How Much Does a Hot Tub Weigh? - Backyard Boss
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How Much Does a Hot Tub Weigh?

Hot tubs are great places to relax and unwind after a long day of work; plus they are great for home therapy options to provide hydrotherapy for pain relief and healing. They also come in a huge array of colors and sizes, and can be installed just about anywhere you have space for it.

Care must be taken, however, to avoid placing a hot tub where its weight may be more than what you bargained for. These are heavy products, that get even heavier with the addition of both water, and those looking for a relaxing soak. Before you commit to anything, be sure to ask yourself how much a hot tub weighs so you can ensure you place it is a supportive area.

Hot Tub Placement

Outdoor hot tub in the back yard with natural stone landscaping and green lawn.

Where you place your hot tub is important. It relays to your senses a sense of relaxation, privacy, and enjoyment- but you shouldn’t purchase a tub without first closely analyzing exactly where it is going to be installed. Whether in ground, outdoors, or indoors, these types of products require a strong foundation to hold the weight of the tub, water, and consequential soakers.

Various types of tubs exist to meet your needs. Tubs that are more permanent in nature require permanent installation, and often any weight concerns can be easily taken care of by the professional you hire. Just be sure to have them take a look at the area in advance of your purchase.

But if you are choosing a plug and play option, which allows you to place your tub just about anywhere within reach of a standard 120 volt outlet, or plan on taking over installation processes yourself, you’ll need to do a little research in advance.

How Heavy is a Hot Tub?

Outdoor hot tub, jacuzzi on the garden.

There is no true quick answer to this question simply because every tub is designed differently and has various water capacities. There is an average weight to water ratio you can go by, however, to help you keep in mind how strong your foundation needs to be. This is incredibly important for when you want to place your tub on a deck, gazebo, or raised patio.

Many 2 to 3 person empty hot tubs weigh in around 300 to 500 lbs without water. When filled with water, do not be surprised to find that it will weigh an average of 3000 lbs. If you are considering a 6 person to 8 person tub, these will often weigh close to 1000 lbs empty, and up to 6,000 lbs when filled!

Empty Weight vs Filled Weight Concerns

Closeup of hot tub

Many people quickly glance at weight when planning installation, may quickly calculate the amount of gallons the tub can hold, and come up with a rough estimate of overall weight. But what many people also forget is how much those using the tub adds to the overall weight. It doesn’t matter if that 4th person is hopping in a small tub during a social gathering, added weight to a focused area could cause problems if you have not planned in advance.

Adults aren’t adding 50 lbs either, they can easily weight 150, 200, even 250 lbs or more , so you should always take into account the overall full hot tub capacity and consider that you may end up with the extra 7th, 8th, or even 9th person hanging out on the side.

Installation Planning

If installing outdoors, consider a strong concrete slab as your foundation. If you are set on placing your tub on a raised area, hire a contractor to either reinforce your space, or consider placing the tub at ground level and building a deck around it.

Awesome water view with hot tub at dusk in summer evening. House exterior.

Keep in mind, dry weight, plus water weight (1 gallon of water = 8.345 lbs,  plus maximum capacity at 185 lbs average) will give you a rough idea of what your hot tub weighs.  You may want to add a person or two as well to the equation just in case.


A strong foundation is critical for the support and enjoyment of your hot tub. It doesn’t matter if you have a tub that measures 4×4 or 8×8, each will have a large amount of water on top of the dry weight that needs support. You also need to consider the weight of the people in the tub.

Keep in mind this simple equation tip when buying a tub: dry weight + water weight + occupant weight = foundational strength. If you can handle that much pre-planning, you are on the right track for placement!

Let us know below if you have any questions, and feel free to share!