Convert Dunam (Ottoman) to Acre
Convert dunams to acres instantly. 1 dunam (ottoman) = 0.3305775793 acre — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Acre 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Traditional Ottoman unit; largely superseded by metric dunam.
Acre
An acre is an imperial unit of area equal to exactly 4046.8564224 m². It is the most widely used non-metric unit for land area, particularly in the US, UK, and India.
Originally defined in medieval England as the area one yoke of oxen could plow in a day, approximately 40 perches by 4 perches. Standardized via the 1959 International Yard and Pound Agreement.
Acres are the standard land measurement unit in the US (real estate, agriculture), the UK (rural property), and widely used in India (alongside hectares and traditional regional units). 1 acre = 4840 sq yd = 43,560 sq ft = 0.4047 hectare.
Medieval English farming origin; modern exact value standardized in 1959.
Dunam (Ottoman) to Acre conversion formula
The relationship between dunams and acres:
To convert dunams to acres, multiply the value in dunams by 0.3305775793. To reverse, multiply acres by 3.0250085382.
How to use this converter
Type a value into the calculator. The result in acres updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Acre to Dunam (Ottoman) converter for the reverse direction.
Step-by-step: convert dunams to acres
- Write down the value in dunams (dunam).
- Multiply that value by the factor 0.3305775793.
- The product is the equivalent value in acres (ac).
- To reverse, multiply the acre value by 3.0250085382.
Worked examples
Example 1 — Convert 1 dunam to ac:
1 × 0.3305775793 = 0.3305775793 ac
Example 2 — Convert 100 dunam to ac:
100 × 0.3305775793 = 33.0577579327 ac
Real-world example — Maritime exclusion zone
A 200-dunam (ottoman) exclusion zone (a common maritime boundary) converts to a different value in acres that's useful when describing the same zone in everyday land-distance units.
200 dunam × 0.3305775793 = 66.1155158654 ac
Real-world example — Coastal cruise distances
A 10-dunam (ottoman) coastal sailing route converts to a different value in acres — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 dunam × 0.3305775793 = 3.3057757933 ac
Real-world example — Road-sign distances across systems
A 100-dunam (ottoman) road sign converts cleanly into acres — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 dunam × 0.3305775793 = 33.0577579327 ac
Dunam (Ottoman) to Acre conversion table
Standard reference values for converting dunams to acres:
| Dunam (Ottoman) [dunam] | Acre [ac] |
|---|---|
| 0.01 | 0.0033057758 |
| 0.1 | 0.0330577579 |
| 1 | 0.3305775793 |
| 2 | 0.6611551587 |
| 3 | 0.991732738 |
| 4 | 1.3223103173 |
| 5 | 1.6528878966 |
| 10 | 3.3057757933 |
| 20 | 6.6115515865 |
| 30 | 9.9173273798 |
| 40 | 13.2231031731 |
| 50 | 16.5288789663 |
| 100 | 33.0577579327 |
| 500 | 165.2887896634 |
| 1000 | 330.5775793268 |
Frequently asked questions
How many acres is 1 dunam (ottoman)?
How do I convert dunams to acres?
How do I convert acres back to dunams?
How many acres is 100 dunams?
Popular area unit conversions
Convert Dunam (Ottoman) to other area units
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Metric / SI (5 units)
Imperial / US Customary (3 units)
Other Regional (9 units)
Sources & references
Conversion factor (1 dunam = 0.3305775793 ac) 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.