01
Length Converter
Converts between 15 length and distance units instantly, showing the exact conversion factor…
Square metre to Tsubo
Converts square metre to tsubo with the exact defined factor. One square metre is 0.3025 tsubo.
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Enter a value to convert.
In short
One square metre is 0.3025 tsubo, so to convert square metre to tsubo you multiply by 0.3025, and to go back you multiply tsubo by 3.30579. 2 square metre is 0.605 tsubo, 5 is 1.5125 and 10 is 3.025. 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 Square metre to Tsubo
- 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 Square metre to Tsubo
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 square metre.
- Checking a figure someone else converted.
- Getting the exact factor to reuse in a spreadsheet.
Details
| 1 Square metre | 0.3025 Tsubo |
|---|---|
| 1 Tsubo | 3.30579 Square metre |
| 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 tsubo = square metre × 0.3025, 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 square metre is 0.3025 tsubo, and one tsubo is 3.30579 square metre. It is a defined value rather than a measurement, so it does not change and the conversion is exact in both directions.
Are there any usage caps on the Square metre to Tsubo?
There is no cost and no cap. The Square metre to Tsubo is not a demo of a paid product, so nothing is held back or watermarked.
Is what I paste into the Square metre to Tsubo stored?
No. The Square metre to Tsubo runs entirely in your browser using JavaScript. Because the work happens locally, the utility also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What formula does the Square metre to Tsubo use?
It uses tsubo = square metre × 0.3025, 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.
Give me a worked example.
Enter 10 square metre and the Square metre to Tsubo returns 3.025 tsubo.
What problem does the Square metre to Tsubo solve?
Typical uses: reading a listing or a document quoted in square metre. 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 Square metre is 0.3025 Tsubo. 1 Tsubo is 3.30579 Square metre. 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.
How precise is the result?
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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