How Much Does a Hot Tub Weigh? A Detailed Guide

The addition of a hot tub can transform your home into a spa-like retreat. But before you dive into relaxing waters, it’s essential to address a practical concern many overlook: how much does a hot tub weigh? Whether you’re thinking of installing a new one, moving an existing one, or ensuring the structural integrity of your deck, understanding the weight of your hot tub is paramount.

Breaking Down the Weight

  1. Empty Hot Tub Weight:
  2. Before it’s filled, an empty hot tub can vary greatly in weight depending on its size and the materials used for construction. A small hot tub designed for 2-3 people might weigh as little as 500 pounds when empty, while a large hot tub built to accommodate 6 or more could weigh upwards of 1,000 pounds without water.
  3. Water Weight:
  4. Water is heavy. One gallon of water weighs approximately 8.34 pounds. So, when pondering how heavy is a hot tub when filled, consider the capacity. For instance, a hot tub that holds 300 gallons of water will add roughly 2,500 pounds to the total weight just from water.
  5. Number of People:
  6. Don’t forget to factor in the weight of the occupants. An average adult might add an additional 150-200 pounds.

Combining these weights gives a clear picture of what your tub will weigh when in use. A full of water medium-sized hot tub, for instance, might come in around 3,500 to 5,000 pounds, once you account for both the water weight and several adults.

Where You’re Putting It Matters

If you’re considering a deck installation or a location with a raised foundation, understanding how much a hot tub weighs is critical. Not all decks or raised spaces can support the weight of your hot, especially when full.

  1. Concrete Slab: For maximum stability and to ensure safety, many opt to install a hot tub on a concrete slab. This kind of foundation is robust and is the best choice, especially for larger tubs that can get very heavy when full.
  2. Structural Integrity: Before installing or moving a hot tub, especially on raised platforms or decks, you need to ensure that the structure can handle the total weight. It’s always a good idea to consult with a structural engineer.

Average Hot Tub Weights and Sizes

  • Small Hot Tub (2-3 persons): Weighing between 2,500 to 3,500 pounds when full. Holds approximately 200-300 gallons.
  • Medium Hot Tub (4-5 persons): Tipping the scales at 4,000 to 5,500 pounds when full. Holds around 350-450 gallons.
  • Large Hot Tub (6+ persons): Can weigh a staggering 6,000 to 8,000 pounds or more when filled, with a capacity exceeding 500 gallons.

Remember, these are average hot tub weights, and exact numbers can vary based on the shapes and sizes of specific models and the materials used.

Moving a Hot Tub

If you ever need to relocate your spa, remember the weight considerations. While an empty hot tub is heavy, it’s manageable with the right equipment and a team. However, a hot tub full of water is a massive undertaking and generally requires professionals to move.


Whether you’re in the market to buy a new spa or relocating an existing one, understanding how much a hot tub weighs is crucial for safe and effective placement. It’s more than just a number; it’s about ensuring a secure and long-lasting spa experience.

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