Frequently asked questions

A sauna does not treat a cold or shorten one, and a fever already puts the body under strain. If you are ill, postpone the visit and ask a health professional about your own situation.

Sauna bathing is heat exposure, not treatment: it does not remove an infection or speed up recovery, even if warmth feels good for a moment. When you are ill, temperature regulation and fluid balance are already under strain, so sweating and rapid changes between hot and cool can feel harder than usual. We do not assess individual symptoms, temperatures or conditions — that belongs to a doctor or a health advice line, not to a directory. In a public sauna, remember the other visitors too: a shared room is the wrong place to be while contagious. The general principles of managing heat and leaving early are collected in our guide to using a sauna responsibly.

The sauna has no single inventor: bathing with hot stones and water was known widely across the north in prehistoric times. What is Finnish is what the sauna became here — an everyday, unbroken practice that UNESCO added to its intangible heritage list in 2020.

The question assumes an inventor who does not exist. Bathing forms built on heated stones and water were in use across a wide area of northern Eurasia long before written sources, so no single origin point and no single person can be identified. What stands out in Finland is not invention but continuity: the sauna never narrowed into a rare ceremony, it stayed part of an ordinary week, which is why UNESCO added Finnish sauna culture to the Representative List of the Intangible Cultural Heritage of Humanity in 2020. The word “sauna” itself is Finno-Ugric and travelled from there into many other languages, which is part of why people look for the inventor in Finland. What the concept is actually built on is explained in our guide to what löyly really means.

There is no exact figure, because saunas are not entered in any register. The most commonly quoted estimate is around three million saunas in a country of roughly 5.6 million people — an estimate, not a count.

No authority keeps a record of saunas, so every figure is an estimate, and sources differ depending on what they include. The order of magnitude is not in doubt: there are millions, and the great majority are private — saunas in flats, houses, summer cabins and housing companies that no outsider can enter. A national figure therefore describes the sauna's place in everyday life, not how many you could go and try. This directory does not try to count them all: it covers 514 saunas, and 37 municipalities have a page of their own. The ones open to visitors are in the sauna directory.

Shower before you go in, sit on a towel or a mat, ask before throwing more water on the stones, and keep your voice low. A sauna is not an endurance contest: step out whenever you want to.

Finnish sauna customs are practical rather than ceremonial. Showering before entering matters most, because the benches are shared, and sitting on a towel or a small mat follows the same idea. Löyly — the steam from water thrown on the stones — is a shared thing, so people usually ask the room before adding more; that is courtesy rather than a rule. Nudity is normal and entirely unremarkable in single-sex sessions, but many venues run swimwear sessions or separate rooms, so it is worth checking the practice at the place you are visiting. Phones stay in the changing room. What löyly and the heater are actually doing is explained in our guide to how a Finnish sauna works.

There is no universal age limit, and it is not something to settle from a web page: an infant regulates heat differently from an adult. Confirm the right time with your child health clinic or a paediatrician.

We do not give an age, a temperature or a duration for a baby — those are clinical judgements, and this site is a sauna directory. In general terms, an infant's temperature regulation and sweating do not work as an adult's do, so heat affects them differently and an adult carries responsibility for watching the situation throughout. In Finland the sauna is an everyday family space and children often join early, but a custom is not guidance that fits every child or every venue. Ask your child health clinic or a paediatrician what suits your own baby. The rule about leaving is the same for everyone and is covered in our guide to using a sauna responsibly: if anything changes, you go out immediately.

The weight you appear to lose in a sauna is fluid lost through sweating, not fat, and it returns as soon as you drink. A sauna is not a weight-loss method.

This is the most persistent sauna myth, and dismantling it serves the reader better than any calorie figure: the weight lost in a sauna is water. The fluid returns after a couple of glasses, so the number on the scales before and after says nothing about fat. Heat raises the heart rate and thermoregulation uses energy, but we do not publish a calorie figure: the estimates in circulation differ so widely between sources that none of them helps anyone. Deliberately losing fluid to move the scales is not a safe goal either. The value of a sauna is in the warmth, the pause and the custom; how that heat is produced in the first place is explained in our guide to how a Finnish sauna works.

There is no single national distance: setbacks follow the local plan for the plot, the municipality's own building code and fire-safety requirements. The binding answer comes from your municipality's building control office.

We do not quote metres, because no general figure exists. The distance to the shoreline, to a neighbour's boundary and to other buildings follows the local plan, the municipality's own building code and the fire-safety separation between buildings — and these differ even between neighbouring municipalities. They also change over time, so a “usually about X metres” picked up online is the most common way to start a project wrongly. The right address is your municipality's building control office, rakennusvalvonta: it holds the real conditions for the plot and can say whether a permit is needed at all. This site is a directory for visiting saunas, not a building guide — finished venues are in the sauna directory.

For an electric sauna it is the heater's power in kilowatts times the heating time times your own price per kilowatt-hour, so there is no single figure. The heater's rating is on its data plate.

The calculation is simple enough to do yourself: power (kW) × heating time (h) = kilowatt-hours, and kilowatt-hours × your contract price = euros. We do not publish a ready-made figure, because heater power, the size and insulation of the room, the heating time and the price of electricity vary so much that an average would be wrong for almost everyone. With a wood-burning heater the cost is firewood rather than electricity, and it depends on whether the wood is bought or cut. In a public sauna this is not the visitor's question at all: you pay an entry fee, not the heating. What the heater and the stones do with that energy is explained in our guide to how a Finnish sauna works.

There is no general ban on sauna bathing after a vaccination, but if you feel feverish, tired or otherwise unwell afterwards, postpone the visit. Vaccine-specific advice comes from whoever gave the vaccination.

We do not give waiting times or vaccine-specific rules: the advice can differ between vaccines, and it belongs to the nurse or doctor who administered it. The general principle is the same as always — a sauna is heat exposure, not treatment, and heat does not improve a body that already feels off. Soreness at the injection site is a common after-effect, but how you feel otherwise is what decides the timing. If you are left unsure, ask wherever you had the vaccination; that is faster and more reliable than a web search. The basics of managing heat and leaving early are in our guide to using a sauna responsibly.

A phone does not belong in the hot room: heat and moisture damage the device, and in a shared sauna a camera is a privacy question. Many public saunas expect phones to stay in the changing room.

There are two reasons, and either one is enough on its own. For the device, a hot room is the wrong place: manufacturers' stated operating temperatures sit well below sauna temperatures, and moving between hot and cool draws moisture inside. The second reason weighs more: in a shared sauna people are undressed, and the presence of a camera changes what the room is. Many Finnish public saunas therefore keep phones out of the hot room and often the changing rooms too, and the rule covers having the device out at all, not only taking pictures. Practices vary by venue, so always check that sauna's own instructions; the same advice appears in our guide to using a sauna responsibly.