// multi-utility computation suite · offline · instant · precise
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sci.equal-temperament-frequency Calculator
Calculates note frequencies in equal temperament tuning: f_n = 440 × 2^((n−49)/12) Hz, where n is the piano key number. Concert A₄ = 440 Hz is the international tuning reference — each semitone is a frequency ratio of 2^(1/12) ≈ 1.05946.
Inputs
Reference Frequency Hz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Semitones From Reference
Reference formula or conversion factor shown for context.
Harmonic
Reference formula or conversion factor shown for context.
Results
frequency (Hz)
Sample size or count used in the calculation.
note name (approx)
Supplementary information explaining an assumption, caveat, or important context for interpreting the result.