calculating pool water volume: swimming pool water chemistry

► Calculating Water Volume
► Calculating Interior Surface Area
► Metric Conversions

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.

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

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.

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