One sone is defined as the loudness of a 1 kHz tone at 40 dB SPL (sound pressure level).
And if you need to convert one to the other — remember it’s an at best. Your ears are the ultimate judge. Want a quick reference? For most common household fans and vents: 1 sone ≈ 40 dB, 2 sones ≈ 50 dB, 4 sones ≈ 60 dB, but expect variation of ±5 dB depending on pitch. sones to db
If you’ve ever shopped for a range hood, a bathroom exhaust fan, or a leaf blower, you’ve likely seen two different units for noise: sones and decibels (dB) . At first glance, both seem to measure "how loud" something is. But they are not the same, and you cannot simply convert between them with a single formula. One sone is defined as the loudness of
A sound judged to be twice as loud is 2 sones. A sound half as loud is 0.5 sones. This makes sones intuitive for product design and consumer comparisons. Want a quick reference
