How to Use the Decibel Change Rate Calculator
If a noise reading rises from 60dB to 70dB, how much louder did it actually get? Because decibels are a logarithmic scale, the raw number difference doesn't reveal the real change. This calculator takes before and after decibel readings and computes the dB gap, the actual sound energy ratio, and the loudness change as perceived by human hearing.
Sound energy grows 10x for every 10dB increase (10^(ΔdB/10)), but human hearing is less sensitive — perceived loudness roughly doubles for every 10dB increase (2^(ΔdB/10)). So a 10dB rise means 10x the energy but only about 2x the perceived loudness. Understanding this gap helps you predict how noticeable a noise complaint or soundproofing improvement will actually feel.
Frequently Asked Questions
Decibels are a logarithmic scale, so the numeric difference doesn't directly represent the actual sound energy difference. A 10dB gap means 10x the energy.
Human hearing doesn't perceive double the energy as double the loudness — loudness roughly doubles for every 10dB increase.
A 3dB difference is barely noticeable, while a 10dB difference is clearly perceived as louder or quieter.