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).Click to see full answer. In respect to this, what is the standard rack size?A standard 19-inch server rack cabinet is typically 42u in height, 19 inches (482.60 mm) wide, and 36 inches (914.40 mm) deep. Newer server rack cabinets come with adjustable mounting rails allowing the user to place the rails at a shorter depth if needed.Furthermore, how tall is a 24u rack? Rack Unit Calculator (leasing rack space in cabinets) Rack Units Height (in) Height (cm) 24U 42″ 106.7 cm 25U 43.75″ 111.1 cm 26U 45.5″ 115.6 cm 27U 47.25″ 120 cm Then, what is the size of 2u rack? To be precise, 1U equals 1.75-inches (44.45mm) of rack height. Therefore, a 2U rack mount height would be 2 x 1.75”, which equals 3.5-inches high. A 3U height would be 3 x 1.75” = 5.25-inches.How many U is a standard 19 inch rack?A U space (sometimes called a Rack Unit or RU) is a means of measurement for IT equipment. One single U space is equivalent to 1.75 inches. Hole spacing for a standard 19” rack is cut in groups of three holes, this three-hole group is defined as a one U space.