Convert Chō to Square Kilometer
Convert chōs to square kilometers instantly. 1 chō = 0.00991736 square kilometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Kilometer to Chō converter for the reverse conversion.
Units explained
Chō
A chō is a Japanese unit of large-scale area equal to approximately 9917.36 m² (about 0.991 hectare or 2.45 acres). It equals 3,000 tsubo.
Traditional Japanese land area unit, used historically for rice paddies and large estates.
Chōs appear in Japanese agricultural records and historical land documents. Modern usage favors hectares for new transactions but legacy records remain.
Traditional Japanese unit; standardized via the tsubo definition.
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.
Chō to Square Kilometer conversion formula
The relationship between chōs and square kilometers:
To convert chōs to square kilometers, multiply the value in chōs by 0.00991736. To reverse, multiply square kilometers by 100.8332862778.
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 Chō converter for the reverse direction.
Step-by-step: convert chōs to square kilometers
- Write down the value in chōs (chō).
- Multiply that value by the factor 0.00991736.
- The product is the equivalent value in square kilometers (km²).
- To reverse, multiply the square kilometer value by 100.8332862778.
Worked examples
Example 1 — Convert 1 chō to km²:
1 × 0.00991736 = 0.00991736 km²
Example 2 — Convert 100 chō to km²:
100 × 0.00991736 = 0.991736 km²
Real-world example — Endurance race distances
A 50-chō cycling or running race converts to a recognizable distance in square kilometers. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 chō × 0.00991736 = 0.495868 km²
Real-world example — Maritime exclusion zone
A 200-chō exclusion zone (a common maritime boundary) converts to a different value in square kilometers that's useful when describing the same zone in everyday land-distance units.
200 chō × 0.00991736 = 1.983472 km²
Real-world example — Coastal cruise distances
A 10-chō coastal sailing route converts to a different value in square kilometers — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 chō × 0.00991736 = 0.0991736 km²
Chō to Square Kilometer conversion table
Standard reference values for converting chōs to square kilometers:
| Chō [chō] | Square Kilometer [km²] |
|---|---|
| 0.01 | 9.91736e-5 |
| 0.1 | 0.000991736 |
| 1 | 0.00991736 |
| 2 | 0.01983472 |
| 3 | 0.02975208 |
| 4 | 0.03966944 |
| 5 | 0.0495868 |
| 10 | 0.0991736 |
| 20 | 0.1983472 |
| 30 | 0.2975208 |
| 40 | 0.3966944 |
| 50 | 0.495868 |
| 100 | 0.991736 |
| 500 | 4.95868 |
| 1000 | 9.91736 |
Frequently asked questions
How many square kilometers is 1 chō?
How do I convert chōs to square kilometers?
How do I convert square kilometers back to chōs?
How many square kilometers is 100 chōs?
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Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 chō = 0.00991736 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 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.