Convert Chō to Hectare
Convert chōs to hectares instantly. 1 chō = 0.991736 hectare — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Hectare 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.
Hectare
A hectare is a metric unit of area equal to 10,000 square meters, or one square hectometer. It is the most widely used metric unit for land measurement worldwide.
Defined as 100 ares, equal to one square hectometer. The name was introduced in 1795 in France as part of the metric system.
Hectares are the standard unit for agricultural land measurement worldwide except in the US (which uses acres). 1 hectare equals 2.47105 acres. In India, hectares are used in modern agricultural census and land records alongside traditional regional units.
Adopted in France in 1795; standardized internationally through the SI system.
Chō to Hectare conversion formula
The relationship between chōs and hectares:
To convert chōs to hectares, multiply the value in chōs by 0.991736. To reverse, multiply hectares by 1.0083328628.
How to use this converter
Type a value into the calculator. The result in hectares updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Hectare to Chō converter for the reverse direction.
Step-by-step: convert chōs to hectares
- Write down the value in chōs (chō).
- Multiply that value by the factor 0.991736.
- The product is the equivalent value in hectares (ha).
- To reverse, multiply the hectare value by 1.0083328628.
Worked examples
Example 1 — Convert 1 chō to ha:
1 × 0.991736 = 0.991736 ha
Example 2 — Convert 100 chō to ha:
100 × 0.991736 = 99.1736 ha
Real-world example — Maritime exclusion zone
A 200-chō exclusion zone (a common maritime boundary) converts to a different value in hectares that's useful when describing the same zone in everyday land-distance units.
200 chō × 0.991736 = 198.3472 ha
Real-world example — Coastal cruise distances
A 10-chō coastal sailing route converts to a different value in hectares — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 chō × 0.991736 = 9.91736 ha
Real-world example — Road-sign distances across systems
A 100-chō road sign converts cleanly into hectares — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 chō × 0.991736 = 99.1736 ha
Chō to Hectare conversion table
Standard reference values for converting chōs to hectares:
| Chō [chō] | Hectare [ha] |
|---|---|
| 0.01 | 0.00991736 |
| 0.1 | 0.0991736 |
| 1 | 0.991736 |
| 2 | 1.983472 |
| 3 | 2.975208 |
| 4 | 3.966944 |
| 5 | 4.95868 |
| 10 | 9.91736 |
| 20 | 19.83472 |
| 30 | 29.75208 |
| 40 | 39.66944 |
| 50 | 49.5868 |
| 100 | 99.1736 |
| 500 | 495.868 |
| 1000 | 991.736 |
Frequently asked questions
How many hectares is 1 chō?
How do I convert chōs to hectares?
How do I convert hectares back to chōs?
How many hectares is 100 chōs?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 chō = 0.991736 ha) 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.