Area Converter
Convert between m², acres, hectares, square feet, and Japanese units like tsubo and jo. Enter a value, pick a unit, and see every conversion at once.
Last updated:
Input
m²
Input unit
Square meter（m²）
Result
100 m² (Square meter) converted to square meters
100m²
| Unit | Symbol | Converted value |
|---|---|---|
| Square millimeter | mm² | 100,000,000 |
| Square centimeter | cm² | 1,000,000 |
| Square meter | m² | 100 |
| Square kilometer | km² | 0.0001 |
| Are | a | 1 |
| Hectare | ha | 0.01 |
| Tsubo | 坪 | 30.25 |
| Jo (tatami mat) | 畳 | 61.728395 |
| Square inch | in² | 155,000.310001 |
| Square foot | ft² | 1,076.391042 |
| Square mile | mi² | 3.8610e-5 |
| Acre | ac | 0.024711 |
| Tan | 反 | 0.100833 |
| Cho | 町 | 0.010083 |
How it works
- This tool converts between 14 area units: square millimeter (mm²), square centimeter (cm²), square meter (m²), square kilometer (km²), are (a), hectare (ha), tsubo, jo, square inch (in²), square foot (ft²), square mile (mi²), acre (ac), tan, and cho.
- The square meter (m²), the SI unit of area, is used as the base. Every input is first converted to square meters and then to the target unit, so any pair of units gives a consistent result.
- Japanese units are calculated as: 1 tsubo ≈ 3.305785 m², 1 jo = 1.62 m², 1 tan = 300 tsubo, and 1 cho = 3,000 tsubo. The acre uses the international acre (4046.8564224 m²).
- Just enter the area you want to convert and pick its unit. All conversions appear in the table, with the square meter value shown prominently as the headline figure.
- This is handy for comparing the tsubo, jo, tan, and cho units common in Japanese real estate and land records against metric and imperial units side by side.
- Decimals are rounded to a readable number of digits, and very large or very small values may switch to scientific notation. For contracts, registration, or other cases that demand exact figures, please double-check the source values.
Frequently asked questions
- How does the area converter calculate its results?
- Every value is first converted into square meters (m², the SI base) and then into the target unit. Routing every conversion through m² keeps results consistent no matter which two units you compare.
- How big is one tsubo or one tatami (jō) in square meters?
- One tsubo is about 3.305785 m² and one tatami mat (jō) is defined here as 1.62 m². These traditional Japanese units appear alongside metric and imperial units like hectares and acres in the same table.
- Which acre definition does this tool use?
- It uses the international acre, exactly 4046.8564224 m². Because results are rounded for display, check the original figures for contracts or land registration where precision matters.
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