Convert Chō to Dunam (Ottoman)
Convert chōs to dunams instantly. 1 chō = 7.4131858275 dunam (ottoman) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dunam (Ottoman) 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.
Dunam (Ottoman)
An Ottoman dunam was a historical unit of area used across the Ottoman Empire, approximately 1337.8 m². The value varied somewhat by region.
Originated as the area a yoke of oxen could plow in a day, a measure used across much of the Mediterranean. Standardized in different regional ways.
Ottoman dunams appear in pre-20th-century land records across the former Ottoman Empire. Modern usage has shifted to metric dunams (exactly 1000 m²).
Traditional Ottoman unit; largely superseded by metric dunam.
Chō to Dunam (Ottoman) conversion formula
The relationship between chōs and dunams:
To convert chōs to dunams, multiply the value in chōs by 7.4131858275. To reverse, multiply dunams by 0.1348947704.
How to use this converter
Type a value into the calculator. The result in dunams updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Dunam (Ottoman) to Chō converter for the reverse direction.
Step-by-step: convert chōs to dunams
- Write down the value in chōs (chō).
- Multiply that value by the factor 7.4131858275.
- The product is the equivalent value in dunams (dunam).
- To reverse, multiply the dunam (ottoman) value by 0.1348947704.
Worked examples
Example 1 — Convert 1 chō to dunam:
1 × 7.4131858275 = 7.4131858275 dunam
Example 2 — Convert 100 chō to dunam:
100 × 7.4131858275 = 741.3185827478 dunam
Real-world example — Maritime exclusion zone
A 200-chō exclusion zone (a common maritime boundary) converts to a different value in dunams that's useful when describing the same zone in everyday land-distance units.
200 chō × 7.4131858275 = 1482.6371654956 dunam
Real-world example — Coastal cruise distances
A 10-chō coastal sailing route converts to a different value in dunams — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 chō × 7.4131858275 = 74.1318582748 dunam
Real-world example — Road-sign distances across systems
A 100-chō road sign converts cleanly into dunams — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 chō × 7.4131858275 = 741.3185827478 dunam
Chō to Dunam (Ottoman) conversion table
Standard reference values for converting chōs to dunams:
| Chō [chō] | Dunam (Ottoman) [dunam] |
|---|---|
| 0.01 | 0.0741318583 |
| 0.1 | 0.7413185827 |
| 1 | 7.4131858275 |
| 2 | 14.826371655 |
| 3 | 22.2395574824 |
| 4 | 29.6527433099 |
| 5 | 37.0659291374 |
| 10 | 74.1318582748 |
| 20 | 148.2637165496 |
| 30 | 222.3955748243 |
| 40 | 296.5274330991 |
| 50 | 370.6592913739 |
| 100 | 741.3185827478 |
| 500 | 3706.592913739 |
| 1000 | 7413.1858274779 |
Frequently asked questions
How many dunams is 1 chō?
How do I convert chōs to dunams?
How do I convert dunams back to chōs?
How many dunams 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 = 7.4131858275 dunam) 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.