Theater Calculators
Blackout Paint Light Reflectance Value Estimator
https://www.theatersizing.com/calculators/blackout-paint-lrv/
Estimate only — not a calibrated SPL meter, an acoustic report or an electrical design. Confirm with measurement.
Blackout Paint Light Reflectance Value Estimator
Low LRV paint drinks projector spill. Each extra bounce multiplies by ~0.7 in this toy model. Contrast gain is 50 / remaining percent.
Inputs
Results
- Remaining bounce
- 3.5%
- Crude contrast factor
- 14.3
Calculation method
Remaining % ≈ LRV × 0.7^(bounces−1). Contrast gain ≈ 50 / remaining.
Exact formula
R = LRV · 0.7^(n-1). Limits: uniform walls, no ceiling/floor split, no ALR screen, not a lighting design.
Frequently asked questions
What is LRV?
Light Reflectance Value, 0–100. Theater blacks are very low.
Ceiling too?
Yes — it is often the brightest bounce into the screen.
Matte or gloss?
Matte. Gloss dumps a specular hot spot.
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