Convert Arpent (French) to Chō
Convert arpents to chōs instantly. 1 arpent (french) = 0.4256173014 chō — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Chō to Arpent (French) converter for the reverse conversion.
Units explained
Arpent (French)
A French arpent is a historical unit of land area used in pre-metric France, approximately 4221 m² (close to one acre).
Originated as a medieval French land unit; varied considerably by province. The 'arpent de Paris' was officially fixed at 100 perches squared, the perche being 18 pieds.
French arpents appear in pre-revolutionary French land records and in genealogical research. The unit was largely abolished after the French Revolution in favor of metric units.
Medieval French origin; abolished after the French Revolution in favor of metric.
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.
Arpent (French) to Chō conversion formula
The relationship between arpents and chōs:
To convert arpents to chōs, multiply the value in arpents by 0.4256173014. To reverse, multiply chōs by 2.3495285477.
How to use this converter
Type a value into the calculator. The result in chōs updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Chō to Arpent (French) converter for the reverse direction.
Step-by-step: convert arpents to chōs
- Write down the value in arpents (arpent).
- Multiply that value by the factor 0.4256173014.
- The product is the equivalent value in chōs (chō).
- To reverse, multiply the chō value by 2.3495285477.
Worked examples
Example 1 — Convert 1 arpent to chō:
1 × 0.4256173014 = 0.4256173014 chō
Example 2 — Convert 100 arpent to chō:
100 × 0.4256173014 = 42.5617301379 chō
Real-world example — Endurance race distances
A 50-arpent (french) cycling or running race converts to a recognizable distance in chōs. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 arpent × 0.4256173014 = 21.2808650689 chō
Real-world example — Maritime exclusion zone
A 200-arpent (french) exclusion zone (a common maritime boundary) converts to a different value in chōs that's useful when describing the same zone in everyday land-distance units.
200 arpent × 0.4256173014 = 85.1234602757 chō
Real-world example — Coastal cruise distances
A 10-arpent (french) coastal sailing route converts to a different value in chōs — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 arpent × 0.4256173014 = 4.2561730138 chō
Arpent (French) to Chō conversion table
Standard reference values for converting arpents to chōs:
| Arpent (French) [arpent] | Chō [chō] |
|---|---|
| 0.01 | 0.004256173 |
| 0.1 | 0.0425617301 |
| 1 | 0.4256173014 |
| 2 | 0.8512346028 |
| 3 | 1.2768519041 |
| 4 | 1.7024692055 |
| 5 | 2.1280865069 |
| 10 | 4.2561730138 |
| 20 | 8.5123460276 |
| 30 | 12.7685190414 |
| 40 | 17.0246920551 |
| 50 | 21.2808650689 |
| 100 | 42.5617301379 |
| 500 | 212.8086506893 |
| 1000 | 425.6173013786 |
Frequently asked questions
How many chōs is 1 arpent (french)?
How do I convert arpents to chōs?
How do I convert chōs back to arpents?
How many chōs is 100 arpents?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (3 units)
Other Regional (9 units)
Sources & references
Conversion factor (1 arpent = 0.4256173014 chō) 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.