Convert Hectare to Dunam (Ottoman)
Convert hectares to dunams instantly. 1 hectare = 7.4749588877 dunam (ottoman) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dunam (Ottoman) to Hectare converter for the reverse conversion.
Units explained
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)
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Traditional Ottoman unit; largely superseded by metric dunam.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 to Dunam (Ottoman) conversion formula
The relationship between hectares and dunams:
To convert hectares to dunams, multiply the value in hectares by 7.4749588877. To reverse, multiply dunams by 0.13378.
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 Hectare converter for the reverse direction.
Step-by-step: convert hectares to dunams
- Write down the value in hectares (ha).
- Multiply that value by the factor 7.4749588877.
- The product is the equivalent value in dunams (dunam).
- To reverse, multiply the dunam (ottoman) value by 0.13378.
Worked examples
Example 1 — Convert 1 ha to dunam:
1 × 7.4749588877 = 7.4749588877 dunam
Example 2 — Convert 100 ha to dunam:
100 × 7.4749588877 = 747.4958887726 dunam
Real-world example — Maritime exclusion zone
A 200-hectare 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 ha × 7.4749588877 = 1494.9917775452 dunam
Real-world example — Coastal cruise distances
A 10-hectare 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 ha × 7.4749588877 = 74.7495888773 dunam
Real-world example — Road-sign distances across systems
A 100-hectare 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 ha × 7.4749588877 = 747.4958887726 dunam
Hectare to Dunam (Ottoman) conversion table
Standard reference values for converting hectares to dunams:
| Hectare [ha] | Dunam (Ottoman) [dunam] |
|---|---|
| 0.01 | 0.0747495889 |
| 0.1 | 0.7474958888 |
| 1 | 7.4749588877 |
| 2 | 14.9499177755 |
| 3 | 22.4248766632 |
| 4 | 29.8998355509 |
| 5 | 37.3747944386 |
| 10 | 74.7495888773 |
| 20 | 149.4991777545 |
| 30 | 224.2487666318 |
| 40 | 298.998355509 |
| 50 | 373.7479443863 |
| 100 | 747.4958887726 |
| 500 | 3737.4794438631 |
| 1000 | 7474.9588877261 |
Frequently asked questions
How many dunams is 1 hectare?
How do I convert hectares to dunams?
How do I convert dunams back to hectares?
How many dunams is 100 hectares?
Popular area unit conversions
Convert Hectare to other area units
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Metric / SI (15 units)
Imperial / US Customary (15 units)
US Survey (5 units)
Indian Subcontinent (16 units)
Other Regional (10 units)
Scientific / Physics (5 units)
Historical / Pre-metric European (6 units)
Sources & references
Conversion factor (1 ha = 7.4749588877 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.