Tatami Rooms: Living on Japanese Straw Mats

Discover tatami, the woven rush mats of Japanese rooms: how they are made, how room sizes work, their grassy scent, care tips and etiquette for guests.

Published October 18, 2026 at 6:44 AM JST | By Tokyo Paul

Quick answer: Tatami are firm, rectangular floor mats covered in woven igusa rush, used in traditional Japanese rooms called washitsu. Room size is counted in mats, typically six or eight for a private room, and guests remove shoes and slippers before stepping on them.

What Is a Tatami Room?

A tatami room, or washitsu, is a traditional Japanese-style room whose floor is covered with firm, rectangular, softly woven mats. Walk into one and the first things you notice are the gentle give underfoot and a fresh, grassy scent. Tatami rooms appear in homes, ryokan (traditional Japanese inns), temples and tea houses, and they are one of the easiest ways for a visitor to feel the everyday rhythm of Japanese life. This guide explains what tatami is made of, how rooms are measured by mat, how the mats are cared for, and how to behave politely when you step onto one.

Because the same room can serve for dining, relaxing and sleeping, a tatami room also teaches a lot about how Japanese homes have traditionally used space.

What Is Tatami Made Of?

The surface of a tatami mat is a tightly woven cover of igusa, a type of soft rush, and the core underneath was traditionally made of sewn rice straw. Many modern mats use compressed wood chip board or foam in the core to make them lighter and more durable. The long sides are usually edged with a strip of cloth called heri, which may be plain or patterned, and which historically could signal the rank of the people using the room. The overall result is a mat that is roughly twice as long as it is wide, with a thickness of about five to six centimeters.

Weaving the rush takes thousands of stalks for each mat. Although much of the rush used today is imported, the area around Yatsushiro in Kumamoto Prefecture has long been known as Japan's leading source of domestic igusa. Fresh tatami is pale green and smells grassy, and over a few weeks the color and scent soften into a warm, golden hay tone.

The history of tatami is long. The oldest surviving example dates to the Nara period (710 to 794) and is kept at the Shosoin repository at Todai-ji in Nara, where it is believed to have been used as a kind of bed. From the Kamakura and Muromachi periods, tatami began to cover entire rooms but remained a status symbol for nobles and samurai. The tea ceremony and the sukiya style of architecture helped spread it in the Edo period, and townspeople had tatami in their homes by the late Edo period, with farmers following in the early Meiji era.

How Are Tatami Rooms Measured?

In Japan, room size is traditionally counted in jo, which means the number of tatami mats that fit on the floor. Real-estate listings often show rooms as 4.5, 6 or 8 mats, with 6 and 8 being typical for a private room. Because mat sizes vary by region, a six-mat room in one city is slightly different from a six-mat room in another. Three standard sizes are widely cited: the Kyoma (about 191 by 95.5 centimeters) is used in the Kansai area and further west, the Chukyoma (about 182 by 91 centimeters) around Nagoya, and the Edoma (about 176 by 88 centimeters) in Tokyo and the Kanto area and beyond. Apartment and condominium buildings often use a smaller size.

The arrangement of mats follows a custom too. In the layout considered auspicious, the corners of mats meet in a T shape rather than a cross, which often calls for half-sized mats. The cross-shaped layout, in which four corners meet, was traditionally avoided in homes and associated with funerals, so you will rarely see it today. These details are subtle, but spotting them is a fun way to notice how much thought goes into a traditional room.

How Do People Use a Tatami Room?

A tatami room does not have a fixed purpose. In the evening, a futon (a folding mattress and bedding set) is laid out for sleeping, and in the morning it is folded away into a closet called an oshiire. During the day, a low table appears for meals or tea, and people sit directly on the mats, on flat cushions called zabuton, or on low legless chairs. In a formal guest room you may find a tokonoma, a decorative alcove in which a hanging scroll or seasonal flower arrangement is displayed.

In winter, a kotatsu, a low table with a heater under a quilt, is often placed on top of the tatami, which is why the two are so closely linked in Japanese homes. Sliding paper doors (shoji) and sliding wall panels (fusuma) complete the picture, allowing the same space to be opened up or divided depending on the occasion.

Etiquette, Care and Where To Stay on Tatami

Take off your shoes before entering, and walk in socks or bare feet. If you wear house slippers in the corridor, leave them outside the tatami area as well, since the mats are meant to be touched only by clean feet. Move gently, do not drag heavy bags across the surface, and place luggage on a stand or in a corner if one is provided. If you are invited to sit, a zabuton cushion will usually be offered.

At a ryokan, the staff will typically show you around, explain where the futon is stored and set it out in the evening. If anything seems unclear, simply ask. Visitors who follow these small courtesies are usually welcomed warmly, and the experience of sleeping on a futon over tatami is something many travelers remember fondly.

Caring for the mats is simple too. Tatami likes air and dryness. Ventilate the room regularly, wipe up spills at once and avoid covering the mats for long periods. Vacuuming keeps dust away, and airing the mats outdoors a couple of times a year, out of direct sunlight, helps too. With proper care, tatami can last at least ten years. After a few years the mats can be flipped to expose the other side of the rush cover, and the cover alone can later be replaced, so there is no need to discard the whole mat. These simple habits explain why tatami is considered both practical and sustainable.

The easiest way for most visitors to experience a tatami room is to stay at a ryokan, where the room is typically set up with a low table in the daytime and futon bedding in the evening. Some hotels also offer Japanese-style rooms, and guesthouses and traditional homes may have them as well. If you would like a tatami room, say so when you book, and be prepared to share any dietary needs and arrival times in advance. A night on tatami, with the soft scent of rush and the gentle lighting through paper screens, is a lasting memory for many travelers.

Quick Takeaways

Tatami mats are woven from igusa rush over a firm core, edged with heri, and used to measure the size of a room. Their sweet, grassy scent fades gradually from green to golden, and the mats suit sitting, dining and sleeping alike. As a guest, remove your shoes and slippers, treat the surface gently and enjoy the calm that a washitsu offers. If you plan to stay at a ryokan, you will meet tatami at its best, and it makes a wonderful contrast with a modern hotel stay.

Frequently Asked Questions

What are tatami mats made of?

Tatami mats have a woven cover of igusa, a soft rush plant, over a core traditionally made of sewn rice straw. Modern mats may use compressed wood chip board or foam in the core. The long edges are usually bound with a cloth strip called heri.

How big is a tatami mat?

A tatami mat is about twice as long as it is wide and varies by region. The Edoma used in Tokyo is about 176 by 88 centimeters, the Chukyoma around Nagoya is about 182 by 91, and the Kyoma in Kansai is about 191 by 95.5 centimeters.

Do you wear shoes or slippers on tatami?

No. Remove your shoes at the entrance and walk on tatami in socks or bare feet. House slippers are also left outside the tatami area. This keeps the rush surface clean and is expected at ryokan and homes.