Sound Pressure Level (SPL) Calculator
Calculate sound pressure level in decibels (dB SPL) from acoustic pressure in Pascals using the standard reference pressure.
How to Use the SPL Calculator
- Enter the RMS sound pressure in Pascals (Pa).
- Click Calculate to get the SPL in dB and a perception category.
- Use a calibrated microphone or sound level meter to measure sound pressure accurately.
Casi d'Uso
- •Acoustic engineering and room acoustics analysis.
- •Noise control in industrial and occupational settings.
- •Converting microphone output to decibels for audio work.
Formula
SPL = 20 × log₁₀(p / p₀), where p is the RMS sound pressure (Pa) and p₀ = 20 × 10⁻⁶ Pa (threshold of hearing).
Domande Frequenti
What is sound pressure level?
SPL is a logarithmic measure of the effective sound pressure relative to the threshold of human hearing (20 μPa). It is expressed in decibels (dB).
What dB level is dangerous to hearing?
Prolonged exposure above 85 dB can cause permanent hearing damage. Levels above 130 dB cause immediate pain; above 140 dB risk instant hearing loss.
Is this calculator free?
Yes, all OhMyCalc calculators are completely free to use.