How do I convert dB to Pascals?

p = p_ref × 10^(SPL/20), where p_ref = 20 μPa (= 2×10⁻⁵ Pa), the threshold of hearing.

What is the reference pressure for dB SPL?

The reference sound pressure is 20 μPa (micropascals) or 2×10⁻⁵ Pa, corresponding to the approximate threshold of human hearing at 1 kHz.

A-weighting adjusts measured sound levels to approximate human hearing sensitivity. It reduces low ( 6 kHz) frequencies. dBA is the A-weighted unit. Because the correction is frequency-dependent, a single dB(A) value cannot be converted to sound pressure in Pa without knowing the frequency spectrum — this converter works with unweighted dB SPL only.

0 dB SPL corresponds to a pressure of 20 μPa — the approximate threshold of human hearing. It is not silence, but the quietest sound most people can detect.

What is the pain threshold in dB?

The pain threshold is approximately 130–140 dB SPL, corresponding to about 63–200 Pa of sound pressure.

ಉಚಿತ ಎಂಜಿನಿಯರಿಂಗ್ ಸಾಧನ #216

Sound Level Converter

Convert between unweighted sound pressure level (dB SPL) and sound pressure (Pa). Enter a value in either unit and get an instant conversion. Note: A-weighted levels in dB(A) are not directly convertible to Pa.

SPL = 20·log₁₀(p/p₀)dB SPL ↔ PaUnweighted

Results

ಧ್ವನಿ ಒತ್ತಡ

—

dB SPL

—

ಧ್ವನಿ ಒತ್ತಡ

—

ಶಬ್ದ ಒತ್ತಡ ಮಟ್ಟ

ಇಲ್ಲಿ p₀ = 20 μPa = 2 × 10⁻⁵ Pa (ಶ್ರವಣದ ಮಿತಿ)

A Note on dB(A)

This converter works with unweighted sound pressure levels (dB SPL). An A-weighted level, dB(A), applies a frequency-dependent correction curve that approximates human hearing sensitivity. Because the correction varies with frequency, a single dB(A) value cannot be converted to sound pressure in Pa without knowing the frequency spectrum of the sound. Do not enter dB(A) readings into this tool expecting an exact pressure value.

ಸಾಮಾನ್ಯ ಧ್ವನಿ ಮಟ್ಟಗಳು

ಮಟ್ಟ (dB)	ಒತ್ತಡ (Pa)	ಉದಾಹರಣೆ
0	0.00002	ಶ್ರವಣ ಮಿತಿ
30	0.00063	ನಿಶ್ಶಬ್ದ ಕೊಠಡಿ
60	0.02	ಸಾಮಾನ್ಯ ಸಂವಾದ
85	0.36	ಭಾರೀ ಸಂಚಾರ
94	1.0	1 ಪಾಸ್ಕಲ್ ಉಲ್ಲೇಖ
120	20.0	ನೋವಿನ ಮಿತಿ
140	200.0	ಜೆಟ್ ಎಂಜಿನ್ (ಹತ್ತಿರ)