Look up the exact frequency in hertz of any musical note. Choose a note name from C to B, add a sharp if you need one, pick the octave and this tool returns the pitch using standard equal temperament with A4 fixed at 440 Hz. The formula multiplies 440 by two raised to the number of semitones away from A4 divided by twelve, which is the same math every synthesizer and tuner uses. You can also change the reference pitch if you tune to 432 Hz, 442 Hz or another standard, and every note shifts with it. This is handy for setting up oscillators, checking a tuner, matching a drone, or teaching how octaves double in frequency. The MIDI note number for the selected pitch is shown too, so it drops straight into a sequencer.
It uses equal temperament with A4 tuned to 440 Hz as the reference pitch.
Each semitone away from A4 multiplies or divides the frequency by the twelfth root of two, so every note has an exact Hz value.
Yes, pick a note name and octave and it returns the exact pitch in Hz for that specific note.
Look up the exact frequency in hertz of any musical note. Choose a note name from C to B, add a sharp if you need one, pick the octave and this tool returns the pitch using standard equal temperament with A4 fixed at 440 Hz.
Yes. Note Frequency Calculator is completely free, with no sign-up and no usage limits.
Yes. Note Frequency Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Note Frequency Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.