Convert Dunam (Ottoman) to Hectare
Convert dunams to hectares instantly. 1 dunam (ottoman) = 0.13378 hectare — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Hectare to Dunam (Ottoman) converter for the reverse conversion.
Units explained
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Traditional Ottoman unit; largely superseded by metric dunam.
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.
Dunam (Ottoman) to Hectare conversion formula
The relationship between dunams and hectares:
To convert dunams to hectares, multiply the value in dunams by 0.13378. To reverse, multiply hectares by 7.4749588877.
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 Dunam (Ottoman) converter for the reverse direction.
Step-by-step: convert dunams to hectares
- Write down the value in dunams (dunam).
- Multiply that value by the factor 0.13378.
- The product is the equivalent value in hectares (ha).
- To reverse, multiply the hectare value by 7.4749588877.
Worked examples
Example 1 — Convert 1 dunam to ha:
1 × 0.13378 = 0.13378 ha
Example 2 — Convert 100 dunam to ha:
100 × 0.13378 = 13.378 ha
Real-world example — Endurance race distances
A 50-dunam (ottoman) cycling or running race converts to a recognizable distance in hectares. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 dunam × 0.13378 = 6.689 ha
Real-world example — Maritime exclusion zone
A 200-dunam (ottoman) 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 dunam × 0.13378 = 26.756 ha
Real-world example — Coastal cruise distances
A 10-dunam (ottoman) 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 dunam × 0.13378 = 1.3378 ha
Dunam (Ottoman) to Hectare conversion table
Standard reference values for converting dunams to hectares:
| Dunam (Ottoman) [dunam] | Hectare [ha] |
|---|---|
| 0.01 | 0.0013378 |
| 0.1 | 0.013378 |
| 1 | 0.13378 |
| 2 | 0.26756 |
| 3 | 0.40134 |
| 4 | 0.53512 |
| 5 | 0.6689 |
| 10 | 1.3378 |
| 20 | 2.6756 |
| 30 | 4.0134 |
| 40 | 5.3512 |
| 50 | 6.689 |
| 100 | 13.378 |
| 500 | 66.89 |
| 1000 | 133.78 |
Frequently asked questions
How many hectares is 1 dunam (ottoman)?
How do I convert dunams to hectares?
How do I convert hectares back to dunams?
How many hectares is 100 dunams?
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 dunam = 0.13378 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 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.