Acoustic Glass Rating Calculator

This calculator estimates acoustic performance for an insulating glass unit using simplified mass-law acoustics: an Estimated STC Rating, an Estimated OITC Rating (typically 5 to 10 points lower than STC, since OITC weights the low-frequency traffic and aircraft noise that STC largely ignores), a Noise Reduction figure, and the raw Mass Law TL at whatever Test Frequency is chosen. Test Frequency only feeds Mass Law TL and Noise Reduction -- it has zero influence on Estimated STC Rating or Estimated OITC Rating, since both of those come from total glass mass and a set of fixed bonuses rather than from any single frequency point. Outer Glass Thickness and Inner Glass Thickness contribute to total surface mass identically, so an equal thickness increase on either pane raises Estimated STC Rating by the same amount.

Air/ Gas Gap widens the STC bonus as the gap grows, but that bonus caps at 6 points and finishes climbing once the gap reaches roughly 20mm -- pushing the gap wider past that point adds nothing further in this calculator's model. Laminate Interlayer, once set above zero, adds a flat 4-point bonus representing the damping a PVB or acoustic interlayer provides between panes. These figures are simplified estimates for comparing glazing options, not certified NFRC or laboratory STC test results.