Chō (area) to Square Kilometers (chō to km²)
1 chō (area) equals 0.009917355372 square kilometers (rounded).
How to convert chō (area) to square kilometers
To convert chō (area) to square kilometers, multiply the number of chō (area) by 0.009917355372. The factor is rounded to 10 significant digits. To go the other way, multiply square kilometers by 100.8333333 (rounded).
square kilometers = chō (area) × 0.009917355372
Example: 10 chō (area) = 0.09917355372 square kilometers.
About these units
Chō (area) (chō)
3,000 tsubo, about 9,917 m² (roughly one hectare; 2.45 acres). Used for farmland in Japan.
Almost exactly a hectare, the cho is the largest of the everyday Japanese land units. It is 3,000 tsubo, or 1,200,000/121 square metres, about 9,917, which is 0.9917 hectare or roughly 2.45 acres. It is also 100 se or 10 tan, and when no fractional part follows it is often written cho-bu.
Because it is so near a hectare, it is a convenient mental bridge for anyone moving between traditional and metric figures. In Japan it has been used for farmland, and it sits at the top of the tsubo, se and tan ladder.
The name is shared with a unit of length, so the area sense needs to be stated. The area figure used here follows from the 10/33 metre shaku fixed by the 1891 Meiji law, and the 1951 Measurements Law took the traditional units out of official use from 1959.
1 chō (area) = 9,917.355372 square meters (approximately).
Sources: Wikipedia: Japanese units of measurement; Wikipedia: Shaku (unit); Wikipedia: Tsubo
Square Kilometer (km²)
One million square meters (100 hectares). Used for the area of cities, countries and lakes.
Metric land measure took a surprisingly long time to settle on the kilometer. The meter was defined in 1799, yet people initially preferred the myriameter, 10,000 meters, and the French phrase myriamètres par heure was still in print in 1802. The Netherlands adopted the kilometer in 1817 under the name mijl. Once the kilometer was established, the square kilometer followed naturally as the unit for areas too large to count comfortably in hectares or square meters.
One square kilometer is 1,000,000 square meters, or 100 hectares, about 0.3861 square miles or 247.1 acres. A useful picture comes from history: many medieval European cities were enclosed by walls around roughly a square kilometer, with Delft at about 0.9 km² and Lucca at about 1.09 km². A standard 18-hole golf course of 6,000 meters needs about 0.8 km². The symbol km² means the square of a kilometer, not a thousand square meters. The planned Square Kilometre Array radio telescope takes its name from the collecting area it aims for.
1 square kilometer = 1,000,000 square meters (exactly).
Sources: Wikipedia: Square kilometre; Wikipedia: Kilometres per hour
Related conversions
- Square kilometers to chō (area) (reverse)
- Chō (area) to square meters
- Chō (area) to hectares
- Chō (area) to square inches
- Chō (area) to square feet
- Chō (area) to square yards
- Chō (area) to acres
- Chō (area) to square miles
- Square meters to square kilometers
- Hectares to square kilometers
- Square inches to square kilometers
- Square feet to square kilometers
- Square yards to square kilometers
- Acres to square kilometers
- Square miles to square kilometers
- Square centimeters to square kilometers
- Square millimeters to square kilometers
- Tsubo to square kilometers
- Pyeong to square kilometers
- Rai (Thai) to square kilometers
See all area units.