Below is a chart to figure out how many inches is 1U in a Rack. This comes in handy when you need to measure out cable lengths.
1U = 1.75″
|
Rack Units
|
Height (in)
|
Height (ft)
|
Height (cm)
|
|
1U
|
1.75″
|
0.15′
|
4.4 cm
|
|
2U
|
3.5″
|
0.29′
|
8.9 cm
|
|
3U
|
5.25″
|
0.44′
|
13.3 cm
|
|
4U
|
7″
|
0.58′
|
17.8 cm
|
|
5U
|
8.75″
|
0.73′
|
22.2 cm
|
|
6U
|
10.5″
|
0.88′
|
26.7 cm
|
|
7U
|
12.25″
|
1.02′
|
31.1 cm
|
|
8U
|
14″
|
1.17′
|
35.6 cm
|
|
9U
|
15.75″
|
1.31′
|
40 cm
|
|
10U
|
17.5″
|
1.46′
|
44.5 cm
|
|
11U
|
19.25″
|
1.6′
|
48.9 cm
|
|
12U
|
21″
|
1.75′
|
53.3 cm
|
|
13U
|
22.75″
|
1.9′
|
57.8 cm
|
|
14U
|
24.5″
|
2.04′
|
62.2 cm
|
|
15U
|
26.25″
|
2.19′
|
66.7 cm
|
|
16U
|
28″
|
2.33′
|
71.1 cm
|
|
17U
|
29.75″
|
2.48′
|
75.6 cm
|
|
18U
|
31.5″
|
2.63′
|
80 cm
|
|
19U
|
33.25″
|
2.77′
|
84.5 cm
|
|
20U
|
35″
|
2.92′
|
88.9 cm
|
|
21U
|
36.75″
|
3.06′
|
93.3 cm
|
|
22U
|
38.5″
|
3.21′
|
97.8 cm
|
|
23U
|
40.25″
|
3.35′
|
102.2 cm
|
|
24U
|
42″
|
3.5′
|
106.7 cm
|
|
25U
|
43.75″
|
3.65′
|
111.1 cm
|
|
26U
|
45.5″
|
3.79′
|
115.6 cm
|
|
27U
|
47.25″
|
3.94′
|
120 cm
|
|
28U
|
49″
|
4.08′
|
124.5 cm
|
|
29U
|
50.75″
|
4.23′
|
128.9 cm
|
|
30U
|
52.5″
|
4.38′
|
133.4 cm
|
|
31U
|
54.25″
|
4.52′
|
137.8 cm
|
|
32U
|
56″
|
4.67′
|
142.2 cm
|
|
33U
|
57.75″
|
4.81′
|
146.7 cm
|
|
34U
|
59.5″
|
4.96′
|
151.1 cm
|
|
35U
|
61.25″
|
5.1′
|
155.6 cm
|
|
36U
|
63″
|
5.25′
|
160 cm
|
|
37U
|
64.75″
|
5.4′
|
164.5 cm
|
|
38U
|
66.5″
|
5.54′
|
168.9 cm
|
|
39U
|
68.25″
|
5.69′
|
173.4 cm
|
|
40U
|
70″
|
5.83′
|
177.8 cm
|
|
41U
|
71.75″
|
5.98′
|
182.2 cm
|
|
42U
|
73.5″
|
6.13′
|
186.7 cm
|
|
43U
|
75.25″
|
6.27′
|
191.1 cm
|
|
44U
|
77″
|
6.42′
|
195.6 cm
|
|
45U
|
78.75″
|
6.56′
|
200 cm
|
|
46U
|
80.5″
|
6.71′
|
204.5 cm
|
|
47U
|
82.25″
|
6.85′
|
208.9 cm
|
|
48U
|
84″
|
7′
|
213.4 cm
|