Music Note Frequency Converter
Connect musical notes to numbers. Enter a note name or a frequency to see its exact value in Hz, the matching musical note and the wavelength — handy for tuning instruments, mixing audio and learning music theory.
How to use
- Enter your value in the boxes above or select an option.
- The result updates live — you do not need to press any button.
- Change a value or unit and the new result appears on its own.
Tips
- A4 is the standard reference at 440 Hz; every octave up doubles the frequency.
- Each semitone step multiplies the frequency by about 1.0595 — the twelfth root of two.
- Wavelength shortens as frequency rises, which is why smaller instruments sound higher.
- Use the converter to check tuning: if your tuner reads 442 Hz on A, you are slightly sharp.
Note
Equal temperament formula: f = A4 x 2^((n - 69) / 12), where n is the MIDI note number. Wavelength is calculated with the speed of sound in air at 343 m/s.
Frequently Asked Questions (FAQ)
What does the music note frequency converter do?
It links a musical note name with its frequency in Hz. You also see the matching note for any frequency, plus the wavelength in air.
Can I convert both ways?
Yes. Pick a note and octave, or type a frequency directly — the tool shows the matching note and frequency instantly.
What reference pitch does the converter use?
A4 at 440 Hz by default, using the equal temperament formula. You can change the A4 reference if your instrument is tuned differently, and wavelength is calculated with the speed of sound at 343 m/s.
How do I check if my instrument is in tune?
Type the reading from your tuner into the frequency box. The tool shows the closest note and how many cents sharp or flat you are.