Hot Tub Sizes: Dimensions and Filled Weight by Seat Count
Hot tub sizes from 2026 spec sheets: 2-seat tubs from 64 x 64 in and 1,655 lb filled, 8-seat up to 108 x 91 in and 7,840 lb, plus deck load and gate width.
Shortlist
Quick answer: Current 2-seat hot tubs measure about 64 x 64 to 81 x 65 inches and weigh 1,655-2,570 lb filled with people; 5-6 seat tubs are 78-84 inches square at 3,350-4,750 lb; 7-8 seat tubs run 91 x 91 to 108 x 91 inches at 5,810-7,840 lb. The number that decides a deck is not the footprint but the maker's own load figure, 90-130 lb per square foot in the Hot Spring, Caldera and Freeflow 2026 install documents, which is up to 66% higher than dividing filled weight by footprint. On delivery day the tub rolls on its side, so your narrowest gate has to clear the tub's height (29-38 inches), not its width.
Best for
Buyers choosing a seat count who need to know whether a tub fits the yard, the gate and the deck before they sign.
Wrong fit
Swim spa buyers; swim spas are a different weight class and need their own engineering review.
Tradeoff
More seats means more water to heat and more weight to carry: the 6-seat Hot Spring Flair holds 145 more gallons and weighs 2,150 lb more filled than the 2-seat TX, and needs a wider path, more overhead clearance and a stronger base.
A 6-seat hot tub is about 7 feet square and weighs about 4,700 pounds once it is full and occupied. That is the size most people mean when they say "hot tub," and it is the one most likely to surprise them twice: once at the side gate, and once when someone asks what the deck is rated for. This page lists the real dimensions, gallons, dry and filled weights and circuits of 17 current models from five brands, then shows the two numbers most size charts leave out: the load per square foot the manufacturer says your base must carry, and the clearance the tub needs while it is on its side on a delivery cart.
Quick Answer
Seat class
Exterior footprint (in)
Water (gal)
Filled weight with people (lb)
Models checked
2 seats
64 x 64 to 81 x 65
125-190
1,655-2,570
4
3-4 seats
79 x 67 to 84 x 68 (Beam: 80 x 80)
205-295
2,752-3,860
5
5-6 seats
78 x 78 to 84 x 84
240-350
3,347-4,745
5
7-8 seats
91 x 91 to 108 x 91
455-615
5,810-7,840
3
Ranges come from the model table below, read from manufacturer pages and documents on October 14, 2026. Heights run 29 to 38 inches. "Filled weight with people" counts 175 lb per seat, which is how Hot Spring, Caldera and Freeflow publish it. Where a brand publishes no comparable figure, we computed it and marked it.
Three rules carry most of the decision:
Seat count drives weight more than footprint does. The 6-seat Caldera Seychelles and Hot Spring Flair share an 84 x 84 inch footprint with the Jacuzzi J-335, and all three land within 25 lb of each other filled (the Jacuzzi figure is our calculation).
Your deck needs the maker's per-square-foot number, not your own division. Watkins Wellness publishes 90-130 lb per square foot for its 2026 models. The American Wood Council's prescriptive deck guide is built on 40 lb live load and 10 lb dead load per square foot and puts hot tubs outside its scope.
Measure the path for the tub on its side. A 91-inch-wide Hot Spring Grandee goes through a gate on edge: it needs 38 inches of width (or the cart's width, if wider) and 91 inches plus the cart height overhead.
How These Numbers Were Checked
Dimensions, gallons, dry weight and circuits come from each model's own product page on hotspring.com, calderaspas.com, jacuzzi.com and aquarestspas.com, read on October 14, 2026.
Load per square foot and delivery dimensions come from the current pre-delivery instructions: Hot Spring Highlife (PN 62982.26 A, 01/26), Limelight (62905.26 A), Hot Spot (62906.26 A) and Freeflow (62914.26 A); Caldera Utopia (62907.26 A), Paradise (63068.26 A) and Vacanza (62908.26 A); and Jacuzzi's 2026 Pre-Delivery Guide (GME1212 Rev. 26C, 6/2026).
Computed values are labeled "calc." Our formula: filled weight = dry weight + (gallons x 8.34 lb) + (175 lb x seats). Both Watkins and Jacuzzi charts work out to exactly 8.34 lb per gallon. Footprint average = filled weight / (length in inches x width in inches / 144).
