Hot Tub Sizes Gallons

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Have you just begun searching for your first hot tub? If that is true, then you might be concerned about whether or not your deck or patio can support the weight of a basic hot tub. Moreover, you may be new to the world of hot tubs and wondering how many gallons they can hold so that you can have a better idea regarding prospective water usage.

Many factors are involved in determining how many gallons of water are in a hot tub such as size, shape, and the number of people the hot tub can accommodate.

We\’re here to help you get a clear understanding of approximately how many gallons of water are required to fill hot tubs of different sizes and the steps you can take to calculate the exact amount if you need it.

Knowing the Amount of Water in your Hot Tub

There are several good reasons for calculating how many gallons of water it takes to fill a hot tub. Once you know its capacity, you can evaluate all kinds of useful information. You can learn the appropriate amount of cleaning products or purity chemicals to add, how much time it will take to heat, or the final weight of your hot tub.

Number of Gallons of Water in a Hot Tub Based on Size

The smallest hot tubs, on average, that can be found from manufacturers are 2-person hot tubs. Typically, a 2-person hot tub can hold anywhere between 150-220 gallons of water. A basic deck shouldn’t have any issue supporting the weight of a 2-person hot tub.

When two-person hot tubs are a little too snug for you, and you wish to take it up and enjoy extra space, the three-person hot tub is a way to go. You can expect a tub of this size to hold anywhere between 200-300 gallons of water. Just like the 2-person hot tubs, a 3-person hot tub works fine on a basic deck.

When your holidays are filled with entertaining family and friends, you may want to consider upgrading your 2 or 3-person hot tub. An average six-person hot tub holds anywhere between 320-475 gallons of water. A hot tub of this size can present challenges when placing on a deck depending on the count of people who are present in it simultaneously.

Calculating the Number of Gallons you Hot Tub can Hold

There are certain ways to calculate the number of gallons that can be held by an interior of a hot tub.

One of the easiest solutions for current hot tub owners is to check the user manual.

If you have misplaced the user manual somewhere, you can call the respective hot tub store to know the details of your hot tub by providing the model of your hot tub, or you can always run a Google search to see if you can find it online.

Manual Method

If you cannot find the information, you can always calculate the number of gallons the hot tub can hold manually.

For getting started, you will first need a tape measure.

  • If you’re dealing with a rectangular or square hot tub, you’ll require a tape measure to calculate its length, depth, and width. Once you know those measurements, you’ll need to multiply the depth by the width. Divide the answer by 1728 (this is the number which we use for converting the cubic inches number to cubic feet number).
  • On the other hand, round hot tubs are a little different. If you own a round hot tub, you need to measure its width across the central point and measure its depth. Once you get the diameter, you’ll multiply the depth by the diameter and then divide the result by 1728.
  • In case you have seats in your hot tubs, multiply the result by 2.4.
  • If the hot tub doesn’t have seats, you need to multiply the result by 4.8.
  • Once you’ve finished, you’ll have the answer for the number of gallons of water that will fill the interior of your hot tub.

Filling Method

Another method is the filling method. You can determine the capacity of a hot tub and the number of gallons it can hold by filling it with a water hose. Just ensure that you calculate the time it takes to fill.

  • Begin by turning on your water hose and placing it within your hot tub.
  • Keep a timer in hand to note down the time it takes to fill to its capacity.
  • Calculate the number of seconds your hot tub took to fill. 
  • Grab a single gallon jug and with the help of your water hose, fill it up with water and calculate the time it takes to fill. The number that comes when the jug becomes completely full is your flow rate per gallon.
  • Now divide the time your hot tub took to fill with water with the time recorded with the single gallon jug. The resultant number is an approximation of the number of gallons present in your hot tub.

Takeaway

  • There are many ways to manually measure the number of gallons present in a hot tub, however the easiest way is to search for your hot tub manual.
  • The hot tub gallons depend on its dimensions (length, width, depth), whether the hot tub features seats and if it does, how many seats it has.
  • Just like any bigger item holds greater number of water gallons, a 6-person spa holds far more water than a 2-person spa.

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