dB calculator

Sum sound sources, convert power/amplitude ratios to dB, and predict level at a new distance.

Add independent sound levels, convert watts to amplifier dB gain, and estimate level drop with distance.

dB sums assume uncorrelated sources (10·log₁₀Σ10^(L/10)). Runs in this browser.

How to use

  1. Pick an operation.
  2. Enter levels, a ratio, or distances.
  3. Read the dB result.

What it supports

Incoherent sum of up to 64 sources (10·log10 of energy sum), power ratio 10·log10, amplitude ratio 20·log10, inverse-square distance law for free-field point sources. Room reflections and ground effects are not modeled.

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