Cooling Requirement Calculator

Convert an IT load into heat rejection, cooling tonnage, airflow CFM and direct-liquid-cooling loop sizing.

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Direct liquid cooling share: 0%
Racks above ~20 kW generally need rear-door HX or DLC; HGX B300-class racks are typically 70–100% liquid.
Air-cooled portion100 kW
Liquid-cooled portion0 kW
Heat rejection
341k BTU/hr
341,200 BTU/hr total
Cooling capacity
28.4 tons
Tons of refrigeration (3.517 kW/ton)
Airflow
15,800 CFM
For the 100 kW air-cooled share @ 20°F ΔT
CRAH units
2
30-ton units incl. one redundant
Liquid loop flow
0 GPM
For 0 kW DLC @ 15°F ΔT · 0× CDU
Water usage (evap.)
3,013 L/day
If using evaporative heat rejection — dry coolers avoid this
Rules of thumb
  • Air cooling tops out around 20 kW/rack; rear-door heat exchangers reach ~40 kW.
  • Direct liquid cooling handles 80–130+ kW/rack (HGX B300 / GB200-class deployments).
  • Every kW of IT power is a kW of heat — cooling capacity must match facility load, not just IT load.
  • Design liquid loops for 15–20°F ΔT; higher ΔT lowers flow rate and pump energy.
Power Calculator for this load →Size the cluster behind it →

Figures are planning estimates from public vendor specifications — validate final designs with your facility engineer. Need help specifying hardware? Talk to GPU Vendors or request a quote.

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