1. What is the Note Frequency Calculator?

The Note Frequency Calculator calculates the frequency of a musical note based on its distance in semitones from A4 (440 Hz). This is useful for musicians, audio engineers, and instrument tuners.

2. How Does the Calculator Work?

The calculator uses the equal temperament formula:

Where:

• \( f \) — Frequency in Hertz (Hz)
• \( n \) — Number of semitones from A4 (440 Hz)
• 440 — Reference frequency of A4
• 12 — Number of semitones in an octave

Explanation: The formula calculates the frequency of a note based on its position in the equal-tempered scale, where each semitone represents a ratio of \( 2^{1/12} \).

3. Importance of Note Frequency

Details: Accurate frequency calculation is essential for musical instrument tuning, audio production, sound design, and understanding musical theory.

4. Using the Calculator

Tips: Enter the number of semitones from A4 (positive for higher notes, negative for lower notes). For example, +12 semitones is A5 (880 Hz), -12 semitones is A3 (220 Hz).

5. Frequently Asked Questions (FAQ)

Q1: Why is A4 used as the reference?
A: A4 at 440 Hz is the international standard for musical pitch (concert pitch).

Q2: How do I find the semitone value for a specific note?
A: Each note in the chromatic scale is one semitone apart. For example, C5 is 3 semitones above A4.

Q3: What's the frequency ratio between semitones?
A: Each semitone represents a frequency ratio of \( 2^{1/12} \) (approximately 1.05946).

Q4: Does this work for non-equal temperaments?
A: No, this calculator assumes equal temperament. Other temperaments require different calculations.

Q5: How accurate is this calculation?
A: Mathematically precise for equal temperament, though real instruments may have slight variations.