Interactive · three inputs, live math, honest verdict

Room load calculator

Can your room host a liquid-to-air cabinet? The formula shows itself with your numbers — and the bar shows how thin the margin really is.

Cabinet IT load 30 kWRoom AC installed capacity 35 kWExisting heat in same zone 0 kW

REQUIRED — heat the room must remove

33.0 kW

AVAILABLE — AC spare capacity

35.0 kW

margin 1.06×

⚠️ Conditional — derate the cabinet or verify AC condition

Heat to reject	`1.1 × 30 = 33.0 kW`
…in refrigeration tons	`33.0 ÷ 3.517 = 9.4 tons`
AC spare capacity	`35 − 0 = 35.0 kW`
Margin	`35.0 ÷ 33.0 = 1.06×`

Try this

IT 30 kW, AC 35 kW, existing 0 → green, but the bar shows the margin is one hot afternoon wide.
Add 5 kW of existing equipment in the same zone → green turns red. Zones matter.
Keep the AC, halve the IT load → find the load this room can actually host.

Rule: margin ≥ 1.15 green · 1.0–1.15 conditional · < 1.0 insufficient. The 1.1 factor covers pumps and fans — the 1.1× rule explained · full worked guide in room load calculation.