Hot tubs bring the spa to you and can be used year-round, so it's no wonder they're so popular for backyard patios and decks. When considering installing a hot tub in your home or outdoor space, it's important to first consider the weight limitations for raised decks, ground-level patios, and interior floors. How much does a hot tub weigh? In this guide, we answer this question to help you make sure you have a strong enough foundation to support a hot tub on your deck, patio, or in your home.

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Why Does Hot Tub Weight Matter?
On Average, How Much Does a Hot Tub Weigh?
Factors That Influence the Overall Weight of a Hot Tub
How to Determine If a Surface Can Support a Hot Tub

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Why Does Hot Tub Weight Matter?

The weight of a hot tub can impact the structural integrity of your deck, interior floors, and patio surfaces, which can cause surfaces to warp, lean, or slope under the weight. Not only is this unsafe, but this damage also makes the interior of your hot tub more susceptible to spilling water (further damaging floors or wood decks). Strain from a hot tub's weight can also lead to cracked/uneven patio slabs or even collapsed decks if gone unchecked.

Knowing the weight is also important when moving a hot tub because you'll need to consider the type of equipment you need to move it safely and whether the new location can support the structure. More on determining the maximum weight of a hot tub for decks or patios in the last section below.

On Average, How Much Does a Hot Tub Weigh?

The average weight of a hot tub varies depending on whether or not it's filled with water. This is especially important to keep in mind when considering transporting a hot tub from one location to another. The weight of an empty hot tub is significantly less than one filled with water. Here are some examples of the average weight ranges for hot tubs when empty vs. full of water:

How Much Does an Empty Hot Tub Weigh?

Empty hot tubs can weigh anywhere from 500 lbs. to 1000 lbs. depending on their overall size and material construction (more on these factors in the next section).

How Heavy Is a Hot Tub Filled With Water?

When filled with water, hot tubs can weigh anywhere from 3,000 lbs. to 8,000 lbs. It's important to note that the weight of the people in the hot tub doesn't really matter due to water buoyancy, and most hot tub manufacturers factor the weight of the maximum number of occupants into the hot tub's total weight.

Tip!

When in doubt, always review a hot tub's product information online or in the manufacturer's manual for specific weight information for that model. On Wayfair, this information can be found under the "Weights & Dimensions" tab on the product's page. This includes the weight of the hot tub in pounds when empty and when filled with water.

Factors That Influence the Overall Weight of a Hot Tub

As we answer the question "how much does a hot tub weigh?", we also need to consider what factors influence a hot tub's weight. Understanding the factors behind the weight of a hot tub can help you tailor your search for the best hot tub.

1. Size/Person Capacity

As we touched on in the above section, a hot tub's overall size and the number of people it accommodates can have an impact on weight. Smaller hot tubs meant for two to three people and medium-sized hot tubs meant for four to five people usually have a weight of 500 lbs. empty and around 3000 lbs. when filled with water. Larger hot tubs meant to accommodate six to seven or eight or more people typically have an empty weight of anywhere between 600 lbs. to 900 lbs. and a filled weight of 4,000 lbs. or more.

Tip!

Review Hot Tub Sizes: How to Choose the Best Size for Your Home to determine which size accommodates the number of people in your household.

2. Material

The material of a hot tub can also influence its weight (whether when empty or filled with water). Plastic hot tubs reduce the overall weight of a hot tub whether empty or full, making it a great option if you want a lighter hot tub that can still accommodate a large number of people. Acrylic hot tubs are typically 100 lbs. heavier than standard plastic hot tubs, but they're more durable. Both of these materials resist pest and water damage, unlike natural wood or metal materials, which makes them ideal for hot tubs. Hot tubs made using wood or metal are usually the heaviest (even without water) due to their solid composition.

Tip!

Worried about how the weight of your hot tub could affect its movability? Try out an inflatable hot tub model! These are usually made of a durable vinyl plastic fabric that you can easily inflate or deflate. Overall, an inflatable hot tub makes it super easy for you to transport it from one location to another without much heavy lifting or special transportation needs required.

3. Tub Fullness (Water Level)

As mentioned in the previous section, the amount of water in the hot tub significantly impacts its overall weight. Empty hot tubs can be 400–500 lbs. lighter than full hot tubs. For example a two- to three-person hot tub that weighs around 500 lbs. empty could be 1000–2000 lbs. or heavier when filled with water. In contrast a five- to seven-person hot tub can be 1000 lbs. when empty and up to 8000 lbs. when filled with water.

How to Determine If a Surface Can Support a Hot Tub

Whether you already have a deck, patio, or hot tub room, or are considering building a new deck/patio space, you'll need to do some math to see if your space can support a hot tub. Here are some basic calculation examples you can use for hot tubs on decks, patios, or prospective hot tub rooms.

When You Know the Surface's Square-Footage:

The general rule of thumb is to multiply the total square footage of the deck or prospective space by 50 psf (pounds per square foot). Take a typical 300 sq. ft. deck as an example. When multiplied by 50, you get 15,000. This means the deck has the potential to hold up to 15,000 lbs. of weight at a time (remember this also includes any patio furniture, people, and other outdoor essentials like grills).

When You Know the Hot Tub's Total Weight:

You can also divide the total weight of the hot tub (when filled with water) by your deck's total square footage. If the total result is below 50 psf, then you're good to go! If the total is above 50 psf this means that the hot tub's weight is too high to be supported by the deck.

Patio Considerations:

With patios, your main concern will be whether the weight of a hot tub will crack or pitch the brick or concrete slabs, creating an uneven surface that then causes your hot tub to lean and spill water. In general, concrete or brick patios should be at least 4" deep/thick to support the weight of any hot tub. Consult a professional to determine if your patio needs further reinforcements to support a hot tub.

Important Note:

We highly recommend enlisting the help of a professional contractor to determine the structural-soundness/weight capacity of an existing surface, as well as to help construct a brand new structure to support your hot tub if you choose that route. Even if a surface meets the standard square-footage criteria, this doesn't mean it's strong enough to hold significant weight. This is especially important for older decks in need of some touch-ups!

Tip!

Now that we've answered the question, "how much does a hot tub weigh?", check out these relevant guides on purchasing and maintaining a hot tub:
Hot Tub Buying Guide
Quality Factors to Consider for Your Hot Tub
How to Clean a Hot Tub

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