Calculate the sound pressure level (SPL) in decibels from the root mean square pressure. SPL is the standard measure used in acoustics and noise assessment.
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Root mean square acoustic pressure
Threshold of hearing: 20 μPa = 2×10⁻⁵ Pa (default)
How this calculator works
Sound pressure level equals 20 times the base-10 logarithm of RMS pressure divided by the reference pressure p₀ = 20 μPa. Uses 20 log because pressure is an amplitude quantity.
Common questions about this calculator
These calculators are for educational and informational purposes only. While we strive for accuracy, results should be verified for critical applications. Always consult authoritative sources for engineering or scientific work.