Nothing here is measured by us. We did not weigh or measure tubs. Every figure is the manufacturer's own or arithmetic on it.
The Size Table: 17 Current Models
Exterior dimensions are length x width x height. "Filled" includes 175 lb per seat for every row so the rows compare.
Notes on the rows. Caldera's Aventine product page lists 500 lb dry and 2,100 lb filled; its 2026 Vacanza pre-delivery instructions list 440 and 2,060. We use the document because the load figure below comes from the same table. Jacuzzi publishes J-385 as "6-7 seating options"; we counted 7. Jacuzzi heights are the "maximum height" from its pre-delivery guide; its product pages list 36 inches for the J-335 and 37.5 for the J-385.
What the table says in plain terms:
Plug-in does not mean small any more. AquaRest's AR-600 seats six on a 120V/15A circuit, and Hot Spring's Beam and Jetsetter and Caldera's Aventine run on 115V. The tradeoff is heater output, not seats. Plug-and-play vs 220V hot tubs covers what you give up.
Rotomolded tubs are lighter dry, not lighter full. The Freeflow Monterey weighs 425 lb dry against 875 lb for the Hot Spring Flair, but water and people are most of a filled tub. Per seat, the gap shrinks to a few hundred pounds. Acrylic vs rotomolded covers the construction side.
Going from 6 seats to 7 or 8 is a bigger step than it looks on paper. The Grandee adds 16 inches of length and 1,090 lb over the Flair. The Cantabria adds 3,120 lb. At that size the base and the delivery path stop being details. Jacuzzi hot tub prices and Caldera vs Hot Spring carry the prices for these models.
"Filled Weight" Means Three Different Things
Before you compare two spec sheets, check what each one counts.
Hot Spring, Caldera and Freeflow include people. Every Watkins pre-delivery document says filled and dead weight "includes the weight of the occupants (assuming an average occupant weight of 175 lbs)."
Jacuzzi excludes people. Its 2026 Pre-Delivery Guide says the filled weight figures "do not include the weight of potential hot tub users." Its table uses the average fill volume: the J-335's 3,683 lb is exactly 764 lb dry plus 350 gallons at 8.34 lb.
AquaRest publishes dry weight and gallons only.
The gap is real money in a structural review. Jacuzzi's own sizing article gives the J-285 a "total filled weight of 5,166 lbs." Its pre-delivery guide gives the same tub 3,821 lb. The 1,345 lb difference works out to about 192 lb for each of the J-285's seven seats, which suggests the article counted people and the guide did not. Neither page says so.
Use this to normalize any tub:
Filled weight = dry weight + (gallons x 8.34) + (seats x 175)
If the adults in your house weigh more than 175 lb, use your real numbers. A structural engineer will.
Weight Per Square Foot: The Arithmetic and the Number That Counts
The obvious way to get a load is to divide filled weight by footprint. The manufacturers that publish a load figure do not get the same answer.
Model
Filled with people (lb)
Footprint (sq ft)
Footprint average (lb/sq ft)
Maker's published dead weight (lb/sq ft)
Published is higher by
Freeflow Mini
1,655
26.5
62
90
44%
Hot Spring TX
2,570
36.0
71
95
33%
Caldera Aventine
2,060
28.4
72
120
66%
Hot Spring Jetsetter
3,070
39.7
77
115
49%
Freeflow Azure
3,020
36.8
82
125
52%
Freeflow Aptos
3,450
42.3
82
90
10%
Freeflow Monterey
3,515
42.3
83
125
50%
Hot Spring Flair
4,720
49.0
96
120
25%
Caldera Seychelles
4,745
49.0
97
120
24%
Hot Spring Grandee
5,810
63.2
92
125
36%
Caldera Cantabria
7,840
68.3
115
130
13%
Jacuzzi J-335
4,733 calc.
49.0
97
not published
n/a
Jacuzzi J-385
5,911 calc.
57.5
103
not published
n/a
AquaRest AR-600
3,347 calc.
43.3
77
not published
n/a
Footprint average = filled weight / (length x width / 144). Published figures are from the 2026 Watkins pre-delivery instructions listed under Sources.
