Rack Book
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Server City Rack planner

Example closet rack

Rack Book Plus $1.95 a month or $19.50 a year · Free during preview · what it buys

12U · 120 V · 20 A breaker

1 2 3 4 5 6 7 8 9 10 11 12 UPS 1500VA/1000W (2U) Server 2U (2U) NAS 4-bay (2U) Firewall Switch 24-port PoE Patch panel

What it adds up to

Rack space9U used of 12U · 3U free
Power740 W
Current6.2 A at 120 V · 31% of a 20 A breaker (80% line 16.0 A)
Heat2,525 BTU/h · 0.21 tons of cooling
Weight141 lb

Checks

OK Everything fits, nothing overlaps, the circuit is under 80% and heavier gear sits lower.

Estimates from what you entered. Use measured or label watts; check rack and rail load ratings with the maker.

Change the rack

Each device: name, then height (U), watts, weight (lb) and bottom U (blank = placed for you).

DeviceUWattslbBottom U (blank = auto)

Up to 24 devices; leave a name blank to skip a row. Save, then reopen to get more empty rows.

Saving needs a free Rack Book (no account or email).