U Conversion Chart

What is a “U” or “Rack Unit”?
The “U”, “RU” or “Rack Unit”, was created by the Electronic Industries Association (EIA). The EIA standard was created for cabinets, racks and panels, as well as other associated equipment.

It sets a standard for system spacing, mounting, bezel clearance, as well as placement of the mounting holes in the mounting flange. One rack unit is 1.75 inches. To quickly convert rack units into inches use our rack unit conversion calculator or click Here for a PDF U Conversion Chart.

 

Rack Unit	Inches
49U	85.75″
46U	80.50″
45U	78.75″
44U	77.00″
43U	75.25″
42U	73.50″
41U	71.75″
40U	70.00″
39U	68.25″
38U	66.50″
37U	64.75″
36U	63.00″
35U	61.25″
34U	59.50″
33U	57.75″
32U	56.00″
31U	54.25″
30U	52.50″
29U	50.75″
28U	49.00″
27U	47.25″
26U	45.50″
25U	43.75″
24U	42.00″
23U	40.25″
22U	38.50″
21U	36.75″
20U	35.00″
19U	33.25″
18U	31.50″
17U	29.75″
16U	28.00″
15U	26.25″
14U	24.50″
13U	22.75″
12U	21.00″
11U	19.25″
10U	17.50″
9U	15.75″
8U	14.00″
7U	12.25″
6U	10.50″
5U	8.75″
4U	7.00″
3U	5.25″
2U	3.50″
1U	1.75″