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understanding your warm tub"s volume can help you calculation the amount of money you"ll need to spend on power to store the tub warm for guests. In addition, the capacity likewise tells you the quantity of chemicals you should put in the bathtub to save it clean. The easiest means to figure your hot tub"s capacity is by fill rate, however you can also estimate the volume making use of the dimensions of the warm tub.

You are watching: How many gallons is my hot tub


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Step 1

usage the stop watch to time just how long it takes to to fill your warm tub. If much more than one minute, main point the variety of minutes through 60 and also then include the variety of seconds to transform to seconds. Because that example, if the takes 28 minutes 30 seconds, main point 28 by 60 to acquire 1,680 and also then add 30 to get 1,710 seconds. Leaving the water running.

Step 2

Time exactly how long the takes to to fill a gallon the water native the same source. This is the flow rate. If more than one minute, main point the variety of minutes by 60 and also then add the number of seconds to transform to seconds.

Step 3

Divide the moment it take away to to fill your hot tube in secs by the moment it take away to fill a gallon in seconds. Because that example, if that takes 1,710 2nd to fill your hot tub and 12 secs to fill a gallon, divide 1,710 through 12 to uncover your hot tub has a capacity of 142.5 gallons.


Dimensions Method

Step 1

Use the tape measure up to measure the dimensions of the hot bathtub in inches. If you have a round hot tub, measure up the diameter, or distance across the pool with the center, and also the depth. If you have a rectangular warm tub, measure up the length, width and also depth.

Step 2

Multiply size by width by depth for rectangular tubs or main point diameter through diameter by depth for round warm tubs. For example, if you have a round warm tube the measured 60 inches across and 48 inch deep, main point 60 through 60 through 48 to obtain 172,800.

Step 3

Divide the result by 1,728. In the example, division 172,800 by 1,728 to gain 100.

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Step 4

Multiply the an outcome by 2.4 if her hot tub has seating within or 4.8 if it has no seating inside to uncover the number of gallons in the hot tub. Completing the example, if the hot tub has no seating inside, multiply 4.8 by 100 to discover the hot tub capacity equals 480 gallons.


Mark Kennan is a writer based in the Kansas City area, specializing in an individual finance and business topics. He has been writing since 2009 and also has been released by "Quicken," "TurboTax," and also "The Motley Fool."