How to use the sound pressure level calculator
Convert a sound pressure in pascals into decibels relative to the threshold of hearing. Enter sound pressure in the field above; the sound pressure level, pressure relative to threshold of hearing are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “sound pressure to dB”, “SPL calculator”, “decibel from pascal”, “calculate sound pressure level”, “find sound pressure level”.
Formula
Variables
- p — Sound pressure (Pa)
Worked example
With sound pressure = 0.02 Pa, the calculator gives sound pressure level ≈ 60 dB; pressure relative to threshold of hearing ≈ 1,000 ×.
Frequently asked questions
What is the sound pressure level calculator used for?
Convert a sound pressure in pascals into decibels relative to the threshold of hearing. It helps with questions such as “sound pressure to dB”, “SPL calculator”, “decibel from pascal”.
What is the formula for the sound pressure level calculation?
Sound pressure level (dB) = 20 × log10(p / 0.00002). Pressure relative to threshold of hearing (×) = p / 0.00002. Here p is sound pressure (Pa).
What inputs do I need for the sound pressure level calculator?
You need sound pressure in Pa. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the sound pressure level calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the sound pressure level result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.