Khet to Millimeters (khet to mm)

1 khet equals 52,500 millimeters exactly.

1 khet = 52,500 millimeters

How to convert khet to millimeters

To convert khet to millimeters, multiply the number of khet by 52,500. This factor is exact. To go the other way, multiply millimeters by 0.00001904761905 (rounded).

millimeters = khet × 52,500

Example: 10 khet = 525,000 millimeters.

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

About these units

Khet (khet)

Ancient EgyptianHistorical unit (no longer in standard use)Approximate value

One hundred royal cubits, about 52.5 m. A land-surveying measure laid out with a knotted cord.

Land in Egypt had to be measured again and again, because the annual Nile flood erased boundaries, and the khet belonged to that work. It is usually explained as a length of 100 royal cubits, measured with a cord or rope marked by knots at regular intervals, a technique shown in tomb scenes such as that of Menna at Thebes. With a cubit of 52.5 cm, one khet comes to about 52.5 m, though cubit rods vary, so the true length could be a metre or so either way.

Usage is not entirely uniform. Wikipedia's article on Egyptian units lists the 100-cubit cord under a different name and gives khet as another label for a short rod of about 60 cm, so the term is read in more than one way by modern authors. In area work the khet is the side of a square, and one square khet is the setat, about 2,760 square metres at this size. The khet is about 52 m, or roughly 57 yards.

1 khet = 52.5 meters (approximately).

Sources: Wikipedia: Ancient Egyptian units of measurement; Wikipedia: Cubit

Millimeter (mm)

Metric (SI)Current unit

One thousandth of a meter. Used in engineering, manufacturing and rainfall measurement.

Carl Friedrich Gauss put the millimeter at the base of his 1832 proposal for absolute units, pairing it with the milligram and the second, although the centimeter-based CGS system later won out among scientists. The name combines the metric prefix milli-, from the Latin for one thousand, with the meter. Since 1983 a millimeter has been tied to the speed of light: it is the distance light covers in 1/299,792,458,000 of a second.

Millimeters are the language of fine mechanical work. Standard rulers are divided into them, digital calipers commonly read to 0.01 mm, and mechanical pencil leads come in 0.5 and 0.7 mm. Copy paper is about 0.1 mm thick, and a thin hair, at 0.02 to 0.04 mm across, is close to the smallest thing the naked eye can see. A wave with a frequency of 300 GHz has a wavelength of 1 mm. An inch is exactly 25.4 mm. One trap for readers in the United States is that mil there traditionally means a thousandth of an inch, not a millimeter.

1 millimeter = 0.001 meters (exactly).

Sources: Wikipedia: Millimetre; Wikipedia: Centimetre-gram-second system of units; NIST Guide to the SI, Appendix B.8: conversion factors

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