Theater Calculators
AV Rack U-Space Calculator
https://www.theatersizing.com/calculators/av-rack-u-space/
Estimate only — not a calibrated SPL meter, an acoustic report or an electrical design. Confirm with measurement.
AV Rack U-Space Calculator
1U is 44.45 mm. Leave empty U as chimneys. A 9.4-ch AVR is often 4U plus a 1U gap.
Inputs
Results
- Gear U
- 8
- Vent U
- 3
- Cabinet U to buy
- 11
Calculation method
Used U = sum of gear. Vent U = 3 × vent-each (above AVR, disc, switch). Rack = ceil(used + vent).
Exact formula
1U = 44.45 mm. Rack = ceil(ΣU + 3 v). Limits: no depth, no weight, no IEC inlet count.
Frequently asked questions
Is a 2U AVR really 2U?
Check the manual. Handles and feet can steal another U in a closed box.
Wheels?
A 12U on casters still needs a depth that clears IEC leads.
Wall cabinet?
Same U math. Heat is worse — add the vent U, not subtract.
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