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
- Total draw
- 590W
- VA with 25% headroom
- 738VA
- Headroom
- 148W
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?
For AV gear near unity PF they are close. UPS charts are in VA — use the headroom figure.
Include the sub?
Yes. A 300 W plate amp is not a 30 W nameplate.
Laser projector idle?
Use the bright-lamp number, not eco idle.
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