If you need a verified conversion for a specific product without a spectrum, contact the manufacturer for their AMCA 320-11 or ISO 10302 test report. Alternatively, hire an accredited acoustical testing lab to perform a one-hour verification measurement. The cost (typically $500–$1,500) is trivial compared to the liability of a failed noise compliance test.
Because Sones are linear and dBA is logarithmic, the relationship isn't a simple 1:1 ratio. The standard formula used by acoustic engineers to convert Sones to dBA is: Common Reference Points
| Sone Rating | Perceived Loudness | Example Environment / Appliance | | :--- | :--- | :--- | | | Near silent | Ultra-quiet fan / Library whisper | | 1.0 sone | Quiet | A quiet refrigerator / Very quiet room | | 1.5 sones | Quiet | A modern, quiet bathroom exhaust fan | | 4.0 sones | Moderate to loud | A normal dishwasher or vacuum cleaner | | 6.5 sones | Loud | A powerful range hood on high setting | | 8.0 sones | Loud | Normal conversation or background noise |
This table is verified for 60 Hz AC motors operating in free-air conditions at 1-meter distance, hemisphere.
This applies if you are documenting the noise levels of a product (like a ventilation fan or appliance) for official certification. In this context, measure subjective loudness, while dBA measures objective sound pressure.
For both sones and decibels, smaller numbers mean a quieter product.
(rooms that absorb all sound reflections). Manufacturers like Broan-NuTone
If you need a verified conversion for a specific product without a spectrum, contact the manufacturer for their AMCA 320-11 or ISO 10302 test report. Alternatively, hire an accredited acoustical testing lab to perform a one-hour verification measurement. The cost (typically $500–$1,500) is trivial compared to the liability of a failed noise compliance test.
Because Sones are linear and dBA is logarithmic, the relationship isn't a simple 1:1 ratio. The standard formula used by acoustic engineers to convert Sones to dBA is: Common Reference Points
| Sone Rating | Perceived Loudness | Example Environment / Appliance | | :--- | :--- | :--- | | | Near silent | Ultra-quiet fan / Library whisper | | 1.0 sone | Quiet | A quiet refrigerator / Very quiet room | | 1.5 sones | Quiet | A modern, quiet bathroom exhaust fan | | 4.0 sones | Moderate to loud | A normal dishwasher or vacuum cleaner | | 6.5 sones | Loud | A powerful range hood on high setting | | 8.0 sones | Loud | Normal conversation or background noise |
This table is verified for 60 Hz AC motors operating in free-air conditions at 1-meter distance, hemisphere.
This applies if you are documenting the noise levels of a product (like a ventilation fan or appliance) for official certification. In this context, measure subjective loudness, while dBA measures objective sound pressure.
For both sones and decibels, smaller numbers mean a quieter product.
(rooms that absorb all sound reflections). Manufacturers like Broan-NuTone
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