Convert Bel to Decibel
Live bidirectional calculator for Bels (B) and Decibels (dB) with verified formula and conversion charts.
Sound Level3 units
How the Calculation Works (Linear Scaling)
Since 1 Bel = 10 Decibels, multiply the value in Bels by 10.
Bel to Decibel Conversion Table
Precomputed values for quick reference and printing.
| Bel | Decibel |
|---|---|
| 1 B | 10 dB |
| 2 B | 20 dB |
| 3 B | 30 dB |
| 4 B | 40 dB |
| 5 B | 50 dB |
| 6 B | 60 dB |
| 7 B | 70 dB |
| 8 B | 80 dB |
| 9 B | 90 dB |
| 10 B | 100 dB |
| 15 B | 150 dB |
| 20 B | 200 dB |
| 25 B | 250 dB |
| 30 B | 300 dB |
| 40 B | 400 dB |
| 50 B | 500 dB |
| 75 B | 750 dB |
| 100 B | 1000 dB |
| Decibel | Bel |
|---|---|
| 1 dB | 0.1 B |
| 2 dB | 0.2 B |
| 3 dB | 0.3 B |
| 4 dB | 0.4 B |
| 5 dB | 0.5 B |
| 6 dB | 0.6 B |
| 7 dB | 0.7 B |
| 8 dB | 0.8 B |
| 9 dB | 0.9 B |
| 10 dB | 1 B |
| 15 dB | 1.5 B |
| 20 dB | 2 B |
| 25 dB | 2.5 B |
| 30 dB | 3 B |
| 40 dB | 4 B |
| 50 dB | 5 B |
| 75 dB | 7.5 B |
| 100 dB | 10 B |
๐ Standard Benchmark Reference Values
Standard tenfold logarithmic power ratio definition (1 B = 10 dB).
Exact RatioAbout Bel (B)
A dimensionless logarithmic level ratio unit defined as the base-10 logarithm of a power ratio (L = logโโ(P/Pโ)). In sound level measurement, 1 bel represents a tenfold change in power ratio.
History: Named in 1928 by Bell Telephone Laboratories in honor of Alexander Graham Bell (1847โ1922).
Common Uses: Telecommunications transmission line attenuation, computer fan acoustic noise power emission specifications.
About Decibel (dB)
One tenth of a bel (1 dB = 0.1 B). In acoustic measurements, sound level L (dB) = 10 logโโ(P/Pโ) = 20 logโโ(p/pโ) for root-power quantities.
History: Introduced alongside the Bel as a more practical, convenient scale where 1 dB represents roughly the smallest difference in acoustic loudness perceptible to the human ear.
Common Uses: Acoustic sound pressure levels (SPL), audiometry hearing tests, audio amplifier gain, loudspeaker sensitivity ratings.
โ Frequently Asked Questions
How many Decibels are in 1 Bel?
There are exactly 10 Decibels in 1 Bel (1 B = 10 dB).
What is the formula to convert Bel to Decibel?
The formula is: Decibel = Bel ร 10. Since 1 Bel = 10 Decibels, multiply the value in Bels by 10.
How do I convert 1 B to dB manually?
To convert 1 B to dB: apply the formula Decibel = Bel ร 10. Substituting gives: 1 ร 10 = 10 dB.