Work out how many switch ports fit in a rack, the density per rack unit and the free U remaining.
Rack capacity is a simple division once reservations are removed, but the useful output is density: a 1U 48-port switch gives 48 ports per U while a 4U chassis with 96 ports gives only 24. Density decides how many racks a build needs, and rack count drives floor space, power distribution and cooling — the expensive parts of a data centre.
Rack Port Density
switches that fit = floor((rack U − reserved U) ÷ switch U); ports = switches × ports per switch; density = ports ÷ U consumed.
switches that fit = floor((rack U − reserved U) ÷ switch U); ports = switches × ports per switch; density = ports ÷ U consumed. Rack capacity is a simple division once reservations are removed, but the useful output is density: a 1U 48-port switch gives 48 ports per U while a 4U chassis with 96 ports gives only 24.
Density decides how many racks a build needs, and rack count drives floor space, power distribution and cooling — the expensive parts of a data centre.
This calculator takes 5 inputs: Rack height, U reserved for PDUs, patching and servers, Height of one switch, Ports per switch, Switches planned in this rack. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.