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Pool and Spa Calculations

The right calculations are needed to get the right results.
 
The Pool and Spa Informational Website
askalanaquestion.com

Calculating Water Volume
Calculating Interior Surface Area
Metric Conversions
 

 
 

Scroll down to access some easy-to-use calculations, for determining pool or spa volumes, in a gallons or liters.  Information is available to help calculate the interior surface area, which helps determine the amount of paint or coating required.  The right information helps assure a better outcome.  Please click the Pool Problems Link, on top of every page, to access a complete listing of Pool Problem subjects, an alphabetized Website Table of Contents, Pool Equipment Information, About Alan Biographic Material and a Pool Glossary. Use the Spa Problems Link, on top of every page, to access a complete listing of Spa Problem subjects, an alphabetized Website Table of Contents, Spa Equipment Information, About Alan Biographic Material and a Spa Glossary. Use the other links to access additional subject information.

 

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A $9.99 handling charge will apply to Continental U.S. Orders, under $75.00.  Orders outside of the Continental U.S. may require some additional charge, based on quantity and destination.
Most products can be shipped World-Wide.  
International and orders outside of Continental U.S. - see comments on the ordering pages.

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Testing Pool and Spa Water Chemistry!!!
Testing water is an integral part of pool and spa water management.  Reliable and accurate results are important, in order to maintain proper water chemistry. A ColorQ, all digital Water Tester can perform all of the common tests, while eliminating the color-matching and guesswork.  With 12 models, performing up to 11 different test factors, one is right for every need.  The WaterLink SpinTouch Labs are the ultimate tester, doing up to 10 different water test factors, in just 1 minute A PockeTester Kit is a convenient way to monitor the salt level, as well the overall water chemistry.
ColorQ All-Digital Water Testers WaterLink SpinTouch Labs Electronic PockeTesters
#2056 ColorQ PRO 7, all-digital pool and spa tester. WaterLink SPIN Touch Lab Professional Salt Water Test Kit.
Product and Ordering Information Product and Ordering Information Product and Ordering Information

If you have a pool or spa water testing need, we should have the product.
Scroll down to read through some calculating volumes information.
Some tests, such as Nitrates, Phosphates, Manganese, Copper, Iron and others, are not included, in some popular testers and require a Specialty Test Kit.  Using fresh Test Kit Replacements help assure better accuracy and reliability.  Insta-Test Strips can perform a wide variety of pool and spa tests.
Specialty Pool and Spa Test Kits Test Kit Replacement Supplies Insta-Test Pool and Spa Test Strips
Specialty Test Kits, for pools and spas. Replacement chemical and supplies for all LaMotte testing products. Insta-Test Strips for Pools and Spas
Product and Ordering Information Product and Ordering Information Product and Ordering Information

If you have a pool or spa water testing need, we should have the product.
Scroll down to read through some Calculating Volumes information.

 
How to determine pool or spa water volumes or measure the interior surface area?

How to determine pool or spa water volumes or measure the interior surface area? The volume of a pool, spa or hot tub 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 water volume. Interior pool or spa surface area is important to determine the cost of a resurfacing job or the amount of paint required for a refinishing.  If problems arise, refer to the Pool Problems Page or Spa Problems Page, as a source of problem-solving information, broken down into various categories.  Scroll down the page and click on the linked keywords or catch phrases below, to access additional information, on that topic or product.
 
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You'll receive 1-3 E-Letters a month, featuring helpful pool and spa advice, new product information and sale announcements.  All we require is your e-mail address and you can opt out anytime you wish.
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tape measure
 

Calculating Swimming Pool Volumes

         
 

Rectangular or Square Pools or Spas

 
 

 

Pool Calculations
Length (in feet) X Width (in feet) X Average Water Depth (in feet) X 7.5 = Pool Volume in Gallons
- or -
Length (Meters) X Width (Meters) X Average Water Depth (Meters) X 1000 = Pool Volume in Liters

Spa Calculations
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

 

         
 

Round (Circular) Swimming Pools or Spas

 
 

 

Pool Calculations
Diameter (in feet) X Diameter (in feet) X Average Water Depth (in feet) X 5.9 = Volume in Gallons
- or -
Diameter (Meters) X Diameter (Meters) X Average Water Depth (Meters) X 785 = Volume in Liters

Spa Calculations
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
 

         
 

Oval Swimming Pools or Spas

 
 

 

Pool Calculations
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 Liters

Spa Calculations
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 Pools or Spas

 
 

 

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 or spa.
Otherwise, use the calculations for either an oval or rectangular pools or spas and substitute an average diameter, width or length
.

         

Calculating Pool or Spa Interior Surface Area

 

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
.

 
  American/English Units: square feet
All measurements are in feet.
 
●   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

  Metric Units: square meters
All measurements are in meters.
 

●   Rectangular or Freeform Shapes: L X W X 1.6 = Square Meters of Interior Surface

●   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

         

Metric Conversions - Useful Conversion Factors

    LENGTH/DISTANCE    
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
    WEIGHT    
Kilograms X 2.205 = Pounds
Kilograms X 1000 = Grams
Grams X 0.0352 = Ounces
Ounces X 28.34 = Grams
Pounds X 0.454 = Kilograms
Pounds X 16 = Ounces
    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 32 = Fluid Ounces
         
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 C to F: double the C, subtract 10%, add 32 and now you have F. Example: 30C times 2 = 60, minus 10% (-6) = 54, add 32 and you get 86F.

From F to C: subtract 32, divide in half, add 10% and now you have C. Example: 90F minus 32 = 58, divide in half = 29, add 10% (2.9) and you get 31.9C.
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Free Shipping

Shipping is FREE* . . . within the Continental U.S.
A $9.99 handling charge will apply to Continental U.S. Orders, under $75.00.  Orders outside of the Continental U.S. may require some additional charge, based on quantity and destination.
Most products can be shipped World-Wide.  
International and orders outside of Continental U.S. - see comments on the ordering pages.

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