Math
Incoherent Sound Level Combiner
Combine same-reference sound levels by adding their incoherent intensity ratios stably.
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How to use Incoherent Sound Level Combiner
Total level is maximum level plus10log10(sum(10^((level−maximum)/10))). The maximum offset avoids overflowing large intensity ratios; matching reference and weighting are prerequisites.
- Enter same-reference sound levels (db).
- Choose the stated convention and check the units and supported model.
- Calculate, inspect the result, then copy or download it.
Good to know
- 1–1000 levels from−1000 to1000dB, same reference/weighting and incoherent independent-source model. No phase interference, hearing-exposure standard or acoustic certification.
- Runs locally. Text/JSON fields are capped at30,000 characters; stricter page-specific and numeric-string limits also apply. Numeric inputs are bounded to magnitude1e15 and nonzero magnitude at least1e-100 unless an exact-string mode states otherwise. Approximate summaries use12 significant digits; CSV numeric cells retain the complete stored value and potentially formula-like string cells gain a protective apostrophe; unsupported, non-finite or detected underflow states return an error.
Common questions
Can I simply add two dB numbers?
No. In this model the underlying intensity ratios add, so two equal80dB levels produce approximately83.0103dB.
Is the input uploaded or saved?
No. The tool calculates inside this browser tab and provides a local download; it does not persist your input.
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