Bel to Decibel Conversion
Convert between Bel and Decibel quickly and accurately.
How to Convert Bel to Decibel
Conversion Formula
Example
Convert 15 B to dB:
Unit Information
Learn about the sound units you're converting between
Bel
B
Definition
The bel is a unit of sound level measurement representing the logarithm of the ratio of two power levels. It is the base unit for measuring sound intensity and amplitude ratios in logarithmic scale, providing a standardized way to express large ranges of sound levels in a compact form.
History/Origin
Named after Alexander Graham Bell, the inventor of the telephone, the bel was originally developed by Bell Telephone Laboratories in the 1920s to measure transmission losses in telephone lines. It became an international standard for measuring sound intensity ratios and signal levels in telecommunications and acoustics.
Current Use
The bel is primarily used as the reference unit for sound level measurements, though decibel is more commonly used in practice. It serves as the foundation for logarithmic sound measurement scales in acoustics, audio engineering, telecommunications, and scientific research where large dynamic ranges need to be expressed efficiently.
Multiplier
1
Offset
0
Decibel
dB
Definition
The decibel is a unit of sound level equal to one-tenth of a bel, making it more practical for everyday measurements. It represents the logarithm of the ratio of two power levels and is widely used for measuring sound intensity, power levels, and signal strength in various fields including acoustics, electronics, and telecommunications.
History/Origin
Derived from the bel unit with the metric prefix "deci-" meaning one-tenth, the decibel was introduced to provide a more convenient scale for practical sound measurements. It became the standard unit for expressing sound levels, signal-to-noise ratios, and transmission losses in electronic and acoustic systems.
Current Use
Decibels are extensively used in acoustics for measuring sound pressure levels, in electronics for signal strength and noise measurements, in telecommunications for signal quality assessment, and in audio engineering for volume control and sound mixing. They provide an intuitive scale where each 3 dB represents approximately a doubling of power.
Multiplier
0.1
Offset
0
Bel to Decibel Conversion Table
| Bel [B] | Decibel [dB] |
|---|---|
| 1 B | 10 dB |
| 10 B | 100 dB |
| 25 B | 250 dB |
| 50 B | 500 dB |
| 100 B | 1000 dB |
| 0 B | 0E+0 dB |
| -10 B | -100 dB |
| -40 B | -400 dB |
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