Tub Gals

Tub Gals
Wait! Have you read my all-time most popular post?
The Best Hot Tub Cover Lifters by Type and Price
If you’ve ever filled up a hot tub or been concerned about water usage, you may have asked how many gallons are in a hot tub.
Here’s what I’ve learned from owning 4 different ones:
As a general rule, a small 2-3 person hot tub will hold approximately 300 gallons, a 4-5 person hot tub will have 275-375 gallons, whereas a large 6-8 person hot tub will hold up to 675 gallons or more.
Hot tubs range in both size, shape, and depth. All of those factors affect how many gallons they hold.
But there are so many different sizes, shapes, and styles of hot tubs. So below we’ll into a few different ways to accurately calculate yours. So let’s keep going!
There are plenty of good reasons to calculate how many gallons of water are in your hot tub.
Once you get an idea of how much it holds, you can figure out all sorts of useful information. You can learn how much money it should take to heat, the correct amount of purity chemicals or cleaning products to add, or the final weight of your hot tub.
We’ll go over two tried and true calculation methods in this article. First is the timed filling method , a slower but simpler way. And second is the dimension calculation method , an instant but slightly more complex way.
Let’s face it. Balancing the water, cleaning filters, dealing with rashes, and trying to figure out which chemicals to buy and add can make you feel more like a chemist than someone who just wants to relax after a long hard day!
That’s exactly why The Hot Tub Handbook and Video Course is so valuable!
This is from Matt over at Swim University and he developed it for people looking to save money, time, and frustration. His tips on chemicals can save you $100/year just by making sure you buy only what you need.
So if you’re ready to stop being confused or frustrated with your hot tub and start spending more time in it, check out The Hot Tub Handbook and Video Course .
Just click that link to learn more on their website.
Calculate the gallon capacity of a hot tub by multiplying the width, length, and depth of the hot tub in inches. Divide the result by 1,728. If the hot tub has seats, multiply the result by 2.4. If not, divide by 4.8.
But there are different calculations for non-standard-shaped hot tubs. As mentioned above, there are two methods for determining a hot tub’s approximate capacity.
There’s the timed fill method and the dimension calculation method . They both involve a bit of math but the timed fill method seems to be the most simple. So, let’s start there.
We’ll use the following steps to easily figure out your tub’s capacity:
If you want to know about how long your hot tub will take to fill up, check out my filling guide here for a rough estimate of how long you’ll be waiting.
Just click that link to read it on my site.
It took 1 hour and 30 minutes to fill the hot tub. 1 hour x 60 = (60 minutes + remaining 30 minutes) x 60 = 5,400 seconds.
Get your 1-gallon jug and timer ready. Make sure your hose is set at the same pressure as it was to fill your hot tub. If there’s a variance here, it will mess up the final calculation.
For the severely math impaired, (i.e. me) the timed fill method is the way to go. It will take a bit more time, but filling your hot tub is part of the required maintenance anyway. It’s a good opportunity to take advantage of this easier solution.
If you need an answer NOW and don’t mind a bit more complex math read on to learn the dimension calculation method .
We’ll use the following steps to calculate the size of your hot tub:
This method varies slightly depending on if you have a square or round hot tub. Let’s start with a square tub.
This method also works for a rectangular hot tub. Next, let’s check out the round tub method.
Math is hard! How much water is in a hot tub roughly?
You’ll find a few rough estimates below. But you absolutely should measure yours accurately to get the approximate amount of gallons.
For more on measuring hot tub weight, along with estimated weights empty, filled with water, and occupied with people check out my full guide here .
It’s full of quick answers in case you need to move a hot tub, or if you’re placing one on a wooden deck and aren’t sure if it can take the weight. After all, the average weight of a hot tub full of water and people, even a small tub or rectangular tub, will still be well into the thousands of pounds.
Just click that link to read it on my site.
Small hot tubs like a 4-person hot tub contain about 150-220 gallons of water.
Small hot tubs like a 4-person hot tub contain about 200-300 gallons of water.
Small hot tubs like a 4-person hot tub contain about 275-350 gallons of water.
Small hot tubs like a 5-person hot tub contain about 300-375 gallons of water.
A 6 person hot tub is similar in size to a 5 person tub. So the amount of water is about 325-475 gallons in a 6 person hot tub.
Medium-Large hot tubs like a 7×7 hot tub typically hold about 370 gallons of water.
Large hot tubs like an 8 x 8 hot tub can hold anywhere from 550 to 625 gallons of water. This is the most typical hot tub.
An 8 person hot tub can hold about 615-675 gallons of water. These behemoths can weigh as much as 7800 pounds when filled! So think twice before installing one of these bad boys on your deck.
I have a full article about safely putting a hot tub on a deck.
I get into how to easily calculate whether your deck can hold one, but also how to retrofit your deck to take the extra weight.
Just click that link to read it on my site.
Water does indeed evaporate from hot tubs.
This is one important reason to know precisely how many gallons your hot tub holds. You’ll have to add water accordingly from time to time. When you do, make sure to check the chemical levels to prevent bacteria growth.
Keep in mind that there are a lot of factors that determine how quickly water will evaporate from your tub. Some of those include:
Want to learn more? Check out a full write-up here about water loss in hot tubs on one of my other websites.
Yes, there is one available. It still requires some of the measurements I talked about above. But it does make it quick and easy to calculate and takes some of the math headaches out for you.
Just go to AquaChek to see their calculator and use it now. Totally free.
Using the above estimates might be okay temporarily.
But we do hope you’ll consider measuring your hot tub’s capacity accurately. As you can see, it’s not very difficult or time-consuming. Doing it the right way will set you up to enjoy your hot tub exactly as it was meant to.
You’ll also get plenty of valuable insights like your hot tub’s weight, electricity costs, and proper chemical amounts when cleaning time comes around.
Try the timed-filled method next time you change your water for the most painless way to go. Or grab a calculator and use the dimension measuring method if you need an answer now.
Photo credits that require attribution:
Jeff Campbell is a father, martial artist, budget-master, Disney-addict, musician, hot tub lover, and recovering foodie having spent over 2 decades as a leader for Whole Foods Market.
It's not uncommon to buy a used hot tub and move it to your house. But when you do that and have to move it, it's natural to wonder how much does a hot tub weigh?

Here's what I learned in doing...
I've owned 4 hot tubs, but until our current one, they've always been on a stone or concrete pad. Since our current one isn't, I've wondered how to determine if a deck can support a hot...
Hi! I'm Jeff Campbell. I have owned 4 hot tubs going back to 2005, and learned a lot through trial and error. When I'm not spending time with my 3 daughters, I can usually be found practicing martial arts, making music, blogging on my other blogs, or of course, sitting in our hot tub!
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