// multi-utility computation suite · offline · instant · precise
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music.decibel-combining Calculator
Calculates the combined SPL from multiple sound sources by adding power in the logarithmic dB scale rather than linearly. Two identical 90 dB sources combine to 93 dB, not 180 dB — a result that surprises most people the first time.
Inputs
Source1 Db
Reference formula or conversion factor shown for context.
Source2 Db
Reference formula or conversion factor shown for context.
Source3 Db
Reference formula or conversion factor shown for context.
Distance Ratio
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Results
combined SPL (dB)
Sample size or count used in the calculation.
inverse square loss at
The decrease or degradation from the baseline.
SPL at
The value at the specified point or condition.
equal sources double
Reference formula or conversion factor shown for context.
rule
Reference formula or conversion factor shown for context.
OSHA 8hr limit
Reference formula or conversion factor shown for context.