The Freeflow Aptos and Monterey show why the arithmetic is not enough. Same 78 x 78 inch footprint, 65 lb apart filled, and Watkins publishes 90 lb per square foot for one and 125 for the other. Watkins does not explain its method. The consistent gap suggests the figure is based on where the base actually bears on the pad rather than the cabinet outline, but that is our reading, not a manufacturer statement. Either way, the published number is the one the manufacturer tells you to design to: "This weight per square foot must not exceed the structure's rated capacity, or serious structural damage could result."
For context on decks: the American Wood Council's Prescriptive Residential Wood Deck Construction Guide (DCA 6, based on the 2015 IRC) sizes joists for 40 lb per square foot live load and 10 lb dead load, and states that "decks supporting large concentrated loads such as hot tubs are beyond the scope of this document." Every published figure in the table is above that 50 lb total. That does not tell you your deck fails. It tells you a standard prescriptive deck was not designed with a hot tub in mind, so the deck needs an actual check.
What to do with it:
Get the dead weight per square foot for your exact model from its pre-delivery or installation document. If the brand does not publish one, ask the dealer for it in writing.
For a deck, a balcony or anything indoors above grade, have a structural engineer or a licensed contractor compare that figure to the structure. Hot Spring, Caldera and Jacuzzi all say to consult one. Hot tub on a deck walks through that review.
For a ground install, the Hot Spring, Caldera, Freeflow and Jacuzzi documents all point to a reinforced concrete pad at least 4 inches thick, and Watkins requires it for the Grandee, Envoy and Cantabria. Hot tub pad compares the base options and what each costs.
Delivery Clearance: The Tub Travels on Its Side
The exterior dimensions in a brochure are the tub sitting on its pad. On delivery day most acrylic tubs ride a cart on edge, so the dimensions swap. Hot Spring and Caldera publish the on-edge dimensions for every model, and tell you how to use them: take the greater of the cart width or dimension W for the width you need, add the cart height to dimension H for overhead clearance, and use length L for any sharp turn.
Model
Width needed on edge, W (in)
Overhead before cart, H (in)
Length for turns, L (in)
Caldera Aventine
29
64
64
Freeflow Mini
29
53
72
Hot Spring TX
29
72
72
Caldera Kauai
29.5
65
84
Freeflow Azure
33
79
67
Hot Spring Jetsetter
33
68
84
Hot Spring Beam
33
80
80
Freeflow Monterey
34
78
78
Hot Spring Flair
36
84
84
Caldera Seychelles
36
84
84
Hot Spring Grandee
38
91
100
Caldera Cantabria
38
91
108
W is the tub's height and H is the tub's width. That is the whole trick: a 6-seat tub that is 84 inches wide needs a 36-inch path, not an 84-inch one, plus whatever the cart adds. The catch moves overhead. That same tub stands 84 inches tall on edge before the cart, so a low eave, a gutter, a branch or a sloped path can stop it where a narrow gate would not.
The same documents add three limits worth checking now, not on delivery day:
Stairs: no more than 6 consecutive steps without a landing.
Turns: "The spa will not bend." A 90-degree turn has to clear length L.
Cranes: Hot Spring, Caldera and Freeflow each state that "about ten percent of the time, a crane is the only way to install the spa," and that the crane is charged to you, possibly at the end of delivery.
Jacuzzi's 2026 guide does not publish on-edge dimensions. It says the spa "must remain on the delivery cart at all times," that cabinet panels are removed during delivery, and that crane cost "is not included in standard delivery service." Ask the Jacuzzi dealer for the on-cart width and height in writing. AquaRest publishes no delivery dimensions. Hot tub delivery and site prep has the full delivery-day checklist.
Space Around the Tub
The footprint is not the space you need. Two clearances get forgotten:
Cover lifter. Hot Spring's documents list 24 inches behind the tub for Cover Cradle and Cover Cradle II, 14 inches for Lift 'n Glide and 7 inches for UpRite. Caldera lists 24 inches behind for ProLift II and III, 14 inches for ProLift and 7 inches for ProLift IV, each with 3 inches per side. The cover lifter guide compares aftermarket lifters by clearance.
Equipment access. Every Watkins document tells you to leave access to the equipment compartment. A tub pushed against a wall on its service side turns a routine repair into moving a 5,000-lb object.
