Area conversion (m² → tsubo / tatami)
Input
mode=area, value=35, unit=m², japan=ON, tatami=0.88 × 1.76
Output
35 m² = 10.5873 tsubo = 22.5981 tatami
m²↔Tsubo↔Tatami↔m↔mm Converter + Quick Table
Calculations are always done in SI units (m / m²), and major units are shown together.
Tatami conversion uses explicit dimensions (m×m), so definition differences stay visible.
Single input, simultaneous outputs
Generate fixed-decimal quick tables
State-preserving shareable URL
What this tool covers
- Switch between Length and Area and see key units at the same time.
- In Area mode, tsubo and tatami appear only when Japanese units are enabled.
- Tatami values are computed from your long/short edge inputs, so the basis is explicit.
- Quick tables support A4/Letter printing, PDF save, and CSV export.
How to use
- Select Length or Area, then enter one value and its input unit.
- If you use Japanese units in Area mode, confirm or enter tatami dimensions.
- Copy any result value in one click from the unit cards.
- Set range, step, fixed decimals, rounding, and paper format to generate the table.
Sample
Length conversion (m → mm / ft / yd)
Input
mode=length, value=12.5, unit=m
Output
12.5 m = 12500 mm = 41.0105 ft = 13.6702 yd
Formulas
- SI value = input value × (input-to-SI factor)
- Output value = SI value ÷ (output-to-SI factor)
- 1 tsubo = 400 / 121 m²
- 1 tatami = long edge (m) × short edge (m)
Notes
- Tatami dimensions vary. This page converts using the tatami size you enter.
- Displayed rounded values can differ from internal calculation precision.
- For legal or contractual use, always follow the definition stated in the contract.
FAQ
Why do I need to enter tatami dimensions?
Tatami size differs by region and property type. Using explicit dimensions prevents hidden definition mismatches.
Which definition is used for tsubo?
This tool uses 1 tsubo = 400/121 m² (about 3.305785 m²).
Can I print the quick table?
Yes. You can choose A4 or Letter and portrait or landscape, then print or save as PDF.
What is restored from a shared URL?
Mode, value, unit, Japanese unit toggle, tatami size, and quick table settings are restored.
Is my conversion data sent to a server?
No. Conversion and table generation run entirely in your browser.