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Note Frequency Calculator

Find a note's frequency from semitones above A4.

Calculated Output

Frequency (Hz) 523.25

Formula: f = A4 × 2^(semitones ÷ 12)

Step-by-Step Breakdown

1. Values used:

2. Semitones from A4 = 3

3. A4 tuning = 440 Hz

5. Frequency = 523.25Hz

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The math behind it

frequency = A4 × 2^(semitones ÷ 12). Each octave (12 semitones) doubles the frequency.

+3 semitones from A4 → C5 ≈ 523.25 Hz.

Negative?

Lower notes — −12 is one octave down.