Convert sound level units like decibel, bel and neper for free.
Sound level measures sound intensity on a logarithmic, not linear, scale — meaning an increase of just 10 decibels represents, in practice, a sound ten times more intense in sound energy, not "10% louder" as intuition would suggest. This scale was developed at Bell Telephone Company's laboratories in the early 20th century, named in honour of Alexander Graham Bell, the inventor of the telephone. The logarithmic scale was chosen because the human ear itself perceives sound non-linearly — we're naturally more sensitive to small variations in quiet sounds than in already very loud ones. Occupational health bodies around the world, including in Brazil, set legal exposure limits based precisely on this scale: continuous exposure above 85 decibels for long periods is already considered a real risk of permanent hearing damage. This converter calculates with this logarithmic logic in mind, essential for audio and acoustics engineers designing spaces and equipment, occupational safety professionals assessing industrial noise exposure, musicians and music producers calibrating recording and performance equipment, and home theater and car audio technicians specifying audio system power and volume.
1 bel equals 10 decibels — the name "decibel" itself means one-tenth of a bel.
It is a logarithmic unit used mainly in telecommunications and electrical engineering, equivalent to approximately 8.686 decibels.
Because human perception of sound intensity is not linear — an increase of 10 dB is perceived as roughly double the loudness, not a simple proportional increase.