Japanese Tatami Mat Converter｜Instantly Convert Between Kyōma, Edoma, & Danchima
Easily calculate the actual area of a Japanese-style room with our Tatami Size Converter. This tool helps you understand and convert room sizes between different regional tatami standards like Edoma (Tokyo) and Kyōma (Kyoto), providing the total area in square meters and an equivalent mat count for all major types.
💡 Tool Overview
- Regional Standard Conversion: Instantly see how a "6-mat room" in Tokyo (Edoma) compares to one in Kyoto (Kyōma) or a modern apartment (Danchima).
- Square Meter Calculation: Automatically calculates the total floor area (m²) based on the number of mats and their regional standard.
- Side-by-Side Comparison: The results table shows the equivalent mat count for all major standards simultaneously, helping you accurately visualize and compare property sizes.
- Ideal for Real Estate: A must-use tool for anyone renting, buying, or furnishing a property in Japan, ensuring you understand the true size of a room.
🧐 Frequently Asked Questions
Q. Why are there different sizes for tatami mats?
A. The size differences stem from historical variations in architectural methods between regions in Japan. In the Kansai region (Kyoto, Osaka), rooms were designed around the tatami mats (Kyōma standard), which were made first. In the Kantō region (Tokyo), the house frame was built first, and the tatami mats were cut to fit between the pillars, resulting in a slightly smaller standard (Edoma). Danchima is a more modern, smaller standard created for post-war public housing complexes (danchi).
Q. Which tatami standard is the largest?
A. The Kyōma (京間) standard is the largest and is traditionally found in western Japan. The Edoma (江戸間) is the most common standard in eastern Japan and is smaller than Kyōma. The Danchima (団地間) is typically the smallest and is found in many modern apartment buildings across the country.
📚 A Quick Guide to Tatami Standards
In Japan, room size is traditionally measured not in square meters or feet, but by the number of tatami mats that can fit inside it. This unit is called a "jō" (畳). For example, a "rokujōma" (六畳間) is a "6-mat room." However, a "6-mat room" doesn't always have the same area, because the size of an individual tatami mat varies by region.
This is where the standards become important. A 6-mat Kyōma room is approximately 10.94 m², while a 6-mat Edoma room is only about 9.29 m²—a difference of nearly 15%. This converter helps you bridge that gap, making it an essential tool for accurately comparing Japanese real estate listings or planning an interior design project. Understanding these subtle differences is key to knowing exactly how much space you're getting.