calc.engineer / Homelab & Networking / Rack Capacity

Rack Capacity v1.0.0

Quick rack space and weight sizing calculator for homelab and small data center racks. Enter your devices with their height in rack units, weight, and wattage to get total utilization, remaining free space, weight totals in lbs and kg, and recommended PDU count based on the NEC 80% continuous load rule (1920W per 20A/120V PDU). Estimates cable management overhead at 2U per 10U of installed gear. Outputs total_watts that chains into power_cost and cooling_btu for full infrastructure planning.

feeds power_cost →feeds cooling_btu →
Total rack height in rack units (standard is 42U)
List of devices to place in the rack
Fill in the inputs and Compute to see the structured result.

From an agent (MCP) or the API

curl -X POST https://calc.engineer/api/rack_capacity \
  -H "Content-Type: application/json" \
  -d '{"rack_units": …, "devices": …}'

MCP: connect to https://calc.engineer/mcp and call rack_capacity.

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