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sci.loudness-phon-sone Calculator
Converts sound pressure level and frequency to loudness in phons using ISO 226 equal-loudness contours, and phons to sones. A 60 dB tone at 1,000 Hz = 60 phon = 4 sone — a 10 dB SPL increase doubles loudness in sones but adds only 10 phons.
Inputs
Spl Db
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Frequency Hz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Phon Reference
Reference formula or conversion factor shown for context.
Results
sone value (from phon reference)
The computed numeric or monetary value.
loudness ratio (vs 60 phon ref)
The proportional relationship between two quantities.
doubling threshold
Sample size or count used in the calculation.
sone = 2^((phon-40)/10)
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).
phon scale
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).
ISO 226
Reference formula or conversion factor shown for context.