Cubits to Kilometers (cbt to km)

1 cubit equals 0.0004572 kilometers exactly.

1 cubit = 0.0004572 kilometers

How to convert cubits to kilometers

To convert cubits to kilometers, multiply the number of cubits by 0.0004572. This factor is exact. To go the other way, multiply kilometers by 2,187.226597 (rounded).

kilometers = cubits × 0.0004572

Example: 10 cubits = 0.004572 kilometers.

Approximate value. Standards for the cubit varied by place and period, so this converter uses the most commonly cited value. Treat results as estimates, not exact figures.

About these units

Cubit (cbt)

Medieval EnglishHistorical unit (no longer in standard use)Approximate value

Traditionally the length from the elbow to the tip of the middle finger. The common English cubit is taken as 18 inches (45.72 cm); ancient cubits ranged from about 44 to 53 cm.

From the Latin cubitum, meaning elbow, the cubit was the forearm measured from the elbow to the fingertips. English use tied it to roughly 18 inches, or 45.72 cm. Such a hand-and-arm measure is the same idea that produced the ell, which Wikipedia describes as originally a cubit.

No single value ever governed it. Wikipedia lists most ancient cubits between 44.4 and 52.92 cm, from the Roman cubitus of about 444 mm, which Vitruvius set at one and a half Roman feet, to the Egyptian royal cubit near 523 to 529 mm. Medieval Islamic cubits ranged far wider still.

The English ell eventually settled at 45 inches, one and a quarter yards, while the cubit faded from commerce. A trace survives in hedgelaying, where a forearm of about 18 inches sets the spacing of stakes. The figure used here is the 18 inch English cubit.

1 cubit = 0.4572 meters (approximately).

Sources: Wikipedia: Cubit; Wikipedia: Ell

Kilometer (km)

Metric (SI)Current unit

1,000 meters. The standard unit for road distances in most countries.

A name for 1,000 meters took a while to settle. In 1793 France's National Convention made the metre the sole French unit of length, and the first proposed name for the thousand-metre multiple was millaire. Everyday French usage then leaned on the myriametre, 10,000 meters, well into the 1800s. The Netherlands adopted the kilometre in 1817, under the local name mijl, and made it the only official unit of that size in 1867. In 1935 the CIPM dropped the myria- prefix, which left the kilometre as the standard unit for road-scale distances.

Kilo- is the SI prefix for a thousand, and the kilometre is now the preferred unit for land distances in most of the world, with the United States, the United Kingdom and Liberia among those that still use the mile. One kilometre is about 0.621 mile. The main span of Lisbon's 25 de Abril Bridge, at 1.013 km, gives a sense of the scale. Even its pronunciation has been argued over: in 1970 Australia's Metric Conversion Board made stress on the first syllable official, although Prime Minister Gough Whitlam argued for stress on the second. Military slang in several countries calls it a klick.

1 kilometer = 1,000 meters (exactly).

Sources: Wikipedia: Kilometre; Wikipedia: Metric prefix; BIPM: history of the metre

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