// multi-utility computation suite · offline · instant · precise
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│ computation suite │
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sci.psychoacoustic-loudness Calculator
Calculates loudness in phons and sones from sound pressure level at a given frequency, using equal-loudness contours. The ear is most sensitive at 3–4 kHz — a 40 dB tone at 1 kHz sounds equally loud as a 50 dB tone at 100 Hz; the phon scale normalises this frequency dependence.
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.
Results
A-weighted level (dB(A))
The computed weight (gravitational force) or mass.
loudness level (phons)
The measured or computed level on the applicable scale.
loudness (sones)
Sample size or count used in the calculation.
A-weighting correction
The computed weight (gravitational force) or mass.
phons ≈ dB(A) at 1kHz
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).