Japanese bathing culture is built around one idea: the bath water is shared, so everyone keeps it clean. The rules are not complicated, but getting the order wrong will quickly draw attention. This guide walks first-time visitors through the bathing steps, how to handle towels and tattoos, and the differences and price ranges between onsen, sento and super sento, with facts checked against official Japanese sources.

Onsen vs. Sento vs. Super Sento

They look similar, but these three are classified differently under Japanese law and priced differently too. An 'onsen' is defined by the Hot Springs Act as a facility using naturally occurring water of 25°C or hotter, or water containing certain minerals (overseen by the Ministry of the Environment). Think of the indoor baths at a ryokan or a remote mountain inn.

A 'sento' is a public bathhouse under the Public Bath Houses Act, run for local residents' hygiene and overseen by the Ministry of Health, Labour and Welfare. Prices are capped by each prefecture, so the goal is affordable cleaning rather than luxury. The water is not necessarily from a hot spring and is often simply heated tap water.

A 'super sento' is a large bathing complex with restaurants, saunas and relaxation areas, classified as an 'other public bath' with no price cap. Some pipe in real hot-spring water; others use artificial or heated water, so the name alone tells you nothing about the source.

  • Onsen: natural spring water defined by law; ryokan baths and inns. Prices vary widely by stay or day-use.
  • Sento: neighborhood bathhouse under the Public Bath Houses Act; price capped by the prefecture.
  • Super sento: large facility with extras; freely priced, from a few hundred to several thousand yen.

Prices and What to Bring (as of 2026)

Sento admission is capped by each prefecture. In Tokyo, from the 1 August 2024 revision, adults (12+) pay ¥550, children 6–11 pay ¥200, and infants under 6 pay ¥100. Kanagawa also raised its adult rate to ¥550 from 1 March 2025, so roughly ¥550 is the going rate in the greater Tokyo area. Hokkaido sets the adult rate at ¥500, so figures differ by a few dozen yen. Because these are official capped rates, almost every sento in the same prefecture charges the same.

Super sento have no price cap, ranging from around ¥1,000 for a weekday adult up to about ¥2,900 at the priciest Tokyo facilities. Day-use bathing at onsen ryokan also varies, from a few hundred yen to around ¥2,000. Prices change, so it is safest to check each facility's official website before you go.

Many sento do not include soap, shampoo or towels, or charge for them. You can buy a small towel and amenities at the front desk, but bringing your own is cheaper. Super sento and onsen ryokan often include towels and amenities in the price, so the situation is different.

  • Cash: older sento are often cash-only, so carry coins.
  • Towels: a small towel for washing and a bath towel to dry off; bring your own at a sento.
  • Coins / IC card: for lockers and vending machines.
  • Hair tie: to keep long hair out of the water.

The Bathing Steps (undress, rinse, wash, soak, cool down)

Baths are separated by gender. Tell the entrances apart by the color and characters on the noren curtain: red and the character for 'woman' for the women's bath, blue and 'man' for the men's. First, undress completely in the changing room and put everything in a locker or basket. You cannot wear a swimsuit or underwear into the bath, and there are no exceptions in gender-separated baths.

Inside the bathing room, do not head straight for the tub. First do 'kakeyu': scoop water with a bowl and pour it over yourself, starting from the feet and moving up, to adjust to the temperature and rinse off. Then use a shower or tap at the washing area to wash your whole body with soap and shampoo, rinsing away all lather. Washing before you enter is the single most important rule, because the water is shared.

Once clean, enter the tub quietly. Do not soak too long; if you feel dizzy, get out and rest. When you leave, wipe off the water on your body before returning to the changing room so you do not soak the floor. Rehydrate afterward and rest until you stop sweating before dressing, which helps you avoid getting chilled.

Towel and Washing-Area Rules

The small towel is for covering yourself while moving around and for washing at the wash station. But never put the towel into the bath water. This keeps the shared water clean, and the Japan National Tourism Organization (JNTO) states it clearly. When you enter the tub, fold the towel on your head or set it on the rim.

Always wash your body and hair at the washing area, never inside the tub or right beside it. Others use the taps too, so when you finish, rinse away your lather and hair and return the bowl and stool to where they were.

If your hair is long, tie it up so it does not touch the water, even after washing. Even freshly washed hair in the water is considered inconsiderate to others. Taking photos in the bathing area is a serious invasion of privacy and will get you asked to leave immediately, so never do it.

Tattoos: The Reality and Your Options (as of 2026)

In Japan, tattoos have historically been associated with organized crime, so many facilities have voluntarily refused entry to avoid intimidating other bathers. Japan is said to have about 27,000 hot-spring facilities, and a large share still restrict entry for tattooed guests. That said, as tourism grows, the number of tattoo-friendly facilities has been rising steadily.

If you have a tattoo, there are three practical options. First, 'tattoo cover stickers': skin-colored waterproof patches sold at drugstores and online, though they do not suit tattoos too large to cover. Second, use a private bath (see below). Third, choose a facility that openly allows tattoos. JNTO officially recommends these same three approaches.

Standards vary by facility, so calling ahead or checking the website is the reliable move. In Hokkaido, Okinawa and major tourist areas, some facilities have relaxed their rules for international visitors. Where a 'no tattoos' sign is posted, respect it rather than trying to push in; that is the surest way to avoid trouble.

  • Cover stickers: skin-colored waterproof patches for smaller tattoos; sold at drugstores.
  • Use a private bath: soak without being seen; extra fee is roughly ¥1,000–3,000 per hour.
  • Pick a tattoo-friendly facility: JNTO and others publish lists of tattoo-OK baths.
  • Check ahead: standards differ by facility, so confirm by phone or website.

Mixed, Private and Family Baths

Baths are gender-separated as a rule, but some remote hot springs still have 'konyoku' (mixed bathing). Whether a bathing garment or towel is allowed varies by facility, so follow the posted notices or front-desk guidance. Mixed baths are declining as more facilities phase them out.

A 'kashikiri' (private) bath or 'family bath' is a private room you rent for your own group for a set time. Because no one else is present, it is a convenient option for families with small children and for people with tattoos. In most cases there is an added time-based fee on top of normal admission.

Private baths are popular and often require a reservation, especially at onsen ryokan, so book ahead if you want to be sure. Even in a private space, the basic rule of washing before you soak still applies.

Overheating, Hydration and Health Notes

Soaking too long in hot water can cause 'nobose'—dizziness or lightheadedness. If you are not used to it, start with short sessions and step out to rest once you are warm. A cooler tub and a slow, gentle soak put less strain on the body and suit first-timers.

Bathing makes you sweat, so hydrating before and after matters. Avoid bathing right after drinking alcohol or when very hungry or very full. Changing rooms and facilities usually have vending machines with cold water, milk and sports drinks, handy for rehydrating after your soak.

Japanese bathing culture grew up as a communal habit of cleansing the body, easing the day's fatigue and sharing the water. The steps and manners are practical ways to keep that shared water pleasant for everyone. Get the rules down, and an onsen or sento can be one of the most memorable parts of your trip to Japan.