HVAC noise level combination calculator

Calculate combined sound level and increase above loudest source with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use combined sound level and increase above loudest source to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Independent sound levels (dB)
50,55,60
Combined sound level (dB)
61.511331
Increase above loudest source (dB)
1.511331

Try another scenario

Independent sound levels (dB)
[51, 55, 60]
Combined sound level (dB)
61.590015
Increase above loudest source (dB)
1.590015
Calculation method

Calculation method

Combined sound level (dB)

Logarithmic energy sum of mutually uncorrelated sound levels with the same weighting and observation point.

Increase above loudest source (dB)

Logarithmic energy sum of mutually uncorrelated sound levels with the same weighting and observation point.

Symbols and units
a
Independent sound levels (dB)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • User-supplied measurements and assumptions; Logarithmic energy sum of mutually uncorrelated sound levels with the same weighting and observation point. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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