Axis

Sound level

decibel SPLdB SPL

Sound pressure level relative to 20 µPa: L = 20·log₁₀(p/20 µPa).

Dimension
pressure
Canonical signature
L^-1*M*T^-2
System
common
Exactness
Exact by definition

Definition record

How this unit is defined

Canonical base
1 dB SPL = 0.00002244036908603927 Pa
Conversion type
log
Historical notes
dB SPL is a pressure; dB(A) weighting is perceptual and not convertible.
Aliases
dBSPL, decibel sound pressure level, db spl

Same dimension

Related units

pound per square inchimperial uspsipascalsiPabarsi acceptedbarkilopound per square inchimperial uskpsimegapound per square inchimperial usMpsiquettapascalsiQParonnapascalsiRPayottapascalsiYPa

Common conversions

Every conversion routes through the canonical base of the dimension.

1 dB SPL = 0.00002244036908603927 Pa

Exact by definition relationship

10 dB SPL = 0.00006324555320336759 Pa

Exact by definition relationship