume in Liters
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Oval Swimming Pools:
Volume |

Long Diameter (in feet)
X
Short Diameter (in feet) X Average Water Depth (in feet)
X 5.9
= Pool Volume in
Gallons (U.S.)
- or -
Long Diameter (Meters)
X
Short Diameter (Meters)
X
Average Water Depth (Meters)
X
785
=
Pool Volume in Meters
|
Irregularly
Shaped Swimming Pools: Volume |

If possible check with the
builder or dealer.
You may have to calculate the volume based on two
separate areas, if the pool is an "L" or "T" shape.
For a hexagon or
Octagon shape, calculate as a circular pool.
Otherwise, use the calculations for either an oval or
rectangular pool and substitute an average diameter, width or length.
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Spa or Hot Tub
Volumes |
Volume
calculations are subject to reasonable error, especially if depths vary and
there are contoured surfaces.
If possible, check with the builder or
retailer.
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Rectangular or
Square Spas: Volume |

Length
(inches/inside) X
Width (in inches/inside) X
Average Water Depth (inches) X
0.00434 =
Volume in Gallons (U.S.)
- or -
Length (Meters)
X
Width (Meters) X
Average Water Depth (Meters)
X 1000
=
Volume in Liters
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Circular Spas
or Hot Tubs:
Volume |

Diameter
(inches/inside)
X
Diameter (inches/inside) X
Average Water Depth (inches
X
0.00341
= Volume in Gallons (U.S.)
- or -
Diameter (Meters)
X
Diameter (Meters) X
Average Water Depth (Meters)
X
785
=
Volume in Liters

Long Diameter
(inches/inside)
X
Short Diameter (inches/inside) X
Average Water Depth (inches)
X
0.00341
= Volume in
Gallons (U.S.)
- or -
Long Diameter (Meters)
X
Short Diameter (Meters)
X
Average Water Depth (Meters)
X
785
=
Volume in Liters
|
Irregularly
Shaped Spas: Volume |

If possible check with the
builder or dealer.
You may have to calculate the volume based on two
separate areas, if the pool is an "L" or "T" shape.
For a hexagon or
Octagon shape, calculate as a circular pool.
Otherwise, use the calculations for either an oval or
rectangular pool and substitute an average diameter, width or length.
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Calculating Pool
or Spa
Interior Surface Area |
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The calculations below are
approximations only and are based on average shallow and deep end sizes and
depths.
Pools or spas with atypical measurements may require different amounts. |
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American/English
Units: square feet |
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All
measurements are in feet. |
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Rectangular or Freeform
Shapes: L X W X 1.6 = Square Feet of Interior Surface
-
Oval or Lazy L Shapes:
L X W X 1.65 = Square Feet of Interior Surface
-
Roman Style Shapes: L
X W X 1.55 = Square Feet of Interior Surface
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Metric Units:
square meters |
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All
measurements are in meters. |
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Rectangular or Freeform
Shapes: L X W X 1.6 = Square Meters of Interior Surface
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Oval or Lazy L Shapes:
L X W X 1.65 = Square Meters of Interior Surface
-
Roman Style Shapes: L
X W X 1.55 = Square Meters of Interior Surface
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By calculating the interior
size and knowing the coverage expected from a gallon of paint or finish, the
quantity of paint or finish can be approximated.
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Useful Conversion
Factors |
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LENGTH/DISTANCE |
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Meters |
X |
3.28 |
= |
Feet |
|
Centimeters |
X |
0.394 |
= |
Inches |
|
Feet |
X |
0.31 |
= |
Meters |
|
Yards |
X |
3 |
= |
Feet |
|
Feet |
X |
12 |
= |
Inches |
|
Inches |
X |
2.54 |
= |
Centimeters |
|
Kilometers |
X |
0.62 |
= |
Miles |
|
Miles |
X |
1.61 |
= |
Kilometers |
| |
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WEIGHT |
|
|
|
Kilograms |
X |
2.205 |
= |
Pounds |
|
Kilograms |
X |
1000 |
= |
Grams |
|
Grams |
X |
0.352 |
= |
Ounces |
|
Ounces |
X |
28.34 |
= |
Grams |
|
Pounds |
X |
0.454 |
= |
Kilograms |
|
Pounds |
X |
16 |
= |
Ounces |
| |
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VOLUME |
|
|
|
Liters |
X |
33.824 |
= |
Fluid Ounces |
|
Liters |
X |
1.057 |
= |
Quarts |
|
Liters |
X |
0.264 |
= |
Gallons |
|
Liters |
X |
1000 |
= |
Milliliters |
|
Milliliters |
X |
0.0338 |
= |
Fluid Ounces |
|
Fluid Ounces |
X |
29.57 |
= |
Milliliters |
|
Gallons |
X |
3.784 |
= |
Liters |
|
Gallons |
X |
128 |
= |
Fluid Ounces |
|
Gallons |
X |
4 |
= |
Quarts |
|
Quarts |
X |
2 |
= |
Pints |
|
Quarts |
X |
16 |
= |
Fluid Ounces |
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TEMPERATURE |
| You've seen the formulas for conversion. But you
don't always have a pad and paper handy: let alone a calculator.
Here's an easy way to convert these values.
From ºC to ºF: double
the ºC,
subtract 10%, add 32 and now you have ºF. Example: 30ºC times 2 =
60, minus 10% (-6) = 54, add 32 and you get 86ºF.
From ºF to ºC:
subtract 32, divide in half, add 10% and now you have ºC. Example:
90ºF minus 32 = 58, divide in half = 29, add 10% (2.9) and you get 31.9ºC.
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Proper water chemistry will help to better control and avoid algae problems
and maintain more optimum swimming conditions.
More information about Pool/Spa Water Testing Products can be found in the
Test Equipment Store. |
(Click on any image for ordering and information.)
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