Combined Decibel Level
Add independent incoherent levels measured on the same basis.
Your numbers
Combined level
All levels must use the same reference, weighting and observation location. Coherent sources require phase information.
Scenario comparison
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Formula
Use L = 10log₁₀[Σ10^(Lᵢ/10)]. Lᵢ are independent incoherent levels in dB, sharing the same reference, weighting and location. The combined level L uses the same basis.
Add independent incoherent levels measured on the same basis.
Worked example
- Independent levels (dB)
- 60, 60
- Combined level
- 63.0102999566 dB
Scope and limitations
All levels must use the same reference, weighting and observation location. Coherent sources require phase information.
Inputs are checked for missing values and allowed ranges. A result outside the finite numeric range is not displayed. Rounding affects display, while the calculation uses the model’s numeric precision.
Check your units and assumptions before relying on a result. Changing a label does not convert a currency or physical unit.
Formula version: e4c192d9e0f2 · Example checked: