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tool.decibel-spl-calculator Calculator
Calculates Sound Pressure Level (SPL) in dB from acoustic power or intensity, and adds multiple sources using logarithmic summation. Doubling the number of identical sound sources adds only 3 dB — the most counter-intuitive fact in acoustics.
Inputs
Sound Intensity W M2
Reference formula or conversion factor shown for context.
Reference Intensity
Reference formula or conversion factor shown for context.
Distance M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Source Power W
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Results
SPL from intensity (dB)
Sample size or count used in the calculation.
SWL sound power level (dB)
The measured or computed level on the applicable scale.
SPL at
The value at the specified point or condition.
SPL = 10·log₁₀(I/I₀)
Reference formula or conversion factor shown for context.