Short answer: pick the size by how many people will use the sauna at the same time, then check that its outside dimensions, height and power needs fit your room. Most home infrared saunas are prefab cabins: a 1 to 2 person model takes a footprint of roughly 3 by 3 feet, a 2-person model about 4 by 3.5 feet, and a 4-person model about 6 by 4 feet, all around 6 feet 1 inch to 6 feet 5 inches tall. If you like extra elbow room, size up one step.
Below you'll find real dimensions from saunas we sell, how infrared and traditional saunas differ in sizing, and a measuring checklist. We checked the product sizes in October 2026.
Step 1: Count the people
A sauna's person rating assumes people sitting upright, shoulder to shoulder. Use it as a ceiling, not a comfort target.
- Just you: a 1-person sauna is the most compact choice. Many compact models are rated 1 to 2 people, which gives one person room to spread out.
- You and a partner: a 2-person sauna fits two adults side by side. If you both want space, look at a 3-person model.
- Small family or friends: a 3-person sauna or 4-person sauna fits a group without knees touching.
- Want to lie down? Prefab infrared cabins are built for sitting. To stretch out you need a long bench, which usually means a large cabin, a barrel or a traditional sauna with a full-length upper bench.
Step 2: Real infrared sauna sizes by capacity
These are the outside dimensions (width x depth x height, in inches) of infrared saunas we carry. Inside space is a few inches smaller on each side.
| Capacity | Example model | Outside size (W x D x H) | Power |
|---|---|---|---|
| 1 to 2 person | Dynamic Barcelona | 39 x 38 x 73 (inside 36 x 34 x 70) | 120V, 15A dedicated |
| 2 person | Dynamic Santiago | 46 x 40 x 75 (inside 42 x 36 x 72) | 120V, 15A dedicated |
| 2 person | Dynamic Venice | 50 x 46 x 77 | 120V, 15A dedicated |
| 3 person | Dynamic Lugano | about 60 x 49 x 75 | 120V, 20A dedicated |
| 4 person | Dynamic Bergamo | 70 x 46 x 75 | 120V, 20A dedicated |
| 4 person | Maxxus 4-person | 74 x 48 x 75 | 120V, 20A dedicated |
Two things stand out. Height barely changes with capacity, since every cabin here is between 73 and 77 inches tall, so a standard 8-foot ceiling leaves plenty of room. And moving from 2 to 4 people mostly adds width, so a long, narrow wall often suits a bigger sauna better than a square corner does.
Step 3: Measure your space
- Footprint: measure length and width, then leave a few inches behind and beside the cabin for the power cord, air flow and assembly. Check the manual for your model's exact clearances.
- Height: measure floor to ceiling, and remember you assemble the cabin in the room. Leave some headroom above the cabin, since the roof panel goes on last.
- Door swing and path: leave room for the sauna door to open fully, and check that the boxed wall panels fit through your doorways and down any stairs.
- Floor: it must be level and solid. Most infrared cabins have their own floor, but check the manual for which surfaces it allows. See our indoor saunas for models made for basements, garages and spare rooms.
- Outside: an outdoor sauna needs a level, solid base such as a concrete pad or deck that can carry its weight, plus weather protection. Browse outdoor saunas for barrels and cabins built for the yard.
Step 4: Check the power before you choose the size
Size and power go together. The infrared saunas in the table above all run on 120 volts, but the circuit grows with the cabin: 1 to 2 person models call for a dedicated 15-amp circuit and 3 to 4 person models a dedicated 20-amp circuit. The Dynamic manuals say not to use an extension cord, adapter or surge protector, and not to plug into a GFCI outlet.
Traditional saunas with a stone heater usually need a dedicated 240-volt circuit sized for the heater. Local electrical codes sometimes require GFCI protection in damp locations, so have a licensed electrician check your model's manual against your local code before you buy.
Infrared vs traditional: how sizing differs
Infrared saunas warm your body with heater panels set in the walls, so they don't depend on heating a big volume of air. That's why they come as compact, fixed-size cabins, and why you choose them mainly by seat count and footprint.
Traditional saunas heat the air with a stove and stones, so room volume matters much more. If you're planning one, these rules of thumb help:
- Ceiling: many traditional saunas are built around 7 feet (84 inches) tall. Going much lower than about 6 feet 5 inches (77 inches) leaves too little room above the upper bench, and going much higher than 8 feet means heating air above your head.
- Bench length: plan about 2 feet of upper bench per person sitting. To lie down, you need a bench at least as long as you are tall.
- Heater size: a rough starting point is about 1 kW of heater per 50 cubic feet of room (length x width x height). Glass doors, windows and uninsulated walls lose heat, so add capacity for them. Then check the heater's own minimum and maximum room volume; for example, a typical 6 kW heater is rated for roughly 140 to 280 cubic feet.
- Ventilation: a common layout puts the fresh-air intake low on the wall under or near the heater and the exhaust on the opposite side, about 2 feet above the floor. Follow the heater maker's ventilation and clearance instructions.
Your sauna size checklist
- How many people will use it at once, and does anyone want to lie down?
- Room length, width and floor-to-ceiling height, with headroom for assembly.
- Clearance behind and beside the sauna, and space for the door to swing open.
- Doorways and stairs wide enough for the boxed panels.
- A level, solid floor or outdoor base.
- Power: a dedicated 120V 15A or 20A circuit for most infrared cabins, or 240V for a traditional heater. Ask an electrician to confirm.
- Infrared or traditional, since that decides whether room volume and heater size matter.
Quick picks by household
- Solo user, small space: a 1 to 2 person cabin around 39 x 38 inches fits a closet-sized corner.
- Couple: a 2-person cabin around 46 x 40 inches, or a 3-person model if you want room to shift around.
- Family of four: a 4-person cabin around 70 to 74 inches wide and about 4 feet deep, on a 20A circuit.
- Want to stretch out or host a group: look at larger traditional or outdoor saunas with long benches.
Once you know the size, compare heater type, wood and features within that size group. If a model's measurements are close to your space, measure twice and check its manual before you order.
