How do you calculate rack units?

A “Rack Unit” is equal to 1.75″ in height. To calculate the internal useable space of a rack enclosure you would simply multiply the total amount of Rack Units by 1.75″. For example, a 44U rack enclosure would have 77″ of internal usable space (44 x 1.75).

What is 1U in a rack?

1.75 inches
One U is 1.75 inches (44.45mm); the standard rack, at 19 inches, is 42U. Rack servers and other hardware designed to be rack-mounted are manufactured in multiples of 1.75 inches and specified in multiples of rack units, usually 1U, 2U, 3U or 4U. Racks are designed to hold equipment of those sizes.

How many rack units in a standard rack?

The height of a rack can vary from a few inches, such as in a broadcast console, to a floor mounted rack whose interior is 45 rack units (200.2 centimetres or 78.82 inches) high. 42U is a common configuration. Many wall-mounted enclosures for industrial equipment use 19-inch racks.

How many U are in a 7ft rack?

48U
the “U” in “42U” is stands for “rack units,” or “U-spaces,” which equal 1.75 inches. If you are investing in data center racks, the standard height is 48U (“7-foot rack”) or, on some occasions, 42U.

What is the size of a rack unit?

A rack unit (abbreviated as U, less commonly seen as RU) is a unit of measurement applied to equipment racks and the servers, disk drives and other devices that they contain. One U is 1.75 inches (44.45mm); the standard rack, at 19 inches, is 42U.

When was the 19 inch rack unit invented?

The 19-inch rack format with rack-units of 1.75 inches (44.45 mm) was established as a standard by AT around 1922 in order to reduce the space required for repeater and termination equipment in a telephone company central office. Configurations

How tall is a 1U rackmount computer panel?

Thus, a 1U rackmount computer is not 1.75 inches (44.45 mm) tall but is 1.71875 inches (43.66 mm) tall. If n is number of rack units, the ideal formula for panel height is h = (1.75 n − 0.031) for calculating in inches, and h = (44.45 n − 0.794) for calculating in millimetres.

How tall is a rack panel in inches?

Definition. While a rack unit is defined as 44.50 millimetres (1.752 in), a front panel or filler panel in a rack is not an exact multiple of this height. To allow space between adjacent rack-mounted components, a panel is ​ 1⁄32 inch (0.03125 in or 0.794 mm) less in height than the full number of rack units would imply.