Convert Square Kilometer to Tsubo
Convert square kilometers to tsubos instantly. 1 square kilometer = 302498.6387561256 tsubo — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Tsubo to Square Kilometer converter for the reverse conversion.
Units explained
Square Kilometer
A square kilometer is a metric unit of area equal to 1,000,000 m² (one million square meters), or 100 hectares. It is used for measuring large land areas, regional geography, and country-scale statistics.
Derived by squaring the kilometer (1000 m). The kilo- prefix comes from the Greek 'chilioi' (thousand).
Square kilometers express the area of cities, districts, lakes, forests, and entire countries. India's total area is approximately 3,287,263 km². 1 km² equals 100 hectares or about 247.105 acres.
Kilometer has been part of the metric system since 1795.
Tsubo
A tsubo is a Japanese unit of area equal to approximately 3.3058 m² (about 35.58 square feet). It is functionally identical to the Korean pyeong.
Defined as a 6-by-6 shaku square; the shaku is the traditional Japanese foot. Standardized as 400/121 m² in modern Japanese law.
Tsubos remain in widespread use in Japanese real estate, particularly for residential apartments and small commercial spaces. Property listings often cite both tsubo and square meters.
Traditional Japanese unit; legally retained in Japan for real estate.
Square Kilometer to Tsubo conversion formula
The relationship between square kilometers and tsubos:
To convert square kilometers to tsubos, multiply the value in square kilometers by 302498.6387561256. To reverse, multiply tsubos by 3.3058e-6.
How to use this converter
Type a value into the calculator. The result in tsubos updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Tsubo to Square Kilometer converter for the reverse direction.
Step-by-step: convert square kilometers to tsubos
- Write down the value in square kilometers (km²).
- Multiply that value by the factor 302498.6387561256.
- The product is the equivalent value in tsubos (tsubo).
- To reverse, multiply the tsubo value by 3.3058e-6.
Worked examples
Example 1 — Convert 1 km² to tsubo:
1 × 302498.6387561256 = 302498.6387561256 tsubo
Example 2 — Convert 100 km² to tsubo:
100 × 302498.6387561256 = 3.024986e+7 tsubo
Square Kilometer to Tsubo conversion table
Standard reference values for converting square kilometers to tsubos:
| Square Kilometer [km²] | Tsubo [tsubo] |
|---|---|
| 0.01 | 3024.9863875613 |
| 0.1 | 30249.8638756126 |
| 1 | 302498.6387561256 |
| 2 | 604997.2775122512 |
| 3 | 907495.9162683767 |
| 4 | 1209994.5550245023 |
| 5 | 1512493.193780628 |
| 10 | 3024986.3875612561 |
| 20 | 6049972.7751225121 |
| 30 | 9074959.1626837682 |
| 40 | 1.209995e+7 |
| 50 | 1.512493e+7 |
| 100 | 3.024986e+7 |
| 500 | 1.512493e+8 |
| 1000 | 3.024986e+8 |
Frequently asked questions
How many tsubos is 1 square kilometer?
How do I convert square kilometers to tsubos?
How do I convert tsubos back to square kilometers?
How many tsubos is 100 square kilometers?
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Metric / SI (15 units)
Imperial / US Customary (15 units)
US Survey (5 units)
Indian Subcontinent (16 units)
Other Regional (10 units)
Scientific / Physics (5 units)
Sources & references
Conversion factor (1 km² = 302498.6387561256 tsubo) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.