DECIBEL (dB) CONVERTER
converter is a online tool for decibel - ratio conversion, multiplication of
dB value by a number and addition and subtraction operations of values in dB.
Formulas for dB calculations such as decibel field ratio calculation, decibel
power ratio calculation, adding decibels, subtracting decibels and
multiplication of decibel by a number are given in the "List of Equations"
section of this page.
Note: Use dot "." as decimal separator.
Decibel (dB): Decibel is a unit used to express relative difference in power
or intensity, usually between two acoustic or electric signals, equal to ten
times the common logarithm of the ratio of the two levels.
Examples to power quantities: Sound power measurements, power spectral
density random vibration.
Examples to field quantities: Voltage, displacement, velocity,
acceleration, force, sound pressure, strain.
Reference acoustic sound pressure level dB(SPL) : The lowest sound pressure which is usually
considered the threshold of human hearing (at 1 kHz) is approximately 2*10-5Pa
List of Equations:
The power relationship in dB
The field relationship in dB
Multiplication by a number n for power relationship
Multiplication by a number n for field relationship
Addition of dB
Subtraction of dB
If P is greater than P0 then ratio is positive; if P is less than P0 then ratio
P is the measured power and P0 is the
A is the measured amplitude and A0 is
the reference amplitude.
For addition and subtraction operation, LA ≥ LB
condition shall be met.