Convert Ardeb to millilitres

A volume for grain, still official

The Egyptian ardeb is standardised at approximately 198 litres, divided into six waybah or twelve kaylah. It descends from the Arabic irdabb, itself derived from a Persian measure, and it has been the working grain unit of the Nile valley for centuries.

Unlike most traditional measures, the ardeb never became purely historical: Egypt's Ministry of Supply and its agricultural statistics still use it, and government wheat procurement prices are announced per ardeb.

Volume in, mass out

Because the ardeb is a volume, its mass equivalent depends entirely on the commodity. An ardeb of wheat is conventionally about 150 kg, of maize about 140 kg, of barley about 120 kg and of cotton seed about 120 kg. These are trade conventions rather than measurements, and they are what turn Egyptian production figures into tonnes.

This is the single most important thing to know about the unit: converting "one million ardebs" of an unspecified crop into tonnes is not possible. The commodity must be named, and the conventional bushel weight for that commodity applied.

Regional and historical variation

Older Egyptian sources record ardebs of different sizes, and the unit spread across the wider Arab world with local values — Sudanese and Levantine usage does not match the Egyptian figure. Ottoman-era records in particular use a different measure under a cognate name.

The associated land unit is the feddan (4,200.83 m²), and yields are reported as ardebs per feddan. Converting an Egyptian yield to tonnes per hectare therefore requires three factors: ardeb-to-kilogram for the crop, feddan-to-hectare, and the arithmetic that joins them.

Converting Egyptian agricultural data

Always convert in the order volume → commodity mass → metric, stating the conventional weight used. A converted figure without its assumed density is not reproducible and cannot be checked against FAO or USDA series.

For procurement and contract work, use the figure stated in the contract or in the Ministry of Supply announcement rather than a general reference value. Egyptian wheat procurement in particular has used specific conversion figures that differ slightly from the general trade convention.

Statistics and the sack

Egyptian agricultural statistics report wheat, maize and rice in ardebs, so the unit is unavoidable when working with Ministry of Agriculture series or historical cotton-and-grain trade data. As a volume of about 198 litres it converts to mass only once the commodity is known: an ardeb of wheat is conventionally around 150 kilograms, of maize around 140.

The ardeb also varied by commodity and period in a way that modern tables flatten. Nineteenth-century trade records from Alexandria use port-specific values, and the sub-units — the keila and the roub — are fractions of the ardeb in use at the time rather than of the modern figure. Any conversion of an archival series should be done source by source, with the assumed value stated.

In current Egyptian usage the ardeb is being displaced by the metric ton in official reporting while remaining standard in farmgate trade, so recent statistics may mix both. Where a series changes units mid-way, the break is usually visible as an implausible step in the year-on-year figures rather than as an explicit note.

Common mistakes to avoid

• The ardeb is a volume: its mass depends on the crop (wheat about 150 kg, maize about 140 kg, barley about 120 kg).
• Sudanese, Levantine and Ottoman-era measures with cognate names are not the Egyptian 198-litre ardeb.
• Yields in ardebs per feddan need both a crop-specific mass factor and the feddan-to-hectare conversion (1 feddan = 0.42008 ha).

Questions people ask about the Ardeb

How many litres is one ardeb?

About 198 litres in the Egyptian standard, divided into six waybah or twelve kaylah.

How many kilograms of wheat are in an ardeb?

Conventionally about 150 kg. Maize is about 140 kg and barley about 120 kg, because the ardeb measures volume rather than mass.

Is the ardeb still used in Egypt?

Yes. Egyptian grain trade, government procurement pricing and agricultural statistics all use the ardeb alongside metric units.