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Technology & Systems Calculators

Utility calculators for sysadmins, DevOps, network engineers, and IT professionals. Calculate RAID storage and fault tolerance, UPS battery runtime, server rack space & power, CCTV video storage, subnet masks, and byte sizing.

Server Rack Sizing & Power

Calculate rack space (U utilization), continuous electrical draw (Amps/kW), and thermal heat dissipation (BTU/hr).

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Server Rack & Circuit Specs

Hardware Equipment Inventory

Adjust hardware counts and estimated operating watts per device:
1U Managed Switch / Router
1U height•
Draw:W
2
1U Patch Panel / Cable Mgmt
1U height•
Draw:W
2
1U Appliance / Edge Server
1U height•
Draw:W
1
2U Dual-CPU Server (Dell/HP)
2U height•
Draw:W
3
4U Storage Shelf (JBOD / SAN)
4U height•
Draw:W
1
2U Rackmount UPS
2U height•
Draw:W
2

Rack Space Utilization

Occupied Rack Units
19U / 42U

23U available for expansion

Space Used45%

Power & Cooling Requirements

Total Power1800 Watts1.80 kW continuous
Electrical Current15.0 Amps@ 120V AC
Within Normal Range
Current draw is 75% of the 20A breaker (Safe max is 16.0A).
Thermal Heat Output
6,142 BTU/hr0.51 Tons AC

HVAC cooling capacity required to neutralize server closet heat.

Rack Density Best Practices

The 80% Rule (NEC): According to the National Electrical Code, continuous loads (running 3+ hours) should never exceed 80% of a circuit breaker's rating to avoid nuisance tripping and overheated wiring.

Blanking Panels: Always install 1U blanking panels over unused slots to maintain proper front-to-back cold aisle airflow.