// multi-utility computation suite · offline · instant · precise
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sci.Weber-Fechner-perception Calculator
Calculates perceived sensation magnitude using the Weber-Fechner law: S = k × log(I/I₀), where I₀ is the threshold stimulus intensity. Weber fraction ΔI/I is constant within a modality — for brightness, ΔI/I ≈ 0.015; for weight, ≈ 0.02; for audio intensity, ≈ 0.1 (every 10 dB doubles loudness).
Inputs
I0 Reference
Reference formula or conversion factor shown for context.
I Stimulus
Reference formula or conversion factor shown for context.
K Weber Fraction
Reference formula or conversion factor shown for context.
S0 Sensation Ref
Reference formula or conversion factor shown for context.
Results
just noticeable difference JND
The arithmetic difference between the two values.
difference detectable?
The arithmetic difference between the two values.
sensation change S (Fechner)
The value at the specified point or condition.
stimulus ratio I/I₀
The proportional relationship between two quantities.
Weber law: ΔI/I = k
Reference formula or conversion factor shown for context.