Steps add depth on the entry side too; steps and handrails covers tread and height fit.
How to Pick the Right Size
Count regular users, not party guests. Buy for the people in the tub on a Tuesday. Going from the 2-seat Hot Spring TX to the 6-seat Flair adds 145 gallons to heat and 2,150 lb to carry.
Choose the power lane first. If you are not adding a 230-240V circuit, your list is the 115-120V models. That now includes 4- to 6-seat tubs, with a smaller heater.
Measure the narrowest point of the path. Compare it with W plus the cart, and the lowest overhead point with H plus the cart. Check every turn against L.
Get the maker's load per square foot. Use it, not the footprint average, for a deck or pad conversation.
Add the clearances. Lifter space behind, service access on the equipment side, steps in front.
Put delivery terms in the quote. Who pays if a crane is needed, and what happens if the crew cannot place the tub. Our quote checklist lists the lines, and the free quote review checks a real quote against them.
What We Could Not Verify
How Watkins computes dead weight per square foot. The documents publish the figure but not the bearing area behind it. Our explanation for why it exceeds footprint arithmetic is an inference.
Load figures for Jacuzzi and AquaRest. Neither publishes a per-square-foot figure. Their rows in the load table are our arithmetic and should not be used for a structural decision.
Which Caldera Aventine weight is current. The product page (500 lb dry, 2,100 lb filled) and the 2026 pre-delivery document (440 lb, 2,060 lb) disagree.
Jacuzzi's capacity numbers. The J-335 product page lists 350 gallons as "Volume" and 450 as "Capacity Average"; the pre-delivery guide lists 350 as the average fill. The guide also defines filled weight as water "filled to the point of overflowing," but its figures match the average fill. We used 350.
Delivery cart dimensions. No manufacturer publishes the cart's height or width; they vary by dealer.
Your deck or slab. Nothing on this page can tell you whether a specific structure holds a specific tub.
The most common size is about 7 feet square: 84 x 84 inches and 36 inches tall, seating 6. The Hot Spring Flair, Caldera Seychelles and Jacuzzi J-335 all use that footprint. Two-seat tubs start around 64 x 64 inches, and 7- to 8-seat tubs run 91 x 91 to 108 x 91 inches.
How much does a hot tub weigh?
Empty, 232 to 1,310 lb across the 17 models above. Filled with water and people at 175 lb each, about 1,650 lb for a small 2-seat tub, about 4,700 lb for a 6-seat tub and up to 7,840 lb for the 8-seat Caldera Cantabria. Check whether a spec sheet includes people before comparing: Watkins brands do, Jacuzzi does not.
What size hot tub do I need for 4 people?
A 3- to 4-seat tub is roughly 79 x 67 to 80 x 80 inches and weighs about 2,750-3,860 lb filled with people. If four adults will use it together often, compare 5- to 6-seat models too. Seat labels differ by brand, so sit in it during a wet test.
Will a hot tub fit through a 36-inch gate?
Many will, because tubs travel on edge. In our delivery table, every 2- to 6-seat model's on-edge width W is 36 inches or less, and the 7- and 8-seat models need 38. Add the cart's width if it is wider than W, and check overhead clearance, which is the tub's full width plus the cart height.
Can my deck hold a hot tub?
That needs a structural engineer or licensed contractor, not a chart. The figure to give them is the manufacturer's dead weight per square foot: 90-130 lb in the 2026 Watkins documents. The American Wood Council's prescriptive deck guide is built for 40 lb live plus 10 lb dead per square foot and excludes hot tubs from its scope.
How deep is a hot tub?
Exterior heights in our table run 29 to 38 inches. Smaller and plug-in tubs sit at 29-33 inches; 6- to 8-seat dealer tubs at 36-38. Water depth is a few inches less than the exterior height, and seat depth varies by seat.
These guides are built from manufacturer documentation, public specifications, primary research where health claims matter, and repeated buyer questions that show up in real ownership and installation decisions.
Manufacturer and dealer sources can clarify pricing bands, warranty terms, support footprint, or common mistakes. They do not move a page up the shortlist on their own.
Written by Hot Tubs Guide Editorial TeamReviewed by Hot Tubs Guide Editorial Team, Independent hot tub buyer research on October 14, 2026How we reviewEditorial policy
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