Hot Tub Foundation Suitability Calculator
Determine if your chosen surface can safely support your hot tub installation.
Hot Tub Length (ft)
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Measure the longest side of your hot tub.
Hot Tub Width (ft)
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Measure the shorter side of your hot tub.
Hot Tub Height (ft)
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Height is typically less critical but helps in volume calculations.
Hot Tub Empty Weight (lbs)
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Weight of the hot tub without water.
Water Capacity (gallons)
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Capacity in gallons (1 gallon ≈ 8.34 lbs).
Number of Users
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Estimated number of occupants (assumed 175 lbs per person).
Type of Base
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Select the surface where the hot tub will be placed.
-- Select Base Type --
Concrete
Gravel
Pavers
Wood Deck
Other
Soil Type
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Select the soil type under the gravel or pavers.
-- Select Soil Type --
Sandy
Clay
Rocky
Deck Rated Load Capacity (lbs/sq ft)
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Typical values range 30–50 lbs/sq ft.
Beam Spacing (inches)
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Distance between supporting beams.
Joist Thickness (inches)
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Thickness of the joists supporting the deck.
Calculate Foundation Suitability