Please note that actual internal and external height vary depending on rack manufacturer.
Server rack size calculator.
One u is 1 75 inches 44 45mm.
The vertical inches are on the facial area of the server rack chassis.
100 is considered to be at plate rating or the maximum load that it can generate.
U conversion calculator convert from u s to inches select u 1u 2u 3u 4u 5u 6u 7u 8u 9u 10u 11u 12u 13u 14u 15u 16u 17u 18u 19u 20u 21u 22u 23u 24u 25u 26u 27u 28u 29u 30u 31u 32u 33u 34u 35u 36u 37u 38u 39u 40u 41u 42u 43u 44u 45u 46u 47u 48u 49u.
That said it is possible to understand the notation used for server rack sizing.
Enter 869 racks into the calculator then leave the de rating and or production load at 100 on the slider.
Racks are designed to hold equipment of those sizes.
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.
The standard rack at 19 inches is 42u.
42u server racks are the most common rack height sold for data centers.
42u 42 rack units on your mounting rails 73 5 of rack mount space available.
This has no bearing on width or depth of devices in the chassis.
For example a 9u rack has a width of 19 inches for a standard rack and a height of 15 75 inches 1 75 multiplied by 9.