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Server Rack Size Guide
The table below can be used to determine the height of a server rack or cabinet in metric and imperial measurements. This is the internal ‘usable’ height within a server rack and the overall height of the rack will depend on the feet attached which may be adjustable feet or castors and the cable entry points.
The table can also be used to calculate the total ‘U’ height of the equipment to be located in the rack or cabinet and how much space capacity is available for future expansion. For example total the height in millimetres (mm) and divide by 44.45 to get the approximate U height.
| U Height | Metres | Centimetres | Millimetres | Feet | Inches |
|---|---|---|---|---|---|
| 1U | 0.04m | 4.45cm | 44.45mm | 0.15ft | 1.75" |
| 2U | 0.09m | 8.89cm | 88.90mm | 0.29ft | 3.50" |
| 3U | 0.13m | 13.34cm | 133.35mm | 0.44ft | 5.25" |
| 4U | 0.18m | 17.78cm | 177.80mm | 0.58ft | 7.00" |
| 5U | 0.22m | 22.23cm | 222.25mm | 0.73ft | 8.75" |
| 6U | 0.27m | 26.67cm | 266.70mm | 0.88ft | 10.50" |
| 7U | 0.31m | 31.12cm | 311.15mm | 1.02ft | 12.25" |
| 8U | 0.36m | 35.56cm | 355.60mm | 1.17ft | 14.00" |
| 9U | 0.40m | 40.01cm | 400.05mm | 1.31ft | 15.75" |
| 10U | 0.44m | 44.45cm | 444.50mm | 1.46ft | 17.50" |
| 11U | 0.49m | 48.90cm | 488.95mm | 1.60ft | 19.25" |
| 12U | 0.53m | 53.34cm | 533.40mm | 1.75ft | 21.00" |
| 13U | 0.58m | 57.79cm | 577.85mm | 1.90ft | 22.75" |
| 14U | 0.62m | 62.23cm | 622.30mm | 2.04ft | 24.50" |
| 15U | 0.67m | 66.68cm | 666.75mm | 2.19ft | 26.25" |
| 16U | 0.71m | 71.12cm | 711.20mm | 2.33ft | 28.00" |
| 17U | 0.76m | 75.57cm | 755.65mm | 2.48ft | 29.75" |
| 18U | 0.80m | 80.01cm | 800.10mm | 2.63ft | 31.50" |
| 19U | 0.84m | 84.46cm | 844.55mm | 2.77ft | 33.25" |
| 20U | 0.89m | 88.90cm | 889.00mm | 2.92ft | 35.00" |
| 21U | 0.93m | 93.35cm | 933.45mm | 3.06ft | 36.75" |
| 22U | 0.98m | 97.79cm | 977.90mm | 3.21ft | 38.50" |
| 23U | 1.02m | 102.24cm | 1022.35mm | 3.35ft | 40.25" |
| 24U | 1.07m | 106.68cm | 1066.80mm | 3.50ft | 42.00" |
| 25U | 1.11m | 111.13cm | 1111.25mm | 3.65ft | 43.75" |
| 26U | 1.16m | 115.57cm | 1155.70mm | 3.79ft | 45.50" |
| 27U | 1.20m | 120.02cm | 1200.15mm | 3.94ft | 47.25" |
| 28U | 1.24m | 124.46cm | 1244.60mm | 4.08ft | 49.00" |
| 29U | 1.29m | 128.91cm | 1289.05mm | 4.23ft | 50.75" |
| 30U | 1.33m | 133.35cm | 1333.50mm | 4.38ft | 52.50" |
| 31U | 1.38m | 137.80cm | 1377.95mm | 4.52ft | 54.25" |
| 32U | 1.42m | 142.24cm | 1422.40mm | 4.67ft | 56.00" |
| 33U | 1.47m | 146.69cm | 1466.85mm | 4.81ft | 57.75" |
| 34U | 1.51m | 151.13cm | 1511.30mm | 4.96ft | 59.50" |
| 35U | 1.56m | 155.58cm | 1555.75mm | 5.10ft | 61.25" |
| 36U | 1.60m | 160.02cm | 1600.20mm | 5.25ft | 63.00" |
| 37U | 1.64m | 164.47cm | 1644.65mm | 5.40ft | 64.75" |
| 38U | 1.69m | 168.91cm | 1689.10mm | 5.54ft | 66.50" |
| 39U | 1.73m | 173.36cm | 1733.55mm | 5.69ft | 68.25" |
| 40U | 1.78m | 177.80cm | 1778.00mm | 5.83ft | 70.00" |
| 41U | 1.82m | 182.25cm | 1822.45mm | 5.98ft | 71.75" |
| 42U | 1.87m | 186.69cm | 1866.90mm | 6.13ft | 73.50" |
| 43U | 1.91m | 191.14cm | 1911.35mm | 6.27ft | 75.25" |
| 44U | 1.96m | 195.58cm | 1955.80mm | 6.42ft | 77.00" |
| 45U | 2.00m | 200.03cm | 2000.25mm | 6.56ft | 78.75" |
| 46U | 2.04m | 204.47cm | 2044.70mm | 6.71ft | 80.50" |
| 47U | 2.09m | 208.92cm | 2089.15mm | 6.85ft | 82.25" |
| 48U | 2.13m | 213.36cm | 2133.60mm | 7.00ft | 84.00" |
Please contact our projects team for further information on server rack sizing.