Theater Calculators
Power Conditioner Sizing (VA/Watts) Calculator
https://www.theatersizing.com/calculators/power-conditioner-sizing/
Estimate only — not a calibrated SPL meter, an acoustic report or an electrical design. Confirm with measurement.
Power Conditioner Sizing (VA/Watts) Calculator
Add the nameplate watts (or honest measurements) and keep 25% free so a laser projector lamp-up does not sag the AVR.
Inputs
Results
Please tick the box above to display the Result.
Calculation method
VA ≈ 1.25 × Σ watts. Headroom watts = 0.25 × Σ.
Exact formula
VA = 1.25 ΣP. Limits: assumes ~unity power factor, no inrush, no 240 V split from 120 V math.
Frequently asked questions
Watts or VA?
VA = watts ÷ power factor. Gear with active PFC sits near 1, but linear-supply AVRs and amps can sit near 0.6–0.7, so their VA runs well above their watts. The 1.25 factor only covers a power factor of 0.8; when the nameplate prints volts × amps, use that.
Include the sub?
Yes. Count its draw at volume, not standby: a 300 W plate amp can pull far more than 30 W on big effects.
Laser projector idle?
Use the bright-lamp number, not eco idle.
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