01
Length Converter
Converts between 15 length and distance units instantly, showing the exact conversion factor…
Tsubo to Square metre
Converts tsubo to square metre with the exact defined factor. One tsubo is 3.30579 square metre.
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Enter a value to convert.
In short
One tsubo is 3.30579 square metre, so to convert tsubo to square metre you multiply by 3.30579, and to go back you multiply square metre by 0.3025. 2 tsubo is 6.61157 square metre, 5 is 16.5289 and 10 is 33.0579. A tsubo is exactly 400/121 square metres — an odd-looking fraction that comes from it being defined as the area of two tatami mats, six shaku square. It works out at 3.3058 m2 or 35.583 ft2. The Korean pyeong is the same unit under a different name, which is why a Japanese and a Korean floor area convert to each other one for one. The tsubo is used in Japan, where every property listing, floor plan and construction quote is priced per tsubo.
How to use the Tsubo to Square metre
- Type the value you want to convert.
- Pick the unit you are converting from and the unit you want.
- The converted value and the exact conversion factor are shown instantly.
About the Tsubo to Square metre
A tsubo is exactly 400/121 square metres — an odd-looking fraction that comes from it being defined as the area of two tatami mats, six shaku square. It works out at 3.3058 m2 or 35.583 ft2. The Korean pyeong is the same unit under a different name, which is why a Japanese and a Korean floor area convert to each other one for one.
What people use it for
- Reading a listing or a document quoted in tsubo.
- Checking a figure someone else converted.
- Getting the exact factor to reuse in a spreadsheet.
Details
| 1 Tsubo | 3.30579 Square metre |
|---|---|
| 1 Square metre | 0.3025 Tsubo |
| Definition | 1 tsubo = 400/121 m2 exactly = 3.30579 m2 = 35.583 ft2. A Korean pyeong is identical. |
| Used in | Japan, where every property listing, floor plan and construction quote is priced per tsubo |
| Conversion type | Exact multiplication — both units are defined against the Square metre |
The maths behind it
This tool uses square metre = tsubo × 3.30579, an exact defined factor with no offset. Every intermediate value is shown on screen, so the result can be checked by hand.
1 tsubo = 400/121 m2 exactly = 3.30579 m2 = 35.583 ft2. A Korean pyeong is identical.
Frequently asked questions
Why is a tsubo such an awkward number of square metres?
Because it was not derived from the metre. A tsubo is one square ken, and a ken is six shaku — the traditional Japanese units. When Japan fixed the shaku against the metre as 10/33 m, the tsubo fell out as 400/121 m2 exactly. The fraction is the price of an exact conversion rather than a rounded one.
What is the exact factor?
One tsubo is 3.30579 square metre, and one square metre is 0.3025 tsubo. It is a defined value rather than a measurement, so it does not change and the conversion is exact in both directions.
Is the Tsubo to Square metre free, or is there a paid tier?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Is the Tsubo to Square metre safe to use with private information?
No. The Tsubo to Square metre runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
How is the result calculated?
It uses square metre = tsubo × 3.30579, an exact defined factor with no offset. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What do I get if I try it?
Enter 10 tsubo and the Tsubo to Square metre returns 33.0579 square metre.
What problem does the Tsubo to Square metre solve?
The jobs it is built for: reading a listing or a document quoted in tsubo. Checking a figure someone else converted. Getting the exact factor to reuse in a spreadsheet. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything to watch out for?
1 tsubo = 400/121 m2 exactly = 3.30579 m2 = 35.583 ft2. A Korean pyeong is identical.
Which values should I know?
1 Tsubo is 3.30579 Square metre. 1 Square metre is 0.3025 Tsubo. Definition is 1 tsubo = 400/121 m2 exactly = 3.30579 m2 = 35.583 ft2. A Korean pyeong is identical.. These are printed on the page itself, so you do not have to take them on trust.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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