askalanaquestion.com . . . the resource for help with pool & spa problems & information!
         
  Pool Problems Page Home Page Spa Problems Page  
  Pools & Equipment Information The Website Stores Spas & Equipment Information  
  The Pool & Spa Newsletter On-Line Shopping Stores The Pool & Spa Glossary  
  We Get Feedback Letters The Test Equipment Store Ask Alan Biographic Info  
  Links To Useful Websites New Pool & Spa Products Website Sponsorship Info  
  E-Mail Alan A Question Table of Contents - Index The Telephone Helpline  
 
 

"Pool & Spa Calculations"
The right calculations are needed to get the right results.
 

The Pool & Spa Informational Website
askalanaquestion.com

Calculating Water Volume
Calculating Interior Surface Area
Metric Conversions

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.

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    
The Website Stores
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

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
View Details

Click The Image For More Product & Ordering Information.

 
 

Swimming Pool
Volumes

Volume calculations are subject to reasonable error.
If possible, check with the builder or retailer.

 

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

 

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

 

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.

 

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.

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

 

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

 

Oval Spas:  Volume

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.

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

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.

 

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 0.352 = 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 16 = 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 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. 

 

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.)

   Return To Top Of Page  

Thank you for visiting AskAlanAQuestion.Com.  If you found the website helpful, please tell your friends and dealers.  If not, please tell us.  Your suggestions are appreciated.

 

Aqualab Systems., Inc. does not make any warranty or representation, either expressed or implied, regarding the accuracy or completeness of the information provided by this website; nor does Aqualab Systems., Inc. assume any liability of any kind whatsoever related to, or resulting from, any use or reliance on this information.  The content of this website should not be used, if it is conflict with any applicable federal, state or local regulations or guidelines.

©,  2002-10, A.S., Inc.  All rights reserved.
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 Hit Counter