Units

Tatami to Square Meters Calculator

Value (tatami)

tatami

m² value

9.9372 m²

1 tatami =: 1.6562 m²
tatami from same number of m²: 3.6228 tatami

Convert tatami mats to square meters (standard Nagoya-size estimate).

By Kim H. · Reviewed by Dr. Lena Ortiz · Updated 2026-06-03

How to use this calculator

Enter the amount in tatami.
Read the equivalent value in m².
The '1 tatami =' line is the exact conversion factor.
Use the reverse line to convert m² back to tatami.

Formula

m² = tatami × 1.6562

tatami — the value you are converting
1.6562 — m² in one tatami

Worked example

A 6-tatami room is about 6 × 1.6562 ≈ 9.94 square meters — a common Japanese room size.

Frequently asked questions

How big is one tatami?

About 1.6562 m² for a common size, though it varies by region.

Why do sizes vary?

Kyoto, Nagoya, and Tokyo standards differ slightly.

How many tatami in a tsubo?

Two tatami equal about one tsubo.

How to reverse?

Divide m² by 1.6562.

Why is area given in tatami?

Japanese room size is traditionally counted in mats (jō).

Related calculators

Kim H. · Author

Reviewed by Dr. Lena Ortiz · Updated 2026-06-03

Sources

NIST — Unit conversions — Standard conversion factors.

Methodology · Report an error

Embed this calculator

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View answer.json (AI feed)

{
  "tool": "tatami-to-sqm",
  "question": "How does the Tatami to Square Meters Calculator work?",
  "answer": "Convert tatami mats to square meters (standard Nagoya-size estimate).",
  "formula": "m² = tatami × 1.6562",
  "inputs": [
    {
      "id": "value",
      "label": "Value (tatami)",
      "unit": "tatami"
    }
  ],
  "sources": [
    {
      "name": "NIST — Unit conversions",
      "url": "https://www.nist.gov/pml/owm",
      "note": "Standard conversion factors."
    }
  ],
  "updated": "2026-06-03"
}