Convert Tsubo to Square Kilometer
Convert tsubos to square kilometers instantly. 1 tsubo = 3.3058e-6 square kilometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Kilometer to Tsubo converter for the reverse conversion.
Units explained
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
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 to Square Kilometer conversion formula
The relationship between tsubos and square kilometers:
To convert tsubos to square kilometers, multiply the value in tsubos by 3.3058e-6. To reverse, multiply square kilometers by 302498.6387561256.
How to use this converter
Type a value into the calculator. The result in square kilometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Square Kilometer to Tsubo converter for the reverse direction.
Step-by-step: convert tsubos to square kilometers
- Write down the value in tsubos (tsubo).
- Multiply that value by the factor 3.3058e-6.
- The product is the equivalent value in square kilometers (km²).
- To reverse, multiply the square kilometer value by 302498.6387561256.
Worked examples
Example 1 — Convert 1 tsubo to km²:
1 × 3.3058e-6 = 3.3058e-6 km²
Example 2 — Convert 100 tsubo to km²:
100 × 3.3058e-6 = 0.00033058 km²
Real-world example — Adult height conversion
A 1.8-tsubo-tall person measures a value in square kilometers that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.
1.8 tsubo × 3.3058e-6 = 5.95044e-6 km²
Real-world example — Fabric purchase length
Two tsubos of fabric equals a value in square kilometers essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.
2 tsubo × 3.3058e-6 = 6.6116e-6 km²
Real-world example — Maritime depth conversion
A 10-tsubo sounding depth converts cleanly into square kilometers. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 tsubo × 3.3058e-6 = 3.3058e-5 km²
Tsubo to Square Kilometer conversion table
Standard reference values for converting tsubos to square kilometers:
| Tsubo [tsubo] | Square Kilometer [km²] |
|---|---|
| 0.01 | 3.3058e-8 |
| 0.1 | 3.3058e-7 |
| 1 | 3.3058e-6 |
| 2 | 6.6116e-6 |
| 3 | 9.9174e-6 |
| 4 | 1.32232e-5 |
| 5 | 1.6529e-5 |
| 10 | 3.3058e-5 |
| 20 | 6.6116e-5 |
| 30 | 9.9174e-5 |
| 40 | 0.000132232 |
| 50 | 0.00016529 |
| 100 | 0.00033058 |
| 500 | 0.0016529 |
| 1000 | 0.0033058 |
Frequently asked questions
How many square kilometers is 1 tsubo?
How do I convert tsubos to square kilometers?
How do I convert square kilometers back to tsubos?
How many square kilometers is 100 tsubos?
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Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 tsubo = 3.3058e-6 km²) